Speaker
Description
Sagittarius A is a super massive black hole in the center of our galaxy observed across the electromagnetic spectrum for decades. Moreover, it is the primary target of the Event Horizon Telescope (EHT) and the GRAVITY collaboration, which observe in the 230 GHz (EHT) and the NIR (GRAVITY). The compact radio emission is expected to be thermal radiation from the vicinity of the black hole. The NIR emission exhibits strong variability and flares which are observed from the Galactic center every 6-8 hours. Flaring activity has been attributed to re-connection events close to the Black hole. We perform general-relativistic magneto-hydrodynamic to model the accretion flow of SgrA, and employ thermal emission models to reproduce the emission at 230 GHz, analyzing the regions close to the black hole that this emission is generated. Furthermore, we monitor the magnetic re-connection events in the simulation and model the non-thermal emission at the NIR. Our investigation focuses on the production of flares from Sgr A* observed in the NIR from GRAVITY, our aim is to reproduce a model that calculates lightcurves at these frequencies.