Gamma ray astronomy and baryonic dark matter

Details Gamma ray astronomy and baryonic dark matter Gamma ray astronomy and baryonic dark matter

1999-01-05

arxiv.org/abs/astro-ph/9901033v1

Astrophys.J.510:L103,1999

Astronomy and Astrophysics

Astrophysics

9 pages, 1 figure included, to appear in ApJ 510, L103 (1999)

Scientific paper

10.1086/311816

Recently, Dixon et al. have re-analyzed the EGRET data, finding a statistically significant diffuse $\gamma$-ray emission from the galactic halo. We show that this emission can naturally be explained within a previously-proposed model for baryonic dark matter, in which $\gamma$-rays are produced through the interaction of high-energy cosmic-ray protons with cold $H_2$ clouds clumped into dark clusters - these dark clusters supposedly populate the outer galactic halo and can show up in microlensing observations. Our estimate for the halo $\gamma$-ray flux turns out to be in remarkably good agreement with the discovery by Dixon et al. We also address future prospects to test our predictions.

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