Conveners
Extragalactic astrophysics and cosmology
- Dmytro Orikhovskyi (Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)
-
Ms Olena Torbaniuk (Department of Physics, University Federico II in Naples, Naples, Italy)27/04/2021, 15:05
A connection between Supermassive Black Holes (SMBH) and galaxy growth has been suggested by a number of studies, based on empirical correlations between BH mass and integrated galaxy properties as galaxy bulge mass, total stellar mass, velocity dispersion and star formation rate (SFR). In particular current studies show that SFR and AGN activity appear to follow similar patterns with cosmic...
Go to contribution page -
Ms Kateryna Kulish (Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)27/04/2021, 15:20
We present the results of photometric observations and research of blazar PKS1222+216 with high temporal resolution (30–60 s) in the B, V and R filters of Johnson/Bessel system. The observations were performed with the AZT-8 (D = 0,7 m; F = 2.8 m; CCD PL4710-1-BB-E2V) telescope of the observation station Lisnyky of Astronomical Observatory of Taras Shevchenko National University of Kyiv during...
Go to contribution page -
10. Searching for signatures of chaos in gamma-ray light curves of selected Fermi-LAT blazars (12+3)M. Tarnopolski (Astronomical Observatory, Jagiellonian University, N.Zywucka Centre of Space Research, North-West University), Ms Oleksandra Ostapenko (Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)27/04/2021, 15:35
Blazar variability appears to be stochastic in nature. However, a possibility of low-dimensional chaos was considered in the past, but with no unambiguous detection so far. If present, it would constrain the emission mechanism by suggesting an underlying dynamical system. We rigorously searched for signatures of chaos in \textit{Fermi}-Large Area Telescope light curves of 11 blazars. The data...
Go to contribution page -
Mr Dmytro Orikhovskyi (Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)27/04/2021, 16:05
Hereby we present the results of photometric observations and research of two BL Lacertae objects: Markarian 501 and Markarian 421. The observations were performed with the AZT-8 (D = 70 cm, F = 2.8 m) telescope of the observation station Lisnyky of Astronomical Observatory of Taras Shevchenko National University of Kyiv during 2018-2020. The AZT-8 equipped with the PL4710-1-BB-E2V CCD and...
Go to contribution page -
Ms Iryna Chemerynska (Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)27/04/2021, 16:20
Thanks to the last years great success of the European Space Agency space mission GAIA and the latest data release of the 3D stellar positions and velocities in our Galaxy we now have a very accurate and homogenous data for the Milky Way Globular Cluster (GC) system space positions and velocities up to 200 kpc of Galactocentric distances. Based of the GC system current coordinates and...
Go to contribution page -
Mr Vadym Bidula (Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)27/04/2021, 16:35
Abstract: Enter abstract text below. The extent of the abstract should be limited to 37 lines. Any mathematical expressions or special characters write with LaTeX coding. *
Go to contribution page
We use different machine learning techniques to create and compare classifiers for the search of compact star-forming galaxies (CSFGs). The methods considered were: k-nearest neighbours, deep neural network, and gradient... -
Ms Nadiia Diachenko (Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)27/04/2021, 16:50
We consider a data driven approach as an alternative to the traditional photometric techniques to determine distance moduli m-M to the galaxies. In our first work (Elyiv et al., 2020, Astron. & Astrophys.) we tested the five machine learning regression techniques for inference of $m-M$: linear, polynomial, k-nearest neighbors, Gradient boosting, and artificial neural network and obtained rms...
Go to contribution page -
Ms Oleksandra Lukina (Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)27/04/2021, 17:25
The 4XMM-DR10 catalogue is the largest database of X-ray sources, the last version of which contains 575158 unique X-ray. The aim of our work was to obtain a sample of X-ray galaxies. To reach this goal, we created the sample based on the HyperLEDA database that consists of 7181 objects. In the current work, we present general properties of the sample, namely the distribution in equatorial...
Go to contribution page -
Mr Oleksandr Huhnin (Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)27/04/2021, 17:40
We calculated morphological parameters for test sample of 4659 galaxies from VIPERS survey. These parameters includes Gini, M20, Concentration, Asymmetry and Smoothness. Results correlate with the distribution of these parameters for other simulated and observed samples. We also studied dependence of these parameters with Sersic power index of radial distribution of surface brightness of galaxy image.
Go to contribution page -
Mr Rishabh Singh (Narayana etechno school, Tambaram, India)27/04/2021, 17:55
Black holes are one of the most mysterious objects in the universe. These objects(as you know) attracts particles towards it. It’s is formed when a heavy star dies,it forms a 4d curve in the space-time and attracts everything towards it. With this curvature,time is also effected. The more we go closer to the black hole the more the time gets dilated. This is explained by Einstein’s famous twin...
Go to contribution page -
Ms Aikaterini Niovi Triantafyllaki (Aix-Marseille Université, Marseille, France)27/04/2021, 18:10
Galaxies interact with each other forming bigger galaxies, following the hierarchical scenario, where bigger structures evolve from smaller ones. Here, I will explore how signatures of hierarchical evolution can be found in the distribution of light, kinematics and dynamics of nearby galaxies while in the meantime understand the difficulties on the carried out research that is done in this field.
Go to contribution page -
Mr Géza Csörnyei (Max Planck Institute for Astrophysics, Garching, Germany)27/04/2021, 18:25
Investigating period changes of classical Cepheids through the framework of $O-C$ diagrams provides a unique insight to the evolution and nature of these variable stars. In this work, we carried out the $O-C$ diagram calculation of 148 Galactic Cepheids with century long coverage. In multiple cases we observed peculiar $O-C$ behaviours that indicated the possible presence of a formerly...
Go to contribution page -
Ms Iryna Butsky (University of Washington, Seattle, United States)27/04/2021, 19:00
Galaxies evolve embedded in a vast gaseous halo that dwarfs the mass and spatial extent of stars in the galactic disk. Photoionization modeling suggests that cold circumgalactic gas has significantly lower densities than expected by theoretical predictions based on thermal pressure equilibrium with hot CGM gas. In this talk, I will demonstrate the impact of cosmic ray physics on the formation...
Go to contribution page