Hinting a dark matter nature of Sgr A* via the S-stars
  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
$4\times 10^6$ $M\odot$, 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.
