Gamma rays from molecular clouds

Aharonian, F. A.

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Gamma rays from molecular clouds

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Aharonian, F. A.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Aharonian, F. A. (2001). Gamma rays from molecular clouds. Space Science Reviews, 99(1-4), 187-196.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-8569-C

Abstract

High energy gamma-rays from individual giant molecular clouds contain unique information about the hidden sites of acceleration of galactic cosmic rays, and provide a feasible method for study of propagation of cosmic rays in the galactic disk on scales less than or equal to100 pc. I discuss the spectral features of pi(0)-decay gamma-radiation from clouds/targets located in proximity of relatively young proton accelerators, and speculate that such `accelerator+target' systems in our Galaxy can be responsible for a subset of unidentified EGRET sources. Also, I argue that the recent observations of high energy gamma-rays from the Orion complex contain evidence that the level of the `sea' of galactic cosmic rays may differ significantly from the flux and the spectrum of local (directly detected) particles.