Constraints on the cosmic ray diffusion coefficient in the W28 region from gamma-ray observations

Details Constraints on the cosmic ray diffusion coefficient in the W28 region from gamma-ray observations Constraints on the cosmic ray diffusion coefficient in the W28 region from gamma-ray observations

2010-09-27

arxiv.org/abs/1009.5291v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

To appear in the proceedings of "Journ\'ees de la SF2A 2010" Marseille 21-24 June 2010, 4 pages, 4 figures

Scientific paper

GeV and TeV gamma rays have been detected from the supernova remnant W28 and its surroundings. Such emission correlates quite well with the position of dense and massive molecular clouds and thus it is often interpreted as the result of hadronic cosmic ray interactions in the dense gas. Constraints on the cosmic ray diffusion coefficient in the region can be obtained, under the assumption that the cosmic rays responsible for the gamma ray emission have been accelerated in the past at the supernova remnant shock, and subsequently escaped in the surrounding medium. In this scenario, gamma ray observations can be explained only if the diffusion coefficient in the region surrounding the supernova remnant is significantly suppressed with respect to the average galactic one.

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