Hinting a dark matter nature of Sgr A* via the S-stars. (arXiv:2105.06301v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Becerra_Vergara_E/0/1/0/all/0/1">E. A. Becerra-Vergara</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Arguelles_C/0/1/0/all/0/1">C. R. Argüelles</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Krut_A/0/1/0/all/0/1">A. Krut</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rueda_J/0/1/0/all/0/1">J. A. Rueda</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ruffin_R/0/1/0/all/0/1">R. Ruffin</a>
The motion data of the S-stars around the Galactic center gathered in the
last 28 yr imply that Sgr A* hosts a supermassive compact object of about
$4times 10^6$ $Modot$, a result awarded with the Nobel Prize in Physics 2020.
A non-rotating black hole (BH) nature of Sgr A* has been uncritically adopted
since the S-star orbits agree with Schwarzschild geometry geodesics. The orbit
of S2 has served as a test of General Relativity predictions such as the
gravitational redshift and the relativistic precession. The central BH model
is, however, challenged by the G2 post-peripassage motion and by the lack of
observations on event-horizon-scale distances robustly pointing to its univocal
presence. We have recently shown that the S2 and G2 astrometry data are better
fitted by geodesics in the spacetime of a self-gravitating dark matter (DM)
core – halo distribution of 56 keV-fermions, “darkinos”, which also explains
the outer halo Galactic rotation curves. This Letter confirms and extends this
conclusion using the astrometry data of the $17$ best-resolved S-stars, thereby
strengthening the alternative nature of Sgr A* as a dense core of darkinos.
The motion data of the S-stars around the Galactic center gathered in the
last 28 yr imply that Sgr A* hosts a supermassive compact object of about
$4times 10^6$ $Modot$, a result awarded with the Nobel Prize in Physics 2020.
A non-rotating black hole (BH) nature of Sgr A* has been uncritically adopted
since the S-star orbits agree with Schwarzschild geometry geodesics. The orbit
of S2 has served as a test of General Relativity predictions such as the
gravitational redshift and the relativistic precession. The central BH model
is, however, challenged by the G2 post-peripassage motion and by the lack of
observations on event-horizon-scale distances robustly pointing to its univocal
presence. We have recently shown that the S2 and G2 astrometry data are better
fitted by geodesics in the spacetime of a self-gravitating dark matter (DM)
core – halo distribution of 56 keV-fermions, “darkinos”, which also explains
the outer halo Galactic rotation curves. This Letter confirms and extends this
conclusion using the astrometry data of the $17$ best-resolved S-stars, thereby
strengthening the alternative nature of Sgr A* as a dense core of darkinos.
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