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Joeri van Leeuwen (ASTRON)15/05/2023, 12:55
Fast radio bursts (FRBs) are so crazily bright that they must be powered by uniquely energetic emission mechanisms. Identifying their physical nature requires good localisation of more detections, and broadband studies enabled by real-time telescope combinations. I will present the results from the Apertif FRB survey (ALERT) that ran 2019-2022. ALERT performed wide-field, fully coherent,...
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Pragya Chawla (University of Amsterdam)15/05/2023, 13:10
Fast radio bursts (FRBs) are extragalactic radio transients of microsecond to millisecond duration, whose physical origin is largely unknown. Some FRBs are known to repeat, which rules out cataclysmic progenitor models for these sources. Repeating FRBs exhibit significantly different temporal widths and bandwidths as compared to the non-repeating sources. A potential explanation for these...
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Antonia Rowlinson (UvA & ASTRON)15/05/2023, 13:25
The mergers of two neutron stars are exceptional multi-messenger events including short gamma-ray burst (GRB), gravitational wave and kilonova/afterglow emission. These events enable us to probe fundamental physics in one of the most extreme environments in the Universe. A key outstanding question is the remnant’s nature: with its expected mass and rapid spin, it could either be a black hole...
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Omar Ould-Boukattine (ASTRON)15/05/2023, 13:40
Fast radio bursts (FRBs) are enigmatic millisecond-duration radio flashes with an extragalactic origin. FRBs sources can be divided into two populations: repeating and apparently non-repeating sources. The burst energy distribution from repeating FRB sources is an important diagnostic tool that can be used to better understand the emission process, cosmological applications, and the potential...
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Floris van der Tak (SRON / Kapteyn)15/05/2023, 13:55Contributed talk
The current climate crisis has led to UN and EU regulations to reduce greenhouse gas emissions by 55% in 2030. Astronomers should lead this effort by example, as they are aware of the lack of a Planet B to live on.
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In the Netherlands, the RvdA installed a working group to monitor and improve the sustainability of Dutch astronomy, including outreach & communication on this topic. Our kickoff... -
Roland Timmerman (Leiden Observatory)15/05/2023, 14:10
As the intracluster medium (ICM) in galaxy clusters cools through the emission of X-ray radiation, it sinks down toward the central galaxy where it fuels the AGN. This AGN subsequently emits radio-mode feedback in the form of powerful jets of relativistic plasma which re-energize the ICM, completing the feedback cycle. Measurements of the energy injected by radio-mode feedback into the cluster...
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Abha Khakurdikar (IMAPP, Radboud University)15/05/2023, 15:00
Neutral particles play a crucial role in understanding the origin of ultra-high energy cosmic rays. Neutrinos keep the directional information as they are not deviated by the magnetic fields and would point back to the sources. In the 1.0 EeV energy range, neutrinos are expected to be produced in the same sources where cosmic rays are thought to be accelerated. The Radio Detector of the Pierre...
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Martijn Wilhelm (Leiden Observatory)15/05/2023, 15:00
Most stars form in stellar clusters that dissolve into the galactic field on timescales of tens to hundreds of millions of years. Planet formation takes place in a protoplanetary disk around young stars, disks that have typical lifetimes of a few millions years. The process of planet formation thus typically takes place in a stellar cluster environment. Understanding the impact of this...
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Paula Cáceres-Burgos (University of Groningen)15/05/2023, 15:15
Active Galactic Nuclei (AGN) are intrinsically variable sources. The observed variability in the optical can be explained as the sum of the reprocessing of very fast variations in the far UV or X-rays, and intrinsic variability from the accretion disk. Considering only reprocessing, which most likely corresponds to the fastest varying component, we can associate the shortest timescale of...
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Sanne Bloot (ASTRON / Kapteyn Astronomical Institute)15/05/2023, 15:15
A key question in stellar astronomy is whether there are habitable planets around stars other than our Sun. An important factor in determining this is stellar activity, as stellar eruptions have direct impact on the atmosphere of an exoplanet. Radio emission, especially with a high degree of circular polarization, can provide a direct measurement of the magnetic field and the plasma properties...
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Anne Inkenhaag (Radboud University)15/05/2023, 15:30
AT2018cow is a well studied fast blue optical transient. Dispite a plethora of data, there is no consensus on the nature of the event. We use HST data between two and four years after the event to investigate the environment of this transient. Surprisingly there is still transient emission detected at the location of AT2018cow in this time period. This late time emission resembles emission...
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Nicolas Crouzet (Leiden Observatory)15/05/2023, 15:30
JWST's science operations began in July 2022 after a successful launch and six months of commissioning. NOVA played a major role in the development of the Mid-Infrared Instrument (MIRI), in particular in its Medium Resolution Spectrometer (MRS). MIRI is the only instrument that covers wavelengths beyond 5 microns and is used to investigate a wide variety of objects, from galaxies to star...
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Dr Serena Vinciguerra (University of Amsterdam)15/05/2023, 15:45
In the last few years, the NICER collaboration has provided mass and radius inferences, via pulse profile modeling, for two pulsars: PSR J0030+0451 and PSR J0740+6620. Given the importance of these results for constraining the equation of state of dense nuclear matter, it is crucial to validate them and test their robustness. We therefore explore the reliability of these results and their...
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Kevin Lange (University of Amsterdam)15/05/2023, 15:45
The infrared signals of polycyclic aromatic hydrocarbons (PAHs) have been detected in numerous circumstellar discs. PAHs contribute to the heating of the disc's photosphere through efficient UV absorption and are crucial for disc evaporation models. Despite a correlation between effective stellar temperature and low PAH detection rates, the diversity of PAH detections at similar stellar...
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Danté Hewitt (University of Amsterdam)15/05/2023, 16:00
Fast Radio Bursts are millisecond duration, extragalactic, coherent flashes of radio emission. Some repeating fast radio bursts are exceptionally more active than others. FRB 20220912A was discovered in the last quarter of 2022 as it entered an intense active period. During this time, we detected many bursts as part of our repeating FRB monitoring campaign on the Nançay Radio Telescope, ECLAT...
