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Sven De Rijcke30/05/2022, 13:00
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Archisman Ghosh (Ghent University)30/05/2022, 13:10
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Oliver Boersma (University of Amsterdam)30/05/2022, 13:40
Black hole-neutron star (BHNS) mergers have recently been detected through their gravitational-wave (GW) emission. Such mergers could also produce electromagnetic emission as a short gamma-ray burst (sGRB), and/or an sGRB afterglow upon interaction with the circummerger medium. In this talk, we present new simulations on the expected detection rates with the Square Kilometre Array Phase 1...
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Nicola Gaspari (Radboud University Nijmegen)30/05/2022, 13:55
The concurrent detection of GW 170817 and GRB 170817A secured the connection between binary neutron star (BNS) mergers and at least some short-duration gamma-ray bursts (sGRBs), allowing us to link several aspects of the two phenomena. Among the links opened by this connection, one is between the host galaxies of sGRBs and the environment of BNS mergers. From the study of sGRB hosts we can...
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Fiorenzo Stoppa (Radboud University Nijmegen)30/05/2022, 14:10
The common practice of model validation in statistical methods is not as widespread in astronomy. Too often, models are assumed to describe observations even when there is no agreement between the two. To improve this, we propose a practical framework for assessing the consistency between observations and astrophysical models in a model-independent manner. The consistency test uses a...
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Michiel Brentjens (ASTRON)30/05/2022, 14:35
ASTRON and S&T corporation are developing a detector of extreme solar radio bursts (SRBs). The aim is to provide real-time alerts and radio spectra from 3-3000MHz to KNMI and the Dutch military, so they can warn the Dutch vital economic sectors, as well as radio and radar operators of current radio interference due to the Sun. 70% of the first two phases of instrument development has been...
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Inja Kovačić (Ghent University)30/05/2022, 14:35
The observation of the far-IR 158 μm line of singly ionised carbon [CII] plays an important role in the study of star-forming regions of the interstellar medium (ISM) in galaxies. The connection between the [CII] fine-structure line and ionised phases of the ISM, could make [CII] emission a useful alternative star-formation rate (SFR) measure. However, due to the ambiguity of the origin of...
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Noemi La Bella (Radboud University Nijmegen)30/05/2022, 14:50
In 2019 the Event Horizon Telescope (EHT) delivered the first image of a black hole shadow in the center of the giant elliptical galaxy M87 and is expected to also produce high-resolution images of the supermassive black hole at the center of our Galaxy, Sgr A*. The latter is more challenging to image, being a short time-scale variable source and affected by the interstellar scattering. An...
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Sharon Meidt (Ghent University)30/05/2022, 14:50
The kinematics of molecular gas on cloud scales are a sensitive probe of the boundary conditions for star formation. Until recently, such measurements were only available for cloud populations within the Local group (including our own MW). But now, new survey capabilities are expanding our view of gas motions to a greater diversity of galactic environments, providing unprecedented constraints...
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Gan Hyoyin (University of Groningen)30/05/2022, 15:05
The detection of the faint 21-cm signal from the Epoch Reionisation (EoR) has been challenging due to strong foregrounds, ionospheric effects and radio frequency interference (RFI) etc. The precise calibration of data has been a key to the detection. Low frequency array (LOFAR) is a radio interferometer which is designed to detect the EoR. Over the years, the LOFAR-EoR team has been working on...
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Julia Healy (ASTRON)30/05/2022, 15:05
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. This replenishment, or accretion, of gas can potentially be detected in HI at column densities one or two orders of magnitude below previous observational limits. The Meerkat HI Observations of...
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Bjarni Pont (Radboud University Nijmegen)30/05/2022, 15:20
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 extra-galactic origin. It measures the MHz radio emission of extensive air showers produced by cosmic rays hitting our atmosphere. The elemental...
