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András Kovács (Konkoly Observatory)17/03/2026, 09:00
A. Kovács, S. Frey, J. Vinkó
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Emma Kun (HUN-REN Konkoly Observatory)17/03/2026, 09:30
Neutrino astronomy with the IceCube detector probes the high-energy Universe through astrophysical neutrinos in the GeV–PeV energy range in a fundamentally different way than photon-based observations. Neutrino telescopes do not record images of the sky; instead, source associations are inferred statistically from reconstructed neutrino events. To date, only three neutrino sources have reached...
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Gerard Williger (Konkoly Obs / U Louisville)17/03/2026, 09:45
The GALaxy Evolution eXplorer (GALEX) satellite imaged the sky at
ultraviolet wavelengths over 2003-13, making a well-cited catalogue.
It also took wide-field spectra of 125,000 objects over 0.75% of the
sky, which are under-exploited.To make the spectra useful, we present results from a project tocategorize and collect complementary multiband data for approximately
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11,000... -
Dr Eniko Regos (Konkoly)17/03/2026, 10:00
We investigate how pulsar timing array (PTA) measurements of the nanoHertz gravitational-wave background (GWB) can constrain models for the growth history of supermassive black holes (SMBHs) and how active galactic nucleus (AGN) and stellar feedback models can affect GWB predictions. Feedback regulates supermassive black hole (SMBH) growth, altering the black hole mass function (BHMF). Using...
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Krisztina Perger (Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences)17/03/2026, 10:15
A new population of high-redshift sources was discovered by the James Webb Space Telescope, referred to as little red dots (LRDs). These are a mysterious class of objects that appear to be extremely compact in size, show excess ultraviolet emission, have a red optical continuum in the rest-frame, and exhibit broad-line spectral features. Collecting a sample of 919 LRDs from the literature, we...
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Janka Kőmíves (Eötvös Loránd Tudományegyetem)17/03/2026, 11:00
Milliarcsecond-scale radio observations of active galactic nuclei (AGN) can help us determine the origin of their radio emission. In case of blazars, radio-loud AGN with their jets pointed close to our line of sight, most of the emission comes from the relativistically boosted jet. However, the radio emission of AGN can originate not only from the jets but from the accretion disk corona or...
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Dávid Koller (Konkoly Observatory, HUN-REN CSFK / Eötvös Loránd University, Budapest)17/03/2026, 11:15
Our understanding of jet kinematics in z ≥ 3 quasars is still rather limited, based on a sample of less than about 50 objects. We present very long baseline interferometric (VLBI) observations of the powerful blazar J1429+5406 at z=3.015, observed at six frequencies (0.4–15 GHz) between 1994 and 2024. While outer jet components at ∼20–40 milliarcsecond (mas) show no apparent motion, three...
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Balázs Pinczel (Eötvös Loránd University)17/03/2026, 11:30
The morphological analysis of galaxies provides important insights into the physical processes that shape their formation and evolution. Modern sky surveys, such as the Legacy Survey of Space and Time (LSST) conducted by the Vera C. Rubin Observatory, enable the study of galaxy morphology across large samples, further increasing the need for efficient automated analysis methods.
This...
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Dr Jose Bermejo (Konkoly Observatory)17/03/2026, 11:45
We live in the era of big data cosmology, as many large scale structure surveys like DESI, Euclid and LSST are happening this decade. These datasets are mapping the Universe with unprecedented sensitivity and depth, and will allow us to better understand the nature of dark energy. However, they are also useful to trace the physics of the primordial Universe, and in particular, we can determine...
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Zsófia Bora17/03/2026, 12:00
High-velocity (25-30000 km/s) lines (HVFs) of Ca II were first discovered in the spectrum of SN1994D in 1999, and since then, they have been proven to be ubiquitous. Despite this, their exact origin remains unclear to this day. They appear to form in a higher-velocity layer above the photosphere (10-15000 km/s) and show varying strengths and velocity evolutions from object to object.
We...