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Aida Ahmadi (Leiden University)15/05/2023, 16:00
There is growing consensus that the formation of high-mass stars proceeds through disk accretion, similar to that of lower mass stars. To this end, we have undertaken a large observational program (CORE) making use of interferometric observations from the NOrthern Extended Millimetre Array (NOEMA) for a sample of 20 high-mass protostellar objects in the 1.3 millimetre wavelength regime...
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Ashley Chrimes (Radboud University)15/05/2023, 16:15
The majority of massive stars are born in binaries, and most unbind upon the first supernova. With the precise proper motion measurements of Gaia, it is possible to trace back the trajectory of stars in the vicinity of young supernova remnants and neutron stars to search for intersecting paths, and hence ejected companions. At present, only a handful of supernova runaway candidates are known,...
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Paul Boven (JIVE / Leiden University)15/05/2023, 16:15
A fraction of the nearby M dwarfs have detectable radio emission, which can be driven by several emission mechanisms. By observing the polarization, position and temporal behavior of this emission, we want to characterize it, and understand what mechanism is active in these radio stars.
We make use of the high astrometric accuracy and sensitivity available through the European VLBI Network....
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Floris van der Tak (SRON / Kapteyn)15/05/2023, 16:30
Today, ALMA and JWST are revolutionizing our views of star & planet formation and galaxy evolution with their unprecedented sensitivity and resolution at submillimeter and near/mid-IR wavelengths.
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However, many outstanding questions in these areas can only be answered with observations in the far-infrared domain, which generally need space-based instrumentation.
For planet formation, these... -
Jesse Vos (Radboud University)15/05/2023, 16:30
The flaring events observed in the Sagittarius A* supermassive black hole system can be attributed to the nonhomogeneous nature of the near-horizon accretion flow. Bright regions in this flow may be associated with density or temperature anisotropies, corresponding to so-called "bright spots" or "hot spots." Such orbiting features may explain observations at infrared wavelengths, as well as...
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Dany Vohl (Anton Pannekoek Institute for Astronomy, University of Amsterdam)15/05/2023, 16:45
The vast majority of extragalactic, compact continuum radio sources are associated with star formation or jets from (super)massive black holes and, as such, are more likely to be found in association with starburst galaxies or early type galaxies. Recently, two new populations of radio sources have been identified: (a) compact and persistent sources (PRS) associated with fast radio bursts...
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Mitchel Stoop (Anton Pannekoek Institute)15/05/2023, 16:45
Young massive clusters provide an ideal place to study the outcome of the star-formation process and the early dynamics of star clusters. With Gaia (E)DR3, we have studied the young massive clusters NGC 6611 in the Eagle Nebula (M16) and NGC 6618 in the Omega Nebula (M17). We determine membership and age of the cluster and search for stars that may have originated in the cluster. For NGC 6611,...
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Arjen Dijkstra (Tresoar, the Frisian Library, Literary Museum and Archive)15/05/2023, 20:00Contributed talk
At the end of the 18th century, amateur astronomer Eise Eisinga built the largest planetarium the world had ever seen. He placed it on the ceiling of the living room of his house in Franeker, in the northern part of the Netherlands. The project took him seven years of designing, building and constructing. By the time it was nearly finished, the news about the planetarium was widespread. He...
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Phil Diamond (SKAO)16/05/2023, 09:00Contributed talk
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Michiel van Haarlem (ASTRON)16/05/2023, 09:30Contributed talk
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Dr Joseph Callingham (ASTRON / Leiden University)16/05/2023, 09:40Contributed talk
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John Swinbank (ASTRON)16/05/2023, 09:50Contributed talk
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Jessica Dempsey (ASTRON)16/05/2023, 10:00Contributed talk
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Sera Markoff (University of Amsterdam)16/05/2023, 11:00Contributed talk
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Elizabeth A. K. Adams (ASTRON and Kapteyn Astronomical Institute)16/05/2023, 11:20
We are working on is a work climate survey of Dutch astronomy, under the direction of the NWO tafel voor astronomie and would like to update the community on this and other activities.
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Agnieszka Slowikowska (JIVE), Jessica Dempsey (ASTRON), Michael Wise (SRON, Netherlands Institute for Space Research; Anton Pannekoek Institute, University of Amsterdam), Michiel Rodenhuis (NOVA)16/05/2023, 11:35Contributed talk
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Nathalie Degenaar (Univ of Amsterdam)16/05/2023, 12:45Contributed talk
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16/05/2023, 13:05Contributed talk
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Paul Groot (Radboud University)16/05/2023, 13:30Contributed talk
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Peter Jonker (Nijmegen)16/05/2023, 13:45Contributed talk
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Scott Trager (Kapteyn Astronomical Institute, University of Groningen)16/05/2023, 14:00
WEAVE is the next-generation wide-field survey facility for the William Herschel Telescope (WHT). WEAVE will provide the instrument required for full scientific exploitation of the Gaia, LOFAR, and APERTIF surveys in the Northern Hemisphere. WEAVE is a multi-object and multi-integral-field-unit (IFU) facility utilizing a large, new 2-degree-diameter prime focus corrector at the WHT with a...
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Alexander Kutkin (ASTRON)16/05/2023, 14:15
New phased array feed for the Westerbork synthesis radio telescope, Apertif, provides L-band continuum radio images of the sky with angular resolution and sensitivity significantly better than the previous state-of-art northern survey, the NRAO VLA Sky Survey (NVSS). We continue processing Apertif data and releasing it for the community.
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In this work we mosaic together Apertif observations of... -
Jason Hessels (ASTRON)16/05/2023, 14:30
The LOw Frequency ARray (LOFAR) is in many respects the world’s largest and most sensitive low-frequency radio telescope. LOFAR stretches across Europe, from Ireland to Latvia, with a dense core and 38 stations distributed throughout the Netherlands, as well as 14 additional stations located in 8 partner countries. The pan-European array is called the International LOFAR Telescope (ILT). ...
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Aurora Simionescu (SRON, Netherlands Institute for Space Research; Leiden Observatory, Leiden University; Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo)16/05/2023, 14:45
The recommendations from the most recent Decadal Survey on Astronomy and Astrophysics include a NASA-led probe-class X-ray telescope to be launched in the 2030s. I will discuss the mission concepts that are being developed as a response, with particular focus on SRON’s contribution to the observatories that will address the priority area “Unveiling the Drivers of Galaxy Growth”. Galaxy...
