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Cosmic Rays and Molecular Clouds

By S. Gabici

Abstract

ISBN 978-3-642-35409-0International audienceThis paper deals with the cosmic-ray penetration into molecular clouds and with the related gamma-ray emission. High energy cosmic rays interact with the dense gas and produce neutral pions which in turn decay into two gamma rays. This makes molecular clouds potential sources of gamma rays, especially if they are located in the vicinity of a powerful accelerator that injects cosmic rays in the interstellar medium. The amplitude and duration in time of the cosmic-ray overdensity around a given source depend on how quickly cosmic rays diffuse in the turbulent galactic magnetic field. For these reasons, gamma-ray observations of molecular clouds can be used both to locate the sources of cosmic rays and to constrain the properties of cosmic-ray diffusion in the Galaxy

Topics: Physics, [ PHYS.ASTR.HE ] Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], [ SDU.ASTR.HE ] Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]
Publisher: Springer
Year: 2012
DOI identifier: 10.1007/978-3-642-35410-6_16
OAI identifier: oai:HAL:hal-00908271v1
Provided by: Hal-Diderot
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