H2 dark matter in the galactic halo from EGRET

Details H2 dark matter in the galactic halo from EGRET H2 dark matter in the galactic halo from EGRET

1999-09-03

arxiv.org/abs/astro-ph/9909068v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, to be published in A&A letters

Scientific paper

We present a model for the interpretation of the gamma-ray background emission from the Galactic halo, which we attribute to interaction of high-energy cosmic rays with dense molecular clumps. In a wide range of clump parameters we calculate the expected gamma-photon flux, taking into account for the first time optical depth effects. This allows us to derive new constraints on masses and sizes of possible molecular clumps and their contribution to the galactic surface density. The observed gamma-ray distribution can be explained best by models with a flattened halo distribution of axis ratio ~ 0.3. If optical depth effects are important, the clumps must have radii of ~ 6 AU and masses of ~ 10^{-3} M_sun. This would result in a total mass of ~ 2 10^{11} M_sun for such clumps and contribute with Sigma ~ 140 M_sun pc^{-2} to the local surface density.

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