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Frank Nuijens (ASTRON), Marieke Baan (Netherlands Research School for Astronomy (NOVA))16/05/2023, 15:30Contributed talk
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Barbara Šiljeg16/05/2023, 15:30
Low mass galaxies present great challenges for the current leading cosmological model $\Lambda$CDM. Hydrodynamical simulations based on $\Lambda$CDM have been unsuccessful in reproducing a number of galaxy properties at these scales, such as the diversity in the shapes of rotation curves as well as the scatter seen in scaling relations such as the baryonic Tully-Fisher (BTFR) and stellar...
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Matthieu Isidro (SKAO)16/05/2023, 15:35Contributed talk
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Guang Yang (Kapteyn Astronomical Institute)16/05/2023, 15:45
Mid-infrared observations are potentially powerful in identifying heavily obscured AGNs which have weak emission in other wavelengths. MIRI onboard JWST offers an excellent chance to perform such studies. We take advantage of the MIRI imaging data from the CEERS survey to investigate the AGN population in the distant universe. We estimate the source properties of MIRI-selected objects...
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Tana Joseph (Univ of Amsterdam)16/05/2023, 16:00Contributed talk
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Piyush Sharda (Leiden University)16/05/2023, 16:00
Thanks to integral field unit (IFU) spectroscopy, spatially-resolved metallicities have been measured in thousands of galaxies. This has built up a census of the baryonic cycle in local galaxies, which is crucial to understand how processes local to the interstellar medium (ISM) contribute to global trends in galaxies and influence the dynamics of the circumgalactic medium (CGM). JWST has...
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Erik Osinga (Leiden University)16/05/2023, 16:15
Merging galaxy clusters often host an impressive collection of diffuse radio sources. These diffuse synchrotron sources can be explained by a non-thermal pool of relativistic electrons accelerated by shocks and turbulence in the intracluster medium. The origin of the pool of relativistic electrons and details of the acceleration mechanisms in clusters are still open questions. Due to the often...
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Joanna Holt (NOVA)16/05/2023, 16:25Contributed talk
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Maxime Trebitsch (Kapteyn Astronomical Institute)16/05/2023, 16:30
Cosmic reionisation is one of the last major milestones in the global evolution of the Universe: by z~6, the hydrogen in the intergalactic medium becomes fully ionised by the radiation produced predominantly by massive stars in star-forming galaxies. Because of the increasing opacity of the IGM, completing the census of these ionising sources is still a major challenge on both the...
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Berta Margalef Bentabol (SRON - Netherlands Institute for Space Research)16/05/2023, 16:45
Galaxy mergers are one of the most violent processes and play a crucial role in galaxy evolution. However, the relative importance of mergers in mass growth and evolutionary events like AGN activity is not understood in detail. One of the main reasons is that mergers are difficult to identify with traditional methods and, in addition to being rare events, lead to incomplete and unreliable...
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Marieke Baan (Netherlands Research School for Astronomy (NOVA))16/05/2023, 16:50Contributed talk
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Joey Braspenning (Leiden Observatory)16/05/2023, 17:00
We use FLAMINGO, the biggest full hydro cosmological simulation ever, to study the most massive objects in the universe and do a direct comparison with observations. FLAMINGO hosts many thousands of massive clusters, in their full cosmological environment, making it an ideal testing ground to do a statistically relevant comparison with observations. Using a new forward modelling pipeline,...
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Marieke Baan (Netherlands Research School for Astronomy (NOVA))16/05/2023, 17:10Contributed talk
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Akshara Viswanathan (Kapteyn Astronomical Institute, University of Groningen)16/05/2023, 17:15
Our Galactic halo hosts some of the most metal-poor stars. These are relics from the era of the smallest, earliest galaxies that merged into the Milky Way.
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However, finding many of these extremely metal-poor (EMP) stars is challenging because they are rare among the more metal-rich populations in the Galaxy. The staggering Gaia DR3 provides low-resolution spectrophotometry for about 220... -
Rafael Navarro (Kapteyn Astronomical Institute)17/05/2023, 09:00
Despite its crucial role in shaping our understanding of galaxy formation and evolution, the low mass end of the high redshift galaxy mass function has so far remained largely unknown. This is specially true for the high redshift universe, where even the deepest surveys have been unable to probe this elusive galaxy population.
To address this challenge, we leverage the powerful...
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Pratika Dayal (Kapteyn Institute, Groningen University)17/05/2023, 09:15
Galaxy formation in the first billion years mark a time of great upheaval in our cosmic history: the first sources of light in the Universe, these galaxies ended the 'cosmic dark ages' and produced the first photons that could break apart the hydrogen atoms suffusing all of space starting the process of cosmic reionization. At the forefront of astronomical research, the past few years have...
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Mathilde Bouvier (Leiden Observatory, Leiden University)17/05/2023, 09:30
Various feedback mechanisms, such as star formation, large-scale outflows, shocks or Active Galactic Nuclei, affect the shape and evolution of galaxies. Starburst galaxies, in particular, show exceptionally higher star-formation rates compared to regular galaxies (e.g. the Milky Way), indicating different physical conditions. Understanding how these physical conditions differ in starburst...
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Ivana van Leeuwen (Leiden Observatory)17/05/2023, 09:45
One of the most exciting frontiers in extragalactic astronomy is understanding how rapidly galaxies formed stars in the Early Universe. This involves us constraining the Star Formation Rate Density (SFRD) at z >~ 6. Given the much greater ease in surveying the z > 4 universe in the rest-UV, the SFRD at z > 4 is biased to the unobscured, less dusty sources. Recent work shows that the...
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Christopher Boettner (Kapteyn Astronomical Institute, University of Groningen)17/05/2023, 10:00
We present an empirical galaxy evolution model, investigating the co-evolution of dark matter halos, galaxies, and supermassive black holes using from z= 0 - 10. Our approach connects the evolution of dark matter structure with simple empirical prescriptions for baryonic processes, allowing us to reproduce key observations in the relationship between galaxies and their black holes.
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To... -
Marco Palla (Ghent University)17/05/2023, 10:15
In the literature, large amount of work has been devoted to the study of the build-up of metals and dust in disc galaxies. However, most of these analyses are based on global galactic properties. Therefore, spatially resolved studies are crucial to provide more detailed information on the evolution processes affecting these star forming galaxies.