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Andres Filipe Ramos Padilla (University of Groningen)30/05/2022, 15:20
The conditions under which the cold gas of galaxies evolves are not well known at higher redshift. The best way to understand cold gas is by studying the interstellar medium (ISM) of galaxies at different cosmic times. Far-infrared (FIR) emission lines are powerful tools for understanding the various phases of the ISM in galaxies. With this in mind, we have combined the cosmological EAGLE...
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Mojtaba Raouf (Leiden University)30/05/2022, 15:35
We present hydrodynamic simulations of the chemical evolution of the interstellar medium (ISM) gas influenced by the feedback from active galactic nuclei (AGN), coupled with the CHIMES code to treat the radiative cooling, AGN heating, and chemistry. We focus on the central 500 pc around the black hole (BH) where the AGN outflows and radiation couple to the ISM. In the simulation, we are...
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Giacomo Cannizzaro (Radboud University Nijmegen)30/05/2022, 15:35
CSS100217 was a nuclear flare in a Seyfert 1 galaxy, whose initial interpretation as a nuclear supernova is now debated between a tidal disruption event (TDE) and a flare from the active galactic nucleus (AGN). We discuss new evidence in favour of a TDE interpretation, mainly the marked difference in the optical quiescent flux before and after the outburst, as the post-outburst flux level is...
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41. Can Molecular Ratios be used as Diagnostics of AGN and Starburst activity? The Case of NGC 1068.Joshua Butterworth30/05/2022, 15:50
The gas and dust present within galaxies, known as the Interstellar Medium (ISM), is not homogeneous; star formation, supernovae events, as well as AGN activities may all greatly alter the ISM. In particular, recent studies of nearby external galaxies have shown that the molecular ISM varies at kiloparsecs as well as at parsec scales, with evidence of different gas components traced by...
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Mariano Mendez (University of Groningen)30/05/2022, 15:50
Accreting black holes emit highly collimated radio jets expanding at speeds approaching light speed. Some of these jets appear to be expanding at superluminal speeds due to geometric effects. While magnetic fields are thought to be responsible for collimating the ejecta, the mechanism that accelerates the material in these jets remains unexplained. For the galactic black hole GRS 1915+105 with...
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Mark Snelders (ASTRON)30/05/2022, 16:35
Fast radio bursts (FRBs) are bright transient flashes of radio waves originating from extragalactic distances with an unknown origin. The FRBs observed to date typically last for order milliseconds. Bursts from FRB 20200120E, however, can be as short as 50 microseconds, and some of these bursts show sub-structure down to 60 nanoseconds. Probing FRB emission timescales constrains emission...
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Nikki Zabel (University of Groningen)30/05/2022, 16:35
Understanding galaxy formation and evolution is one of the key goals of astronomical research. With roughly half of the galaxies in the local Universe residing in dense environments, it is therefore important to study the effects of environment on galaxy evolution. It has been known for several decades that galaxy clusters harbour a relatively large fraction of early-type galaxies, suggesting...
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Bert Vandenbroucke (Leiden University)30/05/2022, 16:50
Non-spherical interstellar dust grains that are immersed in a magnetic field are expected to align with this field. The far-infrared (FIR) thermal emission of non-spherical grains is polarised along the longest axis of the grains. Combined, these two effects make polarised dust emission a powerful tool to study magnetic field configurations in environments where we expect a sufficiently strong...
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Sjoert van Velzen (Leiden University)30/05/2022, 16:50
The origin of most high-energy neutrinos is unknown. They have thus far been observed in coincidence with time-variable emission from three different types of accreting black holes: a gamma-ray flare from a blazar, an optical transient following a stellar tidal disruption, and an optical outburst from an active galactic nucleus. I propose a unified explanation for the latter two of these...
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Suma Murthy (JIVE)30/05/2022, 17:05
The interplay between the nuclear activity and the interstellar medium (ISM) of galaxies plays an important role in their evolution: the gas accreting onto the dormant supermassive black hole turns it into an active galactic nucleus (AGN) and the ensuing activity is believed to starve the host galaxy of the fuel needed to form stars. The contribution of radio-loud AGN to this feedback effect...
