Wednesday Colloquium



05.10.2022

"Simulating globular cluster populations around Milky Way and Andromeda-like galaxies with MOCCA models"

Agostino Leveque (CAMK, PAN)

The ability to model both the large-scale dynamics (0.01-10 kpc) controlling globular clusters (GC) orbital evolution, and the small-scale dynamics (sub-pc-AU) controlling the internal GC dynamics are essential for a detailed investigation of the co-evolution of GC systems (GCS) in galaxies. We introduced a novel method for the simultaneous evolution of large GCS that combines fully self-consistent Monte Carlo MOCCA models with semi-analytic GCS models. In order to reproduce the observable features of GCs in the Milky Way and Andromeda, we generated synthetic GC populations using the population synthesis code MASinGa and the MOCCA-Survey Database I. In this study, an attempt was made to determine constraints to the spatial distribution of GCs in both galaxies and the contribution of GC to the formation of the nuclear star cluster and supermassive black holes. Additionally, the black hole and black hole-black hole binaries populations in globular clusters in these galaxies have been studied


12.10.2022

"Imaging X-ray Polarimetry Explorer (IXPE) satellite-based mission: instruments, observations, and synergy with other missions"

Grzegorz Madejski (Stanford University and SLAC National Accelerator Center, Stanford, California)

Imaging X-ray Polarimetry Explorer (IXPE) is an international, NASA-led satellite-based mission designed to study polarization of celestial sources in X-ray band, over a bandpass of 2 - 8 keV. The payload, launched in December 2021, consists of three telescopes (built at NASA's Marshall Space Flight Center) focussing X-rays onto polarization-sensitive imaging detectors (built at INFN / Pisa, Italy). This presentation will provide an overview of the mission, and will highlight several early IXPE observations, where the detection (or sensitive non-detection) provides important constraints on the emission processes as well as geometry of celestial X-ray emitters. It will also highlight the synergy of IXPE observations with the data obtained in other wavelengths besides soft X-rays.


26.10.2022

"Accretion disk backflow in resistive MHD simulations"

Ruchi Mishra (CAMK, Warsaw)