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In this talk, I will present a spatially... -
Lucie Rowland (Leiden Observatory)17/05/2023, 11:00
Recent studies have revealed the existence of particularly massive galaxies within the first Gyr after the Big Bang. These findings push the limits of galaxy evolution models, but our understanding of the formation of such galaxies is limited due to a lack of sub-kpc resolution observations of bright, spectroscopically-confirmed targets.
The REBELS ALMA large program have observed [CII]...
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Julia Healy (ASTRON)17/05/2023, 11:15
How galaxies replenish their gas supply in order to sustain star formation, is a research topic of many of the new and upcoming neutral atomic hydrogen (HI) surveys on the SKA precursor instruments.
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I present recent deep HI observations of NGC 5068, an isolated nearby star-forming galaxy observed by MeerKAT as part of the MHONGOOSE survey. This survey is the deepest HI survey of nearby... -
Ben Wang (Leiden University)17/05/2023, 11:30
Understanding how supermassive black holes and their host galaxies co-evolve in the universe is an unsolved problem. In a classical “unified” model for active galactic nuclei (AGN), observers can detect unobscured (Type-1) AGNs,with broad emission lines and continuum, or obscured (Type-2) AGNs, with only narrow emission lines. Type-2 AGNs have been readily identified at low redshift (z<1)....
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Pranav Kukreti (Kapteyn Astronomical Institute, and ASTRON)17/05/2023, 11:45
Feedback from radio AGN has been observed in the form of jet driven gas outflows, which can affect the host galaxy’s evolution. Radio AGN are also known to have a life-cycle of activity. However it is still not completely clear how feedback evolves with the AGN life-cycle. In the first part of my talk, I will discuss our results from a study to investigate this with a sample of uniformly...
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Emanuele Greco (API - University of Amsterdam)17/05/2023, 12:00
X-ray emission from young supernova remnants (SNRs) is characterized by non-thermal radiation and is usually interpreted as synchrotron process. This type of emission is detected in regions close to the shock front and it is explained with the the diffusive shock acceleration (DSA) theory, which requires high magnetic turbulence. However, the current spectral models used to fit the data...
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Freek Temming (University of Amsterdam)17/05/2023, 12:15
Since the first detection by LIGO in 2015, gravitational-wave detectors observe mergers of black holes which formed in the low-metallicity, high-redshift Universe. A main uncertainty in our understanding of these mergers is the evolution of the progenitor stars of these black holes – stars more massive than ~20 solar masses. WC/WO stars are hot, post main-sequence stars with powerful winds...
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Pietro Zucca (ASTRON)17/05/2023, 12:30
Understanding and modelling the complex state of the Sun-solar wind-heliosphere system, requires a comprehensive set of multiwavelength observations. LOFAR has unique capabilities in the radio domain. Some examples of these include: a) the ability to take high-resolution solar dynamic spectra and radio images of the Sun; b) observing the ionospheric scintillation and the iterplanetary...
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Teymoor Saifollahi (Kapteyn Astronomical Institute)17/05/2023, 12:45
The serendipitous appearances of Near-Earth Objects (NEOs) in a subset of the millions of archival exposures of optical and near-infrared astronomical imaging surveys can improve our knowledge of the orbits and compositions of NEOs. We show how the data processing and data mining of such imaging archives can be exploited to identify new and known NEOs, leading to a re-assessment of the impact...
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Roelof de Jong (Leibniz-Institut für Astrophysik Potsdam (AIP))17/05/2023, 13:00Poster
4MOST is a new high-multiplex, wide-field spectroscopic survey facility under construction for ESO's 4m-VISTA telescope at Paranal, Chile. Its key specifications are: a large field of view of 4.4 square degrees, a high multiplex fibre positioner with 2436 science fibres, of which 1624 fibres go to two low-resolution spectrographs (R = λ/Δλ ~ 6500) and 812 fibres transfer light to the...
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Xinyu Zheng (Leiden Observatory)17/05/2023, 13:00Poster
Ionization plays a critical role in the gas dynamics of protoplanetary disks (PPDs), which is further related with disk evolution and planet formation. While non-thermal ionization mechanisms, such as X-rays and cosmic rays, dominate the bulk regions of PPDs, the innermost regions are characterized by high temperatures (>1000K) with thermal ionization of alkali species and dust thermionic...
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Hanneke Woudenberg17/05/2023, 13:00Poster
Stellar streams are promising tools to study the mass distribution of galaxies. In particular, they have been used to constrain the shape and mass of the Milky Way's dark matter halo. Narrow distant streams are commonly used to this end, but I will instead focus on the nearby Helmi Streams' stars with full 6D phase-space information. These streams, the remnants of an accreted dwarf galaxy, are...
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Antonio La Marca (SRON - Kapteyn Astronomical Institute)17/05/2023, 13:00Poster
Collisions and interactions between galaxies are thought to be crucial phases in their evolution and mass assembly process, elevating star formation activity and potentially fueling accretion onto the central supermassive black holes. In this study, we leverage the high spatial resolution and sensitivity of the Hyper Suprime Cam survey and the associated rich multi-wavelength data in the GAMA...
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Anna Juranova (SRON / Anton Pannekoek Institute)17/05/2023, 13:00Poster
The broad line region of active galactic nuclei, tightly connected to the central engine's activity, is still poorly understood. In this talk, we present an analysis of X-ray, UV and optical spectroscopic observations of the broad emission lines applied for the first time to a narrow-line Seyfert 1 (Juranova et al., to be subm.). For the panchromatic modelling of the broad-line emission, we...
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Stefanie Fijma17/05/2023, 13:00Poster
Studying the chemical composition of accretion discs in low-mass X-ray binaries (LMXBs) provides vital information about their formation and evolutionary history. This, in turn, touches on a range of key topics, such as the formation and physics of Type-Ia supernovae, the birth masses and growth of compact objects, and the physics of accretion. Ultraviolet spectroscopy is particularly suited...
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Fiorenzo Stoppa (Radboud University)17/05/2023, 13:00Poster
In astronomy, machine learning has succeeded in various tasks, such as source localization, classification, anomaly detection, and segmentation. However, feature regression remains an area with room for improvement.
