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# Title:Sterile neutrino dark matter bounds from galaxies of the Local Group

Abstract: We show that the canonical oscillation-based (non-resonant) production of sterile neutrino dark matter is inconsistent at $>99$% confidence with observations of galaxies in the Local Group. We set lower limits on the non-resonant sterile neutrino mass of $2.5$ keV (equivalent to $0.7$ keV thermal mass) using phase-space densities derived for dwarf satellite galaxies of the Milky Way, as well as limits of $8.8$ keV (equivalent to $1.8$ keV thermal mass) based on subhalo counts of $N$-body simulations of M 31 analogues. Combined with improved upper mass limits derived from significantly deeper X-ray data of M 31 with full consideration for background variations, we show that there remains little room for non-resonant production if sterile neutrinos are to explain $100$% of the dark matter abundance. Resonant and non-oscillation sterile neutrino production remain viable mechanisms for generating sufficient dark matter sterile neutrinos.
 Comments: 10 pages, 4 figures, 2 tables. Submitted to PRD Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics - Phenomenology (hep-ph) Journal reference: Phys. Rev. D 89, 025017 (2014) DOI: 10.1103/PhysRevD.89.025017 Cite as: arXiv:1311.0282 [astro-ph.CO] (or arXiv:1311.0282v1 [astro-ph.CO] for this version)

## Submission history

From: Shunsaku Horiuchi [view email]
[v1] Fri, 1 Nov 2013 20:00:00 UTC (268 KB)
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