Testing the nature of Sgr A* with the S-2 star orbit data

CRESPI, V.; ARGÜELLES, C. R.; M. F. MESTRE

CABA

Congreso; Reunion Anual #64 de la Asociacion Argentina de Astronomia; 2024

IAFE, UBA

The stars of the S-cluster orbiting the Galactic center provide one of the best astrophysical observablesto infer the gravitational potential generated by the central source Sgr A*, traditionally assumed to be a Black Hole(BH). An alternative model for Sgr A* is the Ruffini-Arg¨uelles-Rueda (RAR) model, based on a self-gravitatingsystem of neutral fermions in the framework of General Relativity. It predicts the existence of a dense coreof highly degenerate fermions able to mimic the BH, which is surrounded by a more dilute atmosphere that isconsistent with the dark matter (DM) halo of the Galaxy. In this work we study the dynamics of the mostimportant star in the S-cluster, assuming that it moves around the compact DM core predicted by the RARmodel. For the first time we fit the orbital parameters of the S-2 star with a Markov Chain Monte Carlo (MCMC)technique, and compare the results with the ones obtained in the BH paradigm