All-sky Limits on Sterile Neutrino Galactic Dark Matter Obtained with SRG/ART-XC after Two Years of Operations

E. I. Zakharov,V. V. Barinov,R. A. Burenin,D. S. Gorbunov,R. A. Krivonos,A. Yu Tkachenko,V. A. Arefiev,E. V. Filippova,S. A. Grebenev,A. A. Lutovinov, I. A. Mereminsky,S. Yu Sazonov,A. N. Semena,A. E. Shtykovsky,R. A. Sunyaev

PHYSICAL REVIEW D（2024）

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Abstract

Dark matter sterile neutrinos radiatively decay in the Milky Way, which can be tested with searches for almost monochromatic photons in the x-ray cosmic spectrum. We analyse the data of SRG/ART-XC telescope operated for two years in the all-sky survey mode. With no significant hints in the Galactic diffuse x-ray spectrum we explore models with sterile neutrino masses in 12-40 keV range and exclude corresponding regions of sterile-active neutrino mixing.

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