Attenuation of VHE Gamma Rays by the Milky Way Interstellar Radiation Field

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The attenuation of very high energy gamma rays by pair production on the Galactic interstellar radiation field has long been thought of as negligible. However, a new calculation of the interstellar radiation field consistent with multi-wavelength observations by DIRBE and FIRAS indicates that the energy density of the Galactic interstellar radiation field is higher, particularly in the Galactic center, than previously thought. We have made a calculation of the attenuation of very high energy gamma rays in the Galaxy using this new interstellar radiation field which takes into account its nonuniform spatial and angular distributions. We find that the maximum ... continued below

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3 pages

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Moskalenko, Igor V.; /Stanford U., HEPL; Porter, Troy A.; U., /Louisiana State; Strong, Andrew W. & /Garching, Max Planck Inst., MPE April 19, 2006.

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The attenuation of very high energy gamma rays by pair production on the Galactic interstellar radiation field has long been thought of as negligible. However, a new calculation of the interstellar radiation field consistent with multi-wavelength observations by DIRBE and FIRAS indicates that the energy density of the Galactic interstellar radiation field is higher, particularly in the Galactic center, than previously thought. We have made a calculation of the attenuation of very high energy gamma rays in the Galaxy using this new interstellar radiation field which takes into account its nonuniform spatial and angular distributions. We find that the maximum attenuation occurs around 100 TeV at the level of about 25% for sources located at the Galactic center, and is important for both Galactic and extragalactic sources.

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3 pages

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  • Journal Name: Astrophysical Journal; Journal Volume: 640

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  • Report No.: SLAC-PUB-11742
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 881539
  • Archival Resource Key: ark:/67531/metadc885642

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  • April 19, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 6, 2016, 7:09 p.m.

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Moskalenko, Igor V.; /Stanford U., HEPL; Porter, Troy A.; U., /Louisiana State; Strong, Andrew W. & /Garching, Max Planck Inst., MPE. Attenuation of VHE Gamma Rays by the Milky Way Interstellar Radiation Field, article, April 19, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc885642/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.