COLLOQUIUM Diego Calderon (MPA Garching)

Interacting stellar winds feeding Sgr A*: from the system of mass-losing stars to the binary IRS 16SW

The discovery of cold structures around Sagittarius A* has challenged our understanding of the gas dynamics and thermodynamic state of the plasma in its vicinity. This works aims to constrain the conditions for the formation of such structures namely the cold disc-like structure and the recently discovered G-1-2-3 complex. We conduct hydrodynamic simulations of the observed Wolf-Rayet stars feeding Sgr A*. Our simulations show that the chemical composition of the plasma is crucial for determining the properties of the medium. We demonstrate that the formation of a cold disc is possible for certain chemical compositions that are consistent with observational constraints. However, it is not possible to reproduce all the properties of the observed disc which might suggest the action of another structure. Additionally, we present our first results on the hydrodynamic modelling of the colliding wind binary IRS 16SW. This is the first step to assess its role on the formation of the G-1-2-3 complex.

Talk in presence and via Zoom:

https://uni-hamburg.zoom.us/j/66006535328?pwd=aGkrSjJIYmZjK0VpYlpGL0ZrdHg2UT09