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Pranav Kukreti (University of Groningen)30/05/2022, 17:05
Galaxy mergers have been observed to trigger nuclear activity by feeding gas to the central supermassive black hole. One such class of objects are Ultra Luminous InfraRed Galaxies (ULIRGs), which are mostly late stage major mergers of gas-rich galaxies. Recently, large scale (∼100 kpc) radio continuum emission has been detected in a handful of ULIRGs, all of which also harbour powerful AGNs....
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Andras Dorozsmai (University of Amsterdam / University of Birmingham)30/05/2022, 17:20
The isolated formation channel is one of the most studied formation scenarios for stellar mass black hole binary (BBH) mergers detected by LIGO and Virgo. Focusing on the effects of uncertain stellar and binary physics, we investigate this BBH formation channel using the rapid binary population synthesis code SeBa. Regardless of our assumptions, the two must common formation path within the...
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Valentin Mauerhofer (University of Groningen)30/05/2022, 17:20
The last phase transition of our Universe is Reionization, when the first galaxies emitted energetic photons that ionized the intergalactic medium (IGM). The escape of ionizing photons from complex galactic environments is a key process to understand Reionization. However, the opacity of the neutral high redshift IGM results in the need of indirect methods of studying ionizing photons. I will...
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Anqi Li (University of Groningen)30/05/2022, 17:35
It is widely accepted that disc galaxies sustain their star formation by accreting gas from the external environment. In this study, we focus on one possible mechanism: hot CGM (corona) condensation triggered by the galactic fountain. Supernova feedback in star-forming galaxies continuously ejects out the plane part of the disc gas, which travels in the halo and falls back to the disc. This...
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Violeta Gamez Rosas (Leiden University)30/05/2022, 17:35
In the Unification Theory of AGNs the concept of “the torus” plays a crucial role to discern between Type-1 and Type-2 AGNs. Its emission, coming from hot and warm dust peaks at infrared wavelengths, which makes MATISSE an ideal instrument to observe it. The wide spectral coverage of the L, M and N bands, and the high spatial resolution that MATISSE offers, together with its capability to...
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Ashley Chrimes (Radboud University Nijmegen)30/05/2022, 17:50
The nature and origin of magnetars is a key question across a range of research areas, from fundamental physics to transient astrophysics, where they have been invoked as the engines of a variety of transients including fast radio bursts. It is currently unclear whether magnetars are a common outcome of core-collapse events - only appearing rare due to their short active lifetimes - or if...
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Ko-Yun Huang (Leiden University)30/05/2022, 17:50
In the nearby (D=14 Mpc) AGN-starburst composite galaxy NGC 1068, it has been found that the molecular gas in the CND is outflowing, which is a manifestation of ongoing AGN feedback (García- Burillo et al. 2014). The induced interaction between the AGN ionized wind & jet with the molecular gas on the CND has produced large-scale molecular shocks on spatial scales of up to 400 pc from the AGN....
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Shun-Sheng Li (Leiden University)30/05/2022, 18:05
Weak gravitational lensing, the deflection of light rays caused by the inhomogeneous matter distributions, has been a powerful tool for observational cosmology. While promising in the application, it is demanding to measure the weak lensing signals to the desired accuracy in practice. With the ever-growing statistical powers of weak lensing surveys, it is critical to address any potential...
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Omar Ould-Boukattine (University of Amsterdam / ASTRON)30/05/2022, 18:05
The burst energy distributions of repeating fast radio burst (FRB) sources are an important diagnostic of the emission process. To date, burst energy distributions have only been studied for a few active repeaters, and are limited both by telescope sensitivity (for the weakest and most common bursts) and on-sky time (for the brightest and rarest bursts). Though there is evidence for a...
