We propose a new signature for weakly interacting massive particle (WIMP) dark matter, a spectral feature in the diffuse extragalactic gamma-ray radiation. This feature, a sudden drop of the gamma-ray intensity at an energy corresponding to the WIMP mass, comes from the asymmetric distortion of the line due to WIMP annihilation into two gamma rays caused by the cosmological redshift. Unlike other proposed searches for a line signal, this method is not very sensitive to the exact dark matter density distribution in halos and subhalos.

Spectral gamma-ray signatures of cosmological dark matter annihilations / L., Bergstrom; J., Edsjo; Ullio, Piero. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 87:25(2001), pp. 251301.1-251301.4. [10.1103/PhysRevLett.87.251301]

Spectral gamma-ray signatures of cosmological dark matter annihilations

Ullio, Piero
2001

Abstract

We propose a new signature for weakly interacting massive particle (WIMP) dark matter, a spectral feature in the diffuse extragalactic gamma-ray radiation. This feature, a sudden drop of the gamma-ray intensity at an energy corresponding to the WIMP mass, comes from the asymmetric distortion of the line due to WIMP annihilation into two gamma rays caused by the cosmological redshift. Unlike other proposed searches for a line signal, this method is not very sensitive to the exact dark matter density distribution in halos and subhalos.
87
25
1
4
251301
https://doi.org/10.1103/PhysRevLett.87.251301
https://arxiv.org/abs/astro-ph/0105048
L., Bergstrom; J., Edsjo; Ullio, Piero
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/14354
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