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We aim to design a network that can accurately estimate sources’ features and their uncertainties from single-band image cutouts. The algorithm presented here,... -
Jeger Broxterman (Lorentz Institute / Leiden Observatory)17/05/2023, 13:00Poster
Next-generation weak gravitational lensing surveys, including Euclid, will be able to measure weak lensing signals with high statistical accuracy all the way into the regime probing the scales of non-linear collapse. To be able to exploit these measurements to the fullest extent and, in the end, most accurately determine the cosmology, we must have an accurate understanding of the baryonic...
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Turgay Caglar (Southern Methodist University)17/05/2023, 13:00Poster
We present two independent measurements of stellar velocity dispersions ( $\sigma_\mathrm{\star}$ ) from the Ca H K & Mg I region (388--555 nm) and the Calcium Triplet region (CaT, 835--875 nm) for 173 hard X-ray selected Type 1 AGNs from 105-month Swift-BAT catalog. We construct one of the largest samples of local Type 1 AGNs that have both single-epoch (SE), 'virial' black hole mass...
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Dr Katrien Uytterhoeven (NWO (Dutch Research Council))17/05/2023, 13:00Poster
Are you considering a career change and would you like to remain closely involved in scientific research but from a different perspective? Maybe working at NWO, the Dutch research council, is something for you! NWO welcomes new employees with a scientific background to facilitate the funding of outstanding research and to help define strategies for funding research. Become a programme...
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Georgia Mraz (University of Amsterdam)17/05/2023, 13:00Poster
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17/05/2023, 13:00Poster
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Tadafumi Matsuno (Kapteyn Astronomical Institute)17/05/2023, 13:00Poster
Galaxy mergers and accretions are a fundamental process in galaxy evolution. In the Milky Way, we can identify signatures of past galaxy accretion events as kinematic substructures, allowing us to characterize the property of each accreted galaxy and, potentially, its impact on the Milky Way's evolution. We here characterize the chemical properties of stars belonging to kinematic substructures...
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Mr Alessandro Angrilli Muglia (Kapteyn Astronomical Institute)17/05/2023, 13:00Poster
We present results obtained by the Isaac Newton Telescope Wide Field Camera in March and April 2023 as part of a graduate class from Rijksuniversiteit Groningen. We present results from projects designed by the master students including: strategies to obtain a chromosome map of the globular cluster GCL38, a method to potentially determine metallicities making use of photometry and...
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Ramon Navarro (NOVA)17/05/2023, 13:00Poster
This presentation shows the status of the construction of the Extremely Large Telescope. It addresses both the infrastructure (telescope and building), as well as the instrument suite.
Images and graphics show the assembly status of the Dome and Main Structure on site in Chile, and the development of the mirrors and optomechanical control systems. Key figures are presented. Contracts...
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León David Sosapanta Salas (University of Amsterdam)17/05/2023, 13:00Poster
Accretion is a fundamental astrophysical process, occurring across all scales of black hole mass. Despite its ubiquitous nature, the accretion process, alongside its connection to jet outflows, poses many fundamental questions. General Relativistic Magneto hydrodynamic (GRMHD) simulations are providing significant insights into the nature of black hole accretion and jet outflows. Following...
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Yuexin Zhang (Kapteyn)17/05/2023, 13:00Poster
GRS 1915+105 regularly shows type-C quasi-periodic oscillations (QPOs) in the power density spectrum, sometimes together with a broad bump at around 30-150 Hz. We study the power spectra of GRS 1915+105 with the Rossi X-ray Timing Explorer when the source was in the hard-intermediate state. We find that the rms amplitude of the bump depends strongly upon both the frequency of the type-C QPO...
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Chen Li (Leiden University)17/05/2023, 13:00Poster
The distance of the outflowing wind is poorly constrained due to lack of direct imaging observations, which limits our understanding of their kinetic power. One way is that once known the density of the ionized plasma, the distance can be derived from the ionization parameter which measured based on the ionization states. Here, applying a new time-dependent photoionization model, TPHO, in...
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Aleksandar Shulevski (ASTRON)17/05/2023, 13:00Poster
We present the discovery of an AGN remnant associated with the galaxy group Abell 1318. Using GMRT and APERTIF data, we derive its radiative age and disentangle its complex history, showing that galaxy groups can have (surprisingly) dynamic past.
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Maitrey Patel (Anton Pannekoek Institute, University of Amsterdam)17/05/2023, 13:00Poster
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Fernanda Roman Oliveira (Groningen)17/05/2023, 13:00Poster
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Eduardo Balbinot (Leiden and RUG)17/05/2023, 13:00Poster
ED-2 is a stellar stream identified in integrals of motion on the third Gaia data release. It forms a compact group in energy and angular momentum in a local sample (<3 kpc), and its stellar population resembles one of an old metal-poor simple stellar population. It forms a compact group in the R-z (or x-z) plane, showing a ribbon-like structure in the solar neighbourhood, crossing the Sun's...
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Noemi La Bella (Radboud University)17/05/2023, 13:00Poster
The Event Horizon Telescope (EHT) has recently published the first images of the supermassive black hole at the center of our Galaxy, Sagittarius A$^\ast$ (Sgr A$^\ast$ ). Imaging Sgr A$^\ast$ is plagued by two major challenges: variability on short (approximately minutes) timescales and interstellar scattering along our line of sight. While the scattering is well studied, the source...
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Thomas Callingham (Kapteyn Institute, University of Groningen)17/05/2023, 13:00Poster
The release of Gaia DR3 has substantially enriched our understanding of the current state of the Milky Way (MW), and its assembly history. A driving force behind this is the increase of stars with complete 6d phase space (positions and velocities) necessary for complex dynamical analysis, such as identifying stellar substructures in the MW's stellar halo. However, far more stars are still...
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Emma Dodd17/05/2023, 13:00Poster
Galaxies stellar haloes are known to build up through the accretion of smaller systems, with stars from a single merger being deposited onto similar orbits. Since orbits can be characterized by their integrals of motion such as energy or angular momenta, we can thus search for the stellar debris of past accretion events by looking for over-densities in integrals of motion space (IOM). Using...
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Hector Olivares (Radboud University)17/05/2023, 13:00Poster
Comparison of horizon-scale observations of Sgr A and M87 with numerical simulations has provided considerable insight in their interpretation. Most of these simulations are variations of the same physical scenario consisting of a rotation-supported torus seeded with poloidal magnetic fields. This setup has several well known limitations, most notably, it differs in important ways from what...