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David Valls-Gabaud (Observatoire de Paris)30/05/2022, 18:20
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30/05/2022, 20:00
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Katharine Mulrey (Radboud University Nijmegen)31/05/2022, 09:00
Detecting cosmic rays using the radio emission generated in extensive air showers that form when cosmic rays interact in the atmosphere has proven to be a highly effective technique. Existing radio telescopes can detect this signal, and the dense antenna spacing of the LOFAR telescope and the upcoming SKA telescope make these instruments ideal to probe the features of radio emission in great...
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Anthony Brown (Leiden University)31/05/2022, 09:20
On June 13 2022 Gaia Data Release 3 will be made public. This release will feature a major increase in the availability of astrophysical information on sources throughout the Milky Way, including stellar parameters and abundances (some 500 million sources), spectra for some 220 million sources, and parameters of variable and binary stars, among many other new data products. I will provide a...
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Marijn Franx (Leiden University)31/05/2022, 09:40
I discuss briefly the current status of JWST commissioning and the planning of the first cycle
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Ramon Navarro (NOVA)31/05/2022, 10:00
This presentation provides an overview of the NOVA instrumentation program for optical and infrared observations. It includes a review of the development of MIRI for the James Webb Space Telescope (JWST), the suite of instruments developed for the ESO Very Large Telescope (VLT), and the instruments currently being developed for the Extremely Large Telescope (ELT). NOVA contributions to other...
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Nicolas Crouzet (Leiden University)31/05/2022, 10:15
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Caroline Straatman (Ghent University)31/05/2022, 11:00
The relation between half-light radius and galaxy stellar mass has in recent years been studied extensively using large photometric surveys. This scaling relation has been found to be different for early types and late types, with different logarithmic slopes and zero points, and to evolve with time. While it provides important clues as to the assembly history of galaxies, the interpretation...
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Mats Esseldeurs (KU Leuven)31/05/2022, 11:00
The cool and dusty circumstellar envelopes of asymptotic giant branch (AGB) have for a long time been modelled assuming a spherical symmetry. High spatial resolution observations of these stars have shown that their surroundings exhibit a variety of complex structures. Most of these structures are believed to originate from the interaction of the AGB wind with an obfuscated, nearby, orbiting...
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Till Kaeufer (University of Groningen)31/05/2022, 11:15
A common method to determine the physical properties of protoplanetary disks is to analyse their spectral energy distributions (SEDs). However, the results are well-known to be degenerate. Running a full Bayesian analysis that can address this problem is challenging due to the high computational cost of full radiative transfer models. In my talk, I will show how we successfully train Neural...
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Pavel E. Mancera Piña (University of Groningen)31/05/2022, 11:15
The formation of ultra-diffuse galaxies is one of the most actively discussed subjects in extra-galactic astronomy during the last years. Yet, no clear consensus has been reached regarding their evolutionary pathways, with a number of simulations producing UDG-like galaxies using very different feedback prescriptions and even with different dark matter haloes properties. In order to test such...
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Nicolas Brughmans (KU Leuven)31/05/2022, 11:30
Prominences are cool, dense plasma clouds found in the optically thin solar corona, which makes them classical examples of condensations due to thermal instability. The levitation-condensation mechanism has been used in simulations to explain prominence formation in a flux rope, which is created through shearing and converging motions of coronal loop footpoints. These simulations employ two...
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Teymoor Saifollahi (University of Groningen)31/05/2022, 11:30
While the general properties of the very low surface brightness galaxies with large effective radii (recently been dubbed "Ultra Diffuse Galaxies" or "UDGs") were once thought to be a challenge for the existing models of galaxy formation, the triumph of recent models in reproducing these properties erases most of the raised concerns in our understating of galaxy formation...
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Eleanor Spring (University of Amsterdam )31/05/2022, 11:45
The extreme contrast ratios between stars and their planets at optical wavelengths make it challenging to isolate light reflected by exoplanet atmospheres. Yet, these reflective properties reveal key processes occurring in the atmospheres, and also span wavelengths that include potential O2 biosignatures. High resolution cross-correlation spectroscopy (HRCCS) offers a robust avenue for...
