X-ray line signal from 7 keV axino dark matter decay
classification
✦ hep-ph
astro-ph.COastro-ph.GAastro-ph.HE
keywords
galaxyaxinodecaylinex-rayandromedaaroundaxion
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Recently a weak X-ray emission around E ~ 3.5 keV was detected in the Andromeda galaxy and various galaxy clusters including the Perseus galaxy cluster but its source has been unidentified. Axino, the superpartner of axion, with a mass 2E is suggested as a possible origin of the line with R-parity violating decay into photon and neutrino. Moreover, most of parameter space is consistent with recent observation by the BICEP2 experiment.
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