New constraints on sterile neutrino dark matter from the Galactic Center
  We calculate the most stringent constraints up to date on the parameter space
for sterile neutrino warm dark matter models possessing a radiative decay
channel into X-rays. These constraints arise from the X-ray flux observations
from the Galactic center (central parsec), taken by the XMM and NuSTAR
missions. We compare the results obtained from using different dark matter
density profiles for the Milky Way, such as NFW, Burkert or Einasto, to that
produced by the Ruffini-Arg\"uelles-Rueda (RAR) fermionic model, which has the
distinct feature of depending on the particle mass. We show that due to the
novel core-halo morphology present in the RAR profile, the allowed particle
mass window is narrowed down to $m_s\sim 10-15$ keV, when analyzed within the
$\nu$MSM sterile neutrino model. We further discuss on the possible effects in
the sterile neutrino parameter-space bounds due to a self-interacting nature of
the dark matter candidates.
