The Galactic Interstellar Radiation Field with Applications to Astrophysical Gamma Ray Emission in the Galaxy

Details The Galactic