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Anna Bilous17/05/2023, 13:00Poster
For nearly six decades of pulsar radio astronomy virtually all observational data interpretation was based on a simplifying assumption that the external magnetic field of a neutron star is that of an inclined dipole. Dipole field model correctly predicts some of key properties of radio pulses, but on per-source basis the discrepancies are ubiquitous. Most recently, compelling evidence for a...
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Wouter van Zeist (Radboud University)17/05/2023, 13:00Poster
Using stellar models from BPASS population synthesis, we calculate the full GW spectrum of a stellar population, including all types of compact binaries as well as those with living stars. We use these results to look at the detectability of star clusters with LISA. We find at late times the dominant sources are WD–WD binaries, but surprisingly at earlier times we find a significant population...
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Wanga Mulaudzi (Anton Pannekoek Institute for Astronomy)17/05/2023, 13:00Poster
A key characteristic of some active galactic nuclei (AGN), such as radio galaxies, is that they possess powerful jets that can extend through or beyond their host galaxy. However, the exact mechanisms of their launch and their internal properties are still not well understood. In this talk, I will focus on Event Horizon Telescope (EHT) and multi-wavelength image and spectral observations of...
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Jelle Mes (Leiden Observatory)17/05/2023, 13:00Poster
Upcoming surveys such as the Legacy Survey of Space and Time (LSST) will image billions of galaxies to extract the faint weak lensing signal for cosmological parameter inference. A pressing issue is that 50% of the galaxies will be “blended”, where its projection on our detectors will overlap with other astronomical objects along the same line of sight. Without appropriate “deblending”...
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Iris de Ruiter (Anton Pannekoek Institute/University of Amsterdam)17/05/2023, 13:00Poster
We report low-frequency radio observations of the 2021 outburst of the recurrent nova RS Ophiuchi. These observations include the lowest frequency observations of this system to date. Detailed light curves are obtained by MeerKAT at 0.82 and 1.28 GHz and LOFAR at 54 and 154 MHz. These low-frequency detections allow us to put stringent constraints on the brightness temperature that clearly...
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Ecaterina Leonova (University of Amsterdam)17/05/2023, 13:00Poster
After the Dark Ages, when the universe was completely neutral, the first sources of light appeared, marking the beginning of the Epoch of Reionization (EoR). During this epoch, the first stars and galaxies formed, emitting intense radiation that ionized the surrounding neutral hydrogen gas, creating ionized regions in the intergalactic medium (IGM), which grew and overlapped, making our...
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Dane Kleiner (ASTRON)17/05/2023, 13:00Poster
I will present new results from two MeerKAT Large Survey Programs - The MeerKAT Fornax Survey (MFS) and MHONGOOSE. The exquisite combined sensitivity and resolution of the MeerKAT telescope has opened the door to exploring the realm of resolved, low column density (10^17 - 10^18 cm^-2) neutral hydrogen (HI) emission in a broad range of environments. In the Fornax cluster, we detect (and...
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Prof. Antonija Oklopčić (University of Amsterdam)17/05/2023, 13:00Poster
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Valentin Mauerhofer (Kapteyn Institute)17/05/2023, 13:00Poster
Recent observations of high redshift galaxies are unveiling unexpected properties of early galaxy-formation. Observations in both rest-frame ultraviolet with the James Webb Space Telescope and rest-frame far-infrared with the Atacama Large Millimeter Array suggest an early population of bright massive galaxy, with a significant dust-obscuration already at redshift 7. To better understand the...
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Jonas Bremer (Kapteyn Institute)17/05/2023, 13:00Poster
We couple the DELPHI framework for galaxy formation with a model for the escape of ionizing photons to study both its variability with galaxy assembly and the resulting key reionization sources. In this model, leakage either occurs through a fully ionized gas distribution (ionization bounded) or additionally through channels cleared of gas by supernova explosions (ionization bounded + holes)....
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Ms Leoni Janssen (University of Amsterdam)17/05/2023, 13:00Poster
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17/05/2023, 13:00Poster
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Lydia Stofanova (Leiden Observatory, SRON)17/05/2023, 13:00Poster
The physical properties of the faint and extremely tenuous plasma in the filaments of the cosmic web remain one of the biggest unknowns in our story of large-scale structure evolution. The most common techniques how to observe this medium are either in emission, or in absorption against very bright, point-like sources. In this talk I focus on the warm-hot intergalactic medium and present yet...
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Christian Groeneveld (Leiden Observatory)17/05/2023, 13:00Poster
The Decameter radio band (< 30 MHz) has been scarcily explored since the inception of radio astronomy, largely due to the perturbing effects of the ionosphere. However, the decameter wavelength band is an important part of the electromagnetic spectrum. In particular, decameter observations of radio halos in galaxy clusters will allow us to constrain the particle reaccerlation mechanisms...
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Michael Florian Wondrak17/05/2023, 13:00Poster
While from a classical perspective we think of vacuum as empty space, it is filled by virtual particles from a quantum perspective. In flat spacetimes, these virtual particles arise in pairs, exist for a short amount of time, and then re-annihilate. As a result, no real particles are created.
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In this talk, we show that real particles are created in curved spacetimes. This is because... -
Eduard Muslimov (NOVA-ASTRON)17/05/2023, 13:00Poster
Habitable Worlds Observatory is a next-generation space telescope started by NASA following the recommendation of the US astronomy decadal survey in 2021. It will combine the key features of LUVOIR-B and HabEx projects and promises to provide unprecedented capabilities for exoplanetary science and astrophysics. As a continuation of our study for LUVOIR-A project, we propose a European-led,...
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Maria Nowowiejska (Anton Pannekoek Instituut)17/05/2023, 13:00Poster
Polycyclic aromatic hydrocarbons (PAHs) are very stable molecules made of aromatic carbon rings. Their prominent infrared features were found in interstellar space, in asteroids, and are one form of carbon in circumstellar disks. Even though they are not the dominant form of carbon, these molecules can be easily observed making them an object of active research interest. Professor Carsten...
