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Session: Cosmology and Relativistic Astrophysics

Name: Ms. Eleni Antonopoulou (National & Kapodistrian Univ. of Athens)
Coauthors: No coauthors were included.
Type: Oral
Title: Tackling the SgrA* orbital motion riddle with a new General-Relativistic Ray Tracing code
Abstract:

The Gravity instrument detected a hotspot orbiting SgrA*, the supermassive black hole in the Galactic Center, during the observed Near-Infrared flares of 2018. The Gravity Collaboration fitted the trajectory of the July 22 hotspot with a circular Keplerian orbit of a few gravitational radii, yet the short orbital period and broad angular extent of the observed trajectory disfavor this fit. Motivated by these results, we developed a new Python code for General-Relativistic Radiative Transfer calculations in the Kerr spacetime. We describe the tests used to evaluate our code’s results and move on to investigate the kinematics of the aforementioned orbit, including various synchrotron emission models in our research.