Gamma rays from molecular clouds

Details Gamma rays from molecular clouds Gamma rays from molecular clouds

2006-10-02

arxiv.org/abs/astro-ph/0610032v1

Astrophys.SpaceSci.309:365-371,2007

Astronomy and Astrophysics

Astrophysics

Proceeding of "The multi messenger approach to high energy gamma ray sources", Barcelona, June 2006

Scientific paper

10.1007/s10509-007-9427-6

It is believed that the observed diffuse gamma ray emission from the galactic plane is the result of interactions between cosmic rays and the interstellar gas. Such emission can be amplified if cosmic rays penetrate into dense molecular clouds. The propagation of cosmic rays inside a molecular cloud has been studied assuming an arbitrary energy and space dependent diffusion coefficient. If the diffusion coefficient inside the cloud is significantly smaller compared to the average one derived for the galactic disk, the observed gamma ray spectrum appears harder than the cosmic ray spectrum, mainly due to the slower penetration of the low energy particles towards the core of the cloud. This may produce a great variety of gamma ray spectra.

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