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Ewoud Wempe (Kapteyn Astronomical Institute)17/05/2023, 13:00Poster
Cosmological simulations have been used to understand the formation of structure in the ΛCDM paradigm on small and large scales. Most simulations start with unconstrained Gaussian initial conditions, and therefore generically do not produce good analogues of the Local Group at present day. While constrained simulations exist, these have difficulty in precisely satisfying all our observational...
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Cole Johnston (Radboud University)17/05/2023, 13:00Poster
In recent decades, numerous telescopes have been built to identify transients and periodic variables in the night sky. These telescopes have provided a boom in our understanding of the wide variety of transients and their progenitor systems in many astrophysical contexts. While the Northern hemisphere has enjoyed several dedicated telescopes observing both transient and periodic phenomena on...
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Casper Moltzer (Radboud University)17/05/2023, 13:00Poster
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Bjarni Pont (Radboud University Nijmegen)17/05/2023, 13:00Poster
The Auger Engineering Radio Array (AERA) is an array of $153$ radio antennas spanning an area of 17 km$^2$, currently the largest of its kind, that probes the nature of ultra-high energy cosmic rays at energies around the transition from Galactic to extragalactic origin. It measures the MHz radio emission of extensive air showers produced by cosmic rays hitting our atmosphere. The elemental...
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Mr Anwesh Majumder (Anton Pannekoek Institute, University of Amsterdam; SRON, Netherlands Institute for Space Research)17/05/2023, 13:00Poster
We develop a new technique to resolve small-scale structures in galaxy groups and clusters using XMM-MOS. This study takes advantage of the steep nature of the on-axis XMM PSF which encloses ~60% of the incident photon energy within 10 arcsec. Standard pipeline processing of XMM-MOS data yields images with 4 arcsec binning by default; however, images may be created with 1 arcsec bins to better...
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Orlin Koop (Kapteyn Astronomical Institute, Rijksuniversiteit Groningen)17/05/2023, 13:00Poster
Determining the circular velocity curve of a galaxy is a powerful tool for studying its overall shape. One can fit a potential and determine the dark matter distribution and density, or even the virial mass of the system.
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One way of determining the rotation curve is through Jeans equations (Eilers et al. 2019, Ou et al. 2023). However, when using Jeans equations one needs to assume... -
Di Wen (Kapteyn Astronomical Institute, University of Groningen)17/05/2023, 13:00Poster
Anomalous flux ratios between lensed images can provide a key test of the dark matter sub-halo population, and hence the properties of dark matter particles. However, the observed anomalous flux ratios at radio frequencies can also be the result of systematics associated with our lack of knowledge about the source structure, source variability, and propagation effects within the lensing...
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Christiaan Van Buchem (Leiden University)17/05/2023, 13:00Poster
Hot-rocky exoplanets with surface temperatures above 1500 K are thought to support magma oceans. The presence of these magma oceans offers a unique opportunity for inferring the interior composition of these planets through the characterization of their atmosphere. With hundreds of hot-rocky exoplanets discovered and a dozen of good targets for JWST characterisation, understanding the links...
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Yanling Chen17/05/2023, 13:00Poster
Previous XMM-Newton observations of Abell 222/223 reveal a large-scale filament connecting the clusters, which is further verified by weak-lensing data. This cluster pair is also implied to be pre-merger. Therefore this filament was claimed to represent relatively pristine warm-hot intergalactic gas, before being processed by the cluster's interaction.
We analyzed the Suzaku archival data...
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Ms Petra Awad (University of Groningen, Kapteyn Astronomical Institute, 9747 AD Groningen, The Netherlands)17/05/2023, 13:00Poster
The spatial distribution of matter on the mega-parsec scale of the Universe forms a complex and highly anisotropic pattern termed the Cosmic Web or the Large-Scale Structure. In the study of the Cosmic Web, several tools and methodologies have been developed to inspect the properties of its different environments i.e. clusters, filaments, walls, and voids. In this work, we show that the...
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zephyr penoyre (leiden observatory)17/05/2023, 13:00Poster
With Gaia we have a thousand-fold increase in the number of stars and the precision with which we can observe their motion, which allows us to see previously rare phenomena in great numbers and detail. Astrometric binaries are a fantastic example of this - around half of all stars are binaries and precise astrometry enables us to detect a large fraction of these, with periods from months to...
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Ana Monreal Ibero17/05/2023, 13:00Poster
Stellar feedback in high-redshift galaxies plays an important, if not dominant, role in the re-ionization epoch of the Universe. Because of their extreme star formation, very nearby Blue Compact Dwarf galaxies (BCDs) postulate as favorite local analogs where to carry out detailed studies to anchor our investigations on high-redshift galaxies. In this contribution, we will discuss recent...
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Evgenii Chaikin (Leiden Observatory)17/05/2023, 13:00Poster
Supernova (SN) feedback plays a fundamental role in galaxy evolution. However, modelling SN feedback in simulations of galaxy formation remains challenging because the simulations cannot resolve the scales on which SN feedback occurs. Therefore, SN feedback is generally implemented as a subgrid model that has a number of free parameters, which are calibrated such that the simulated galaxies...
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Shivani Bhandari (ASTRON)17/05/2023, 13:00Poster
Fast Radio Bursts (FRBs) are millisecond-duration transient sources of intense, coherent radiation originating in distant galaxies that are signposts of extreme astronomical environments. Telescopes all over the world are used to conduct searches for FRBs, localise them, and study their host galaxy and local environment. The European VLBI Network in particular is a prime instrument to study...
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Beatrix Curtis (University of Amsterdam)17/05/2023, 13:00Poster
Runaway stars (massive stars moving away from the star clusters where they were born at unusually high velocities) have been observed for more than half a century, yet the origins of these high velocities remain elusive to this day. One of the most prominent theories for the origins of runaway stars is the dynamical ejection scenario in which binaries are thought to dynamically interact with...
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Krishna Nivedita Gopinath (Radboud University)17/05/2023, 13:00Poster
High energy neutrinos(>10PeV) are integral to the multi-messenger astronomy and notoriously hard to detect. When a high energy neutrino interacts in ice, it produces a relativistic cascade of charged particles, which in turn leaves behind a plasma which can reflect radio waves. This is the concept of the Radar Echo Telescope (RET). But as a first step it's important to understand the method by...
