Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231l..23c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. L23-L26.
Astronomy and Astrophysics
Astrophysics
5
Annihilation Reactions, Cosmic Rays, Cosmology, Gamma Ray Astronomy, Nuclear Astrophysics, Active Galactic Nuclei, Background Radiation, Dark Matter, X Ray Spectra
Scientific paper
Photino, one of the best-motivated cold dark matter (DM) candidates, has been proposed to annihilate in the Galaxy into high-energy (GeV) gamma-rays. It would be of cosmological and particle-physical importance if a characteristic feature of the diffuse cosmic gamma-ray spectrum could arise from this type of annihilation in the early universe after decoupling. Performing the cosmological integrations back into the universe with some assumptions, it is found that while this mechanism cannot reproduce the MeV-bump in the extragalactic gamma-ray background (EGB), it might contribute significantly to the EGB as a whole, especially in the low-energy region (0.1-1.0 MeV), which then might lower the possible angular fluctuations in the EGB due to other proposed EGB-generation mechanisms.
Cline David. B.
Gao Yi-Tian
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