Two longer seminars will be followed by a series of short (~15 + 5 min) talks will be presented to start hands-on work and initiate further discussions related to the Czech-German Student Exchange (Prague-Cologne & Friends). Program: Vladimír Karas: Welcome, & Interacting accretion rings from tidally disrupted binaries • • Florian Peissker: Finding binaries in the S cluster: A 20-year journey • • Barbora Bezděková: Light trajectories near compact relativistic sources surrounded by media of dispersive and refractive properties• • Jan Palouš: Supernovae in the Galactic Center • • Emma Bordier: High-angular resolution insights into massive stars: revealing hidden companions and tracing back the formation history • • Maria Melamed: Galactic Center object G1 • • Chinmaya Nagar: Investigating stellar multiplicity in embedded young massive stellar clusters with NACO • • Myank Singhal: Evolution of stellar binaries in a disk • • ... • • Joint walk in Prague downtown • • Individual work and brainstorming discussion

Location: ASU Praha-Spořilov

Workshop on "Physics of supermassive black holes and their star-forming environment" (Prague, 26-29 November 2024). Zoom: t.b.d.

A group of high-velocity stars known as S-stars can be found near the central supermassive black hole Sagittarius A* at 40 mpc scales, where the brightest S-cluster members have an average age of 6 million years. Despite the predicted binary fraction, no binary system has been detected to date. Here, we will review the currents state and new progress in the field.

Location: ASU Praha-Spořilov

Workshop on "Physics of supermassive black holes and their star-forming environment" (Prague, 26-29 November 2024). Zoom: t.b.d.

Light bending caused by the gravitational field in a vicinity of black holes and neutron stars has been currently a vivid research topic mostly due to the recent observations of the Event Horizon Telescope (EHT). Although numerical approach to this problem can be very effective, analytical solutions remain still valuable, providing a clear distinction between the effects caused by gravity and the medium enlosing the object. I will present a Hamiltonian formalism which allows to describe such a system, and I will show its possible applications. I will also discuss the effects of plasma which typically surrounds the black hole and how its presence can change the light trajectories.

Location: ASU Praha-Spořilov

Workshop on "Physics of supermassive black holes and their star-forming environment" (Prague, 26-29 November 2024). Zoom: t.b.d.