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Amy Louca (Leiden Observatory)17/05/2023, 13:00Poster
The evolution of stars on grand time-scales affect their surroundings in many ways. Due to their intrinsic rotation, causing strong magnetic activity, they vary greatly in radiative activity in X-ray and ultraviolet (XUV) throughout their lifetime. Planets orbiting these stars close-in could, consequently, be affected by these drastic radiative changes. Close-in exoplanet atmospheres heat up...
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Célestin Herbe-George (Kapteyn Institute)17/05/2023, 13:00Poster
The high angular resolution and sensitivity of VLBI offers a unique tool to identify and study AGN and star-formation activity. Radio imaging across a large range of angular scales is needed to determine the role of black hole feedback and jet-induced star formation in galaxies. All-sky VLBI surveys can answer these questions and find rare radio sources, such as gravitational lenses. Despite...
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Zorry Belcheva (Leiden Observatory)17/05/2023, 13:00Poster
Supermassive black holes experience dynamical friction, a drag force caused by momentum exchange with the surrounding medium of stars, dark matter, and gas. In this study, we investigate dynamical friction on massive black holes in depth, including testing a commonly used analytic model based on Chandrasekhar's 1943 study. Our goal is to develop a functional subgrid model that can be...
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Aristomenis Yfantis (Radboud University)17/05/2023, 13:00Poster
Recent Event Horizon Telescope (EHT) observations of M87 and Sgr A have proven to be an insightful data set to probe the spacetime and physical conditions in accreting supermassive black hole systems. For this purpose an ad hoc and fixed, pre-computed library of ~60,000 model images for M87 and about 1,800,000 for Sgr A was used to sample black hole spin, magnetic flux on the horizon,...
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17/05/2023, 13:00Poster
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Iris Reitsma (API)17/05/2023, 13:00Poster
X-ray binaries, which are neutron stars or black holes accreting gas from a companion star, emit radiation across the electromagnetic spectrum. Whereas it is well established where their X-ray and radio emission originates, it is much less clear where their infrared emission comes from: is it coming from the cooler outer part of the disk, the companion star, a jet, or a hot flow? During my...
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Josephine Kerutt17/05/2023, 13:00Poster
It has become clear in recent years, that the most important contributors of the ionising Lyman continuum photons at the epoch of reionisation are star-forming galaxies. To better understand their properties, we look at a sample of Lyman alpha emitters (LAEs) from MUSE at intermediate redshifts z=3-6.7 and find 12 Lyman continuum leaker candidates (Kerutt et al. in prep.) in the Hubble Deep...
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Mr Simon van Eeden (University of Amsterdam)17/05/2023, 13:00Poster
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Ignacio del Moral Castro (Kapteyn Astronomical Institute)17/05/2023, 13:00Poster
Unveiling the mechanisms that trigger active galactic nuclei (AGN) is a badly understood problem, that is crucial for our understanding of the galaxy formation and evolution. While interactions and galaxy mergers are associated with the triggering of powerful AGN, less luminous AGN would be driven by secular processes (Treister et. al., 2012). Over the last few years, several observational...
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Michiel Brentjens (ASTRON)17/05/2023, 13:00Poster
At Leiden University's radio astronomy course, we observe the Milky Way using radio telescopes made of 5 litre paint cans, commercial Low Noise Amplifiers (LNAs) and Software Defined Radios (SDRs). Galactic neutral hydrogen can be detected on student's own laptops in mere seconds! This experiment involves the whole process from systems engineering, through signal processing, field experiments,...
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Piyush Sharda (Leiden University)17/05/2023, 13:00Poster
The characteristic mass that sets the peak of the stellar initial mass function (IMF) is closely linked to the thermodynamic behaviour of interstellar medium (ISM), which controls how gas fragments as it collapses under gravity. As the Universe has grown in metal abundance over cosmic time, this thermodynamic behaviour has evolved from a primordial regime dominated by molecular hydrogen...
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Eduard Muslimov (NOVA-ASTRON)17/05/2023, 13:00Poster
Wide-field Spectroscopic Telescope (WST) is a project of a next generation 10m-class telescope intended for spectroscopic surveys. It will include a multi-object spectrograph (MOS) unit covering a large field from 2.5 to 5 square degrees and providing medium (up to R7000) and high (R40 000) resolution spectra in the range of 360-1300 nm with a high multiplex of 20 000 and 2000, respectively....
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Elisa Costantini (SRON Netherlands Institute for Space Research)17/05/2023, 13:00Poster
A new era of high-resolution X-ray spectroscopy is upcoming. This spring, the JAXA/NASA (with SRON/UniGe/ESA participation) XRISM mission will be launched.
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As already revealed by the short-lived Hitomi mission, the new vision on an energy band never explored before at high resolution, will bring transformational results.
In particular, the X-ray calorimeter, Resolve, will bring new insight... -
Mark Snelders (ASTRON)17/05/2023, 13:00Poster
Fast radio bursts (FRBs) are enigmatic astrophysical transients; they are brief, intense flashes of radio emission from extragalactic sources. The extreme brightness and millisecond-duration timescales of FRBs indicate that they are likely produced by compact objects with large energy reservoirs, such as accreting black holes or magnetars (ultra-magnetic neutron stars). Although most FRBs...
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Timo Kist (Leiden Observatory)Poster
The damping wing signature of high-redshift quasars in the intergalactic medium (IGM) provides a unique way of probing the history of reionization. Next-generation surveys will collect a multitude of spectra that call for powerful statistical methods to constrain the underlying astrophysical parameters such as the global IGM neutral fraction as tightly as possible. Inferring these parameters...
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Timothy Wing Hei Yiu (ASTRON, the Netherlands Institute for Radio Astronomy; Kapteyn Astronomical Institute, University of Groningen)Poster
Radio observations are excellent probes of the environmental conditions in the coronae/magnetospheres of stars and brown dwarfs. In particular, radio emission traces the impact of stellar plasma on exoplanet atmospheres, the processes of coronal heating, and key parameters for assessing exo-habitability. The strong magnetic field of these stellar systems leads to radio emission via different...
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Floris Kummer (Anton Pannenkoek Institute)Poster
Massive stars are the progenitors to a vast variety of observed highly energetic transients. Many of these transients are presumably the product of interaction between two or more stellar companions. Until recently, theoretical work has mainly focused on understanding the evolution of single- and binary stars. However, recent observations show that triple (and higher order multiple) star...
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