Seminarium Zakładu Astrofizyki

Using Deep learning to predict the properties of Galaxy major mergers using EAGLE simulations

Galaxy mergers impact the evolution of galaxies by contributing to their mass growth and change in morphology thus motivating us to study them. Observational images capture mergers at a single instant in time making it hard to interpret their properties. Hence, we must resort to indirect means of assessing them by comparison with simulations. Simulations provide an all round quantitative understanding of galaxy mergers, their properties and impact on evolution. The idea is to utilize simulation data to infer observed galaxy merger properties.

Gravitational wave observations and their significance

Detection of gravitational wave signals from mergers of black holes and neutron stars is one the most important discoveries of this century. I shall briefly present the phenomenon of gravitational radiation as predicted by Einstein's general relativity. I shall describe gravitational wave detectors and methods of analysing gravitational wave data. I shall review the observations made during the two observational runs of LIGO and Virgo detector projects. I shall present the physical and astrophysical applications of these observations.

What can relativistic ion collisions teach us about neutron stars

Collisions of ions at relativistic energies and studied at BNL (USA) and at CERN. Soon, a dedicated NICA accelerator complex will be completed at JINR in Dubna, and soon after the FAIR complex at GSI. All those facilities aim to study the phase diagram of strongly interacting matter, which is directly related to the neutron star equation of state. In addition a large number of baryons, including the ones

The origin of low effective spins in LIGO/Virgo binary black hole mergers

All of the ten LIGO/Virgo binary black hole (BH-BH) merger detections to date have low values for their effective spins. There are only three potential explanations of this fact. If BH spin magnitudes are large then (i) both BH spin vectors must lie in/near orbital plane or (ii) BH spins are pointing in opposite directions. Or (iii) BH spin magnitudes are small.

New picture of the Milky Way

Milky Way is a complex system which exploration is hampered due to the presence of interstellar dust and the location of our Sun close to the Galactic plane. I will review the current knowledge on the structure and evolution of the Milky Way based on the most recent results obtained by large surveys.