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Ágoston Horti-Dávid (HUN-REN Csillagászati és Földtudományi Kutatóközpont Konkoly Thege Miklós Csillagászati Intézet)17/03/2026, 12:15
The Coma galaxy cluster has long been used as a cosmic laboratory. This is no coincidence, as it is one of the closest large galaxy clusters to us after the Virgo cluster. Its distance is large enough for the Hubble flow to dominate, but still close enough to be studied in detail.
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In our research, we attempted to determine the Coma galaxy cluster's distance as precisely as possible using Type... -
Mina Ghodsi Yengejeh (Konkoly Observatory)17/03/2026, 13:30
The late-time linear Integrated Sachs-Wolfe (ISW) effect directly probes the dynamics of cosmic acceleration and the nature of dark energy. Detecting these weak, secondary temperature anisotropy signals of the CMB requires accurate theoretical predictions of their amplitude across cosmological models. By extending the pyGenISW package, previously limited to $\Lambda$CDM, we aim to generate...
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Killian Maxwell (ELTE)17/03/2026, 13:45
Utilizing a Graph Convolutional Neural Network (GCNN) called DeepSphere as the masked portion of a Masked Auto-regressive Flow (MAF), joint posteriors for Omega-Matter and Sigma-8 can be inferred from density maps and ISW maps derived from the first Gower Street simulation suite.
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Mónica Hernández Sánchez (Universitat de València)17/03/2026, 14:00
The Large-Scale Structure (LSS) of the Universe is organised into clusters of galaxies connected by a network of filaments and underdense cosmic voids, which occupy most of the cosmic volume. This LSS can influence the formation and evolution of galaxies and affect their physical properties. However, there is currently no consensus on how to parametrise a galaxy location with respect to...
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Ágnes Bogdán (Konkoly Observatory)17/03/2026, 14:15
Details will be here soon...
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Laszlo Dobos (E)17/03/2026, 14:30
Investigating dSph galaxies with the Subaru PFS
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Enikő Pichler17/03/2026, 14:45
Dwarf galaxies have low gravitational potential, low metallicity and are vulnerable to effects like shockwaves from supernovae. Star formation is expected to be inefficient in these systems, but that is not the case. I present my kinematical analysis of DDO 43, an isolated irregular dwarf in the Local Universe. I used VLA archival data of the HI content of DDO 43 to describe the local motions...
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Nestor Arsenov (Institute of Astronomy, Sofia; Konkoly Observatory, Budapest)17/03/2026, 15:30
Understanding the formation and evolution of the cosmic web of galaxies is a fundamental goal of both theoretical and observational cosmology, which use various tracers of the cosmic large-scale structure at an ever wider range of redshifts. We present an advancement in mapping of the cosmic web at high redshifts using observational and synthetic catalogues of quasars, which offer a powerful...
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Wancheng Xu (Xinjiang Astronomical Observatory of the Chinese Academy of Sciences; Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences)17/03/2026, 15:45
Dual and multiple active galactic nuclei (AGN) in merger systems play a crucial role in our understanding of supermassive black hole growth and evolution. However, the current scarcity of confirmed samples limits statistical studies. In this talk, I will present an overview of my ongoing research using high-resolution Very Long Baseline Interferometry (VLBI) to characterize and confirm scarce...
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Domonkos Szabó17/03/2026, 16:00
Tidal disruption events (TDEs) occur when a supermassive black hole’s (SMBH) gravitational pull tears a star apart, resulting in a bright burst of electromagnetic radiation. These events provide important information about the environment of SMBHs. When the star is disrupted, some of its material forms an accretion disk around the black hole, emitting radiation as it heats up. However, the...
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Bendegúz Koncz (Debreceni Egyetem)17/03/2026, 16:15
Galaxy evolution over time remains unclear, with ongoing debate about how collisions affect star formation and metallicity. The role of the local environment shaped by the large-scale structure of the Universe in galaxy mergers may be significant, yet it has not been thoroughly examined. Using the IllustrisTNG cosmological simulation, we processed the catalogue data and merger tree files of...
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