期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 725, 期 2, 页码 L131-L134出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/725/2/L131
关键词
dark matter; line: identification; neutrinos
资金
- STFC [ST/H002456/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H002456/1] Funding Source: researchfish
Sterile neutrinos (or right-handed neutrinos) are a plausible warm dark matter candidate. We find that the excess of the intensity in the 8.7 keV line (at the energy of the Fe XXVI Ly gamma line) in the spectrum of the Galactic center observed by Suzaku cannot be explained by standard ionization and recombination processes. We suggest that the origin of this excess is via decays of sterile neutrinos with a mass of 17.4 keV. The estimated value of the mixing angle sin(2)(2 theta) = (4.4 +/- 2.2) x 10(-12) lies in the allowed region of the mixing angle for a dark matter sterile neutrino with a mass of 17-18 keV.
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