Observational evidences for the existence of 17.4 keV decaying degenerate sterile neutrinos near the Galactic Center

Details Observational evidences for the existence of 17.4 keV decaying degenerate sterile neutrinos near the Galactic Center Observational evidences for the existence of 17.4 keV decaying degenerate sterile neutrinos near the Galactic Center

2010-09-29

arxiv.org/abs/1009.5872v1

ApJ, 727, L47, 2011

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

6 pages, submitted to ApJL

Scientific paper

We show that the existence of a degenerate halo of sterile neutrinos with rest mass of 17.4 keV near the Galactic Center can account for both the excess 8.7 keV emission observed by the $Suzaku$ mission and the power needed ($10^{40}$ erg s$^{-1}$) to maintain the high temperature of the hot gas (8 keV) near the Galactic Center. The required decay rate and mixing angle of the sterile neutrinos are $\Gamma \ge 5 \times 10^{-20}$ s$^{-1}$ and $\sin^22 \theta \sim 10^{-3}-10^{-4}$ respectively. These values are consistent with a low reheating temperature in the inflation model, and suggest the exciting possibility that the sterile - active neutrino oscillation can be visible in near future experiments.

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