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Elena Maria Rossi (Leiden University)31/05/2022, 11:45
I will present my group's work on exploiting ongoing Gaia data releases to constrain the hardly observable properties of our own Galactic Center exploiting rare unbound stars, that are ejected from the vicinity of SgrA* and travel on unbound orbit through the Milky Way Halo.
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Anastasia Gvozdenko (Radboud University Nijmegen)31/05/2022, 12:00
We present a detailed chemical abundance analysis of the YMC NGC 1569-B. The host galaxy, NGC 1569, is a dwarf irregular starburst galaxy located 3.4 Mpc away. We derive abundances of the α, Fe-peak, and heavy elements. Abundance ratios were determined from the analysis of an optical integrated-light spectrum of NGC 1569-B, obtained with the HIRES echelle spectrograph on the Keck I telescope....
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Angelos Nersesian (Ghent University)31/05/2022, 12:00
Galaxies are an amalgamation of several components (dark matter, stars, gas, and dust), constantly interacting with one another. This interaction is imprinted on the spectral energy distribution (SED) of a given galaxy. Panchromatic SED fitting can shed light on the astrophysical processes that regulate galaxy evolution. However, the current SED modeling approaches come with many caveats and...
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Rico Landman (Leiden University)31/05/2022, 12:15
Ultra-hot Jupiters have dayside temperatures at which most molecules are thermally dissociated. The dissociation of water vapour results in the production of the hydroxyl radical (OH). We report on the detection of OH in the atmosphere of the ultra-hot Jupiter WASP-76b using high-resolution transmission spectroscopy with CARMENES. Our detection shows that water is indeed being thermally...
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Eduardo Balbinot (University of Groningen)31/05/2022, 12:15
Gaia eDR3 (and soon DR3) has revealed a number of kinematic groups in the solar neighbourhood. Some of these are now well know major accretion events such as Gaia-Enceladus-Sausage and Sequoia. Other smaller groups have been identified and their nature is not fully understood. Here I will present a method to extend the local spectroscopic sample by extrapolating the orbits of less-prominent...
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Jean-Pierre Grootaerd (Ghent University)31/05/2022, 13:30
An Astronomy Project for children with disabilities and underserved communities around the world
Stars Shine for everyone Project is a cooperation between UGent Volkssterrenwacht Armand Pien and Ghent University, started in 2015. Purpose of the project: ” To give children in special education and vulnerable people the opportunity to admire the starry sky with the help of a telescope.”...
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Hans Bekaert (KU Leuven)31/05/2022, 13:50
To study to what extent students have insight in the Apparent Motion of the Sun and Stars (AMoSS), we have designed the AMoSS test instrument with 12 multiple choice questions, which focus on distinctions between the apparent motion of the Sun and stars. We administered the AMoSS test to students of the fifth year (16-17 years old) of 6 Belgian secondary schools (N=410) during a science lesson...
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Esther Hanko (University of Amsterdam )31/05/2022, 14:05
The public observing nights at the Anton Pannekoek Institute are fully booked every month. With the arrival of corona, we moved our events online, like so many others. This served those who were interested in theory, but not those who came to us because they wanted a glimpse of the night sky through a real telescope. To still be able to serve (and expand) this part of our audience, we teamed...
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Jake Noel-Storr (University of Groningen)31/05/2022, 14:20
I will share updates on efforts to promote inclusion and diversity in astronomy from the European Astornomical Society Advisory Committee on Diversity and Inclusion , and the International Astronomical Union Executive Committee Working Group on Equity and Diversity in Astronomy. I will discuss current activity, implications and connections for Dutch and Belgian Astronomy, and how to become...
