New constraints on sterile neutrino dark matter from the Galactic Center

2018/10/12 by Yunis, R., Argüelles, C. R., Mavromatos, N. E. +4
#Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.1810.05756

Abstract

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-Argüelles-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∼ 10-15 keV, when analyzed within the νMSM 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.

Related

• Detection of Dark Matter Decay in the X-ray
• Cosmological constraints on sterile neutrino Dark Matter production mechanisms
• Dark matter decay in the Milky Way halo
• Dark Matter at the Center and in the Halo of the Galaxy
• Bounds on Resonantly-Produced Sterile Neutrinos from Phase Space Densities of Milky Way Dwarf Galaxies