Very high energy γ ray absorption by the galactic interstellar radiation field

Aims.We calculate the attenuation of very high energy γ rays from Galactic sources.Methods.A recent calculation of the Galactic interstellar radiation field shows that the infra-red radiation background near the Galactic Center is very intense. The attenuation of very high energy γ rays by this radi...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2006-04, Vol.449 (2), p.641-643
Main Authors: Zhang, J.-L., Bi, X.-J., Hu, H.-B.
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
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Summary:Aims.We calculate the attenuation of very high energy γ rays from Galactic sources.Methods.A recent calculation of the Galactic interstellar radiation field shows that the infra-red radiation background near the Galactic Center is very intense. The attenuation of very high energy γ rays by this radiation is strong and occurs at lower energies than previously thought.Results.Our result shows that the cutoff of the high energy γ ray spectrum begins at about 20 TeV and reaches about 10% for 50 TeV γ rays.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361:20054422