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Tana Joseph (University of Amsterdam)31/05/2022, 14:35
I will share updates on efforts to promote inclusion and diversity in astronomy from the European Astornomical Society Advisory Committee on Diversity and Inclusion , and the International Astronomical Union Executive Committee Working Group on Equity and Diversity in Astronomy. I will discuss current activity, implications and connections for Dutch and Belgian Astronomy, and how to become...
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Giovanna Pugliese (Leiden University)31/05/2022, 14:50
The SKIES project is part of Horizon 2020 funded by the EU, and aimed to provide training on innovation, entrepreneurship and open science topics to Dutch astronomy PhD students and early-career researchers in combination with an individual mentoring programme. The training course was developed in collaboration with research institutes in Germany, Poland, Portugal, South Africa and external...
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Anand Utsav Kapoor (Ghent University)31/05/2022, 16:30
The current state-of-the-art cosmological simulations do not treat dust physics. Given the significant impact of dust on the observables, this is done at a post-processing stage. A number of post-processing studies using the SKIRT radiative transfer code have shown that the UV broadband fluxes and IR colors are a source of tension with observational data. Various reasons have been attributed...
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Amy Louca (Leiden University)31/05/2022, 16:30
M-dwarfs are thought to be hostile environments for exoplanets. Stellar events are very common on such stars. These events might cause the atmospheres of exoplanets to change significantly over time. It is not only the major stellar flare events that contribute to this disequilibrium, but the smaller flares might also affect the atmospheres in an accumulating manner. In this study, we aim to...
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Silke Maes (KU Leuven)31/05/2022, 16:45
Asymptotic giant branch (AGB) stars are known to lose a significant amount of mass. Besides being interesting dynamical environments, the resulting outflows are rich astrochemical laboratories; close to a 100 chemical species and about 15 newly formed dust grains have been detected so far. They host interesting and unique chemical regimes thanks to the large gradients in temperature and...
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Dimitris Chatzigiannakis (Leiden University)31/05/2022, 16:45
We present a robust representation of the galaxy group NGC 5813's chemical and thermal structure analysing archival, deep X-ray observations of the group using up to date atomic line emission models and multi temperature spectral model. The selection of our target is motivated by the fact that NGC 5813 has a very relaxed morphology, making it a promissing candidate for the study of the AGN...
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Fraser Evans (Leiden University)31/05/2022, 17:00
Following a close dynamical encounter with Sgr A, stellar binaries in the Galactic Centre (GC) can be tidally separated. One member star remains bound to Sgr A and the other is ejected as a hyper-velocity star (HVS) with a velocity beyond the escape speed of the Milky Way. The abundance and properties of these objects can provide insight into still-uncertain aspects of the stellar...
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Ardjan Sturm (Leiden University)31/05/2022, 17:00
The total disk gas mass and elemental C, N, O composition of a protoplanetary disk are crucial ingredients for our understanding of planet formation. Measuring the gas mass is complicated as we lack the far-IR facilities necessary to observe HD, and the elemental abundances with respect to hydrogen are degenerate with gas mass in all disk models. We determined the gas mass and elemental...
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Emma van der Wateren (ASTRON)31/05/2022, 17:15
In this talk, I will discuss results from radio timing observations of the black widow binary pulsar J0610-2100 and optical observations of its binary companion. The radio timing observations extend the timing baseline to 16 yr and reveal a marginal detection of the orbital period derivative, but they show no significant evidence of orbital variations such as those seen in other black widow...
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Andrea Gebek (Ghent University)31/05/2022, 17:15
The state of the neutral interstellar medium critically affects the galactic star formation process and baryon cycle. Cosmological simulations which emulate galaxy evolution for a statistical sample of galaxies typically do not consider the transition of atomic to molecular hydrogen in the cold neutral medium. To compare the simulation output to observations, the atomic and molecular fractions...
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Turgay Caglar (Leiden University)31/05/2022, 17:30
We present central stellar velocity dispersion measurements for 158 type 1 AGNs from the second data release of the Swift/BAT AGN Spectroscopic Survey (BASS DR2) with a redshift cut-off z < 0.08. A total number of 297 type 1 AGN spectra are fit for obtaining two independent measurements from the Ca II H+K + Mg I region (3880 - 5550 ̊A) and the calcium triplet region (8350-8750 ̊A). The...
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Joost van den Born (University of Groningen)31/05/2022, 17:30
Atmospheric dispersion, the wavelength dependent differential refraction of light passing through the atmosphere, will cause severe degradation of image quality and contrast on the upcoming Extremely Large Telescope (ELT). Although the effect is the most severe at short wavelengths and low observing altitudes, the high resolution of the ELT causes atmospheric dispersion to be a problem well...
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Emanuele Greco (University of Amsterdam)31/05/2022, 17:45
Since the day of its explosion, supernova (SN) 1987A has been closely monitored to study its evolution and to detect its central compact relic. In fact, the formation of a neutron star is strongly supported by the detection of neutrinos from the SN. However, besides the detection in the Atacama Large Millimeter/submillimeter Array (ALMA) data of a feature that is somehow compatible with the...
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Asger Groennow (University of Groningen)31/05/2022, 17:45
Relatively massive galaxies such as the Milky Way are expected from theoretical galaxy formation and cosmological simulations to contain a hot gas corona extending to roughly the virial radius. In the Milky Way the existence of this hot corona has been established mainly relatively close to the galactic disc through observations in absorption and X-ray emission. Most constraints on the density...
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Jeremy Chastenet (Ghent University)31/05/2022, 18:00
For its numerous effects on the evolution of a galaxy, dust has been studied in detail ever since its discovery. Visible in emission in the infrared regime, its spectral energy distribution is a powerful tracer of many properties, when fit by physical dust models. There remains however a property of dust grains that has not yet been poked at extensively, potentially retaining some crucial...
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Filippo Maccagni (ASTRON)31/05/2022, 18:00
The recent MeerKAT deep surveys in the nearby Universe opened a new era of investigation of the neutral atomic (HI) gas in nearby galaxies. By reaching high spatial and spectral resolution with short observations, along with a large field of view (~1 degree), MeerKAT now enables us to investigate the presence of low-column density (~1x10^18 cm^-2) HI in all types of galaxies in different...
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Bert Vander Meulen (Ghent University)31/05/2022, 18:15
Large amounts of gas and dust are found in the central regions of most active galaxies. These ambient media play a crucial role as they provide the accretion reservoir powering AGNs and reprocess the X-ray, UV and optical emission of the central engine. Yet, the detailed characteristics of these regions and the physics behind them remain unknown. Recent radiative transfer modelling suggests...
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Will Robson Monteiro Rocha (Leiden University)31/05/2022, 18:15
Water ice has been found to be ubiquitous in quiescent molecular clouds and star-forming regions. It is formed on the surface of tiny dust grains located in cold environments (~10K). Satellite missions have concluded that water enters protoplanetary disks mostly as ice, and may later be delivered to planets. This emphasizes the need of knowing the basic properties of water ice, which will be...
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Fangyou Gao (University of Groningen)31/05/2022, 18:30
Protoclusters are progenitors of galaxy clusters at the present day and are important for studying how halo mass and stellar mass assemble in the early universe. Tracing signposts that are expected to live in dense regions is a widely adopted method to identify protoclusters. Bright dusty star-forming galaxies (DSFG) are one of these signposts. Hyperluminous infrared galaxies (HLIRGs), which...
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Anne Inkenhaag (Radboud University Nijmegen / Leiden University)31/05/2022, 18:30
Recently an unexpected UV afterglow was reported for the Fast Blue Optical Transient AT2018cow. The most supported explanation for this event is currently a peculiar supernova, although other theories cannot be ruled out. Supernovae are expected to become redder over time, and not much research has gone into potential UV afterglows of such events. We investigate whether there are UV afterglows...
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Niccolo Veronesi31/05/2022, 18:45
The origin of the Binary Black Hole (BBH) mergers detected through Gravitational Waves by the LIGO-Virgo-KAGRA collaboration remains debated. One fundamental reason is our ignorance of their host environment, as the typical size of an event’s localization volume can easily contain thousands of galaxies. Statistical approaches can be used to assess the spatial correlation between these mergers...
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Koen Kuijken (Leiden University)01/06/2022, 09:00
KiDS, the Kilo-Degree Survey, has mapped the distribution of dark matter using gravitational lensing. The final 'Legacy' analysis is underway, but results based on 2/3 of the data are available and provide interesting tests of the standard Lambda-CDM model of cosmology, including intriguing discrepancies. I will discuss these results as well as look forward to the improvements that can be...
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Henk Hoekstra (Leiden University)01/06/2022, 09:20
The KiloDegree Survey has proven to be a fertile training ground in preparation for Euclid, ESA's satellite to study the nature of dark matter and dark energy. In this talk I present some recent highlights from KiDS, with a focus on how observations can be used to account for astrophysical sources of bias, thus improving the fidelity of current and future constraints on cosmological parameters.
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Nina Sartorio (Ghent University)01/06/2022, 09:40
The first population of X-ray binaries are expected to affect the thermal and ionization states of the gas in the early Universe. Although these X-ray sources are predicted to have important implications for high-redshift observable signals, such as the hydrogen 21-cm signal from cosmic dawn and the cosmic X-ray background, their properties are poorly explored and theoretical models are...
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Bharat Kumar Gehlot (University of Groningen)01/06/2022, 10:00
Observations of the redshifted 21-cm signal of neutral hydrogen from the Cosmic Dawn and Reionization epochs promise to provide valuable insights into the (astro)physical processes that governed the structure formation in the early Universe. The AARTFAAC wide-field imager of the LOFAR telescope is an excellent instrument to measure the redshifted 21-cm signal on large angular scales from the...
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Ecaterina Leonova (University of Amsterdam)01/06/2022, 10:15
Before the end of the epoch of reionization, the Hydrogen in the Universe was predominantly neutral. This leads to strong attenuation of Lyman alpha lines of z>6 galaxies in the intergalactic medium. Nevertheless, Lyman alpha has been detected up to very high redshifts (z~9) for several especially UV luminous galaxies. Here, we test to what extent the galaxy's local environment might impact...
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Ronny Keppens (KU Leuven)01/06/2022, 11:00
During the last three decades, the astrophysical literature collected ever growing evidence that magnetic fields, however weak, play a decisive role in triggering turbulent flow in accretion disks. A process referred to by its acronym MRI, for magneto-rotational instability, provides a universally accepted explanation of why magnetized accretion disks turn turbulent at all. Magnetic fields and...
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Stefanie Fijma (University of Amsterdam)01/06/2022, 11:20
The coupling between radio and X-ray luminosity is an important diagnostic tool to study the connection between the accretion inflow and jet outflow for low-mass X-ray binaries (LMXBs). Moreover, the comparison of NS- and BH-LMXBs provides useful information about the role of compact objects in launching jets. Interestingly, studies have shown discrepancies between the radio-X-ray coupling of...
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Akke Corporaal (KU Leuven)01/06/2022, 11:40
Circumstellar discs are found at different evolutionary stages of stars. In this talk, I will focus on a class of evolved stellar systems that show stable circumbinary discs of gas and dust, namely post-asymptotic giant branch (post-AGB) binary systems. These circumbinary discs show remarkable, but unexpected, similarities with planet forming discs around young stellar objects. Using infrared...
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Fabiola Antonietta Gerosa (University of Cote d'Azur)
Planetesimal formation in protoplanetary disks is still one of the major open questions in planet formation theory. It is known that solids can’t grow up to asteroid size relying on sticking after pairwise collisions only, due to the fragmentation barrier and the drift barrier. A possible solution is to form dense particle clumps, with low velocity-dispersion, that can then collapse under...
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