Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-06-09
Mon.Not.Roy.Astron.Soc. 312 (2000) 33
Astronomy and Astrophysics
Astrophysics
6 pages TEX files, using mn.tex as macro
Scientific paper
10.1046/j.1365-8711.2000.03072.x
We explore some basic observational consequences of assuming that the dark matter in the Milky Way consists mainly of molecular clouds, and that cosmic rays can penetrate these clouds. In a favoured model of the clouds, this penetration would have the following consequences, all of which agree with observation: (i) cosmic ray nuclei would be fragmented when they enter a cloud, giving them a lifetime in the Galaxy of $10^{15}$ sec (for relativistic nuclei). (ii) Pionic $\gamma$ rays emitted by the clouds, after pp collisions, would have a flux in the galactic plane comparable to the flux from known sources for photon energies $> \sim 1$ Gev. (iii) The heat input into the clouds from cosmic rays would be re-radiated mainly in the far infra-red. The resulting radiation background agrees, in both intensity and spectrum in different directions, with a known excess in the far $i - r$ background of the galaxy over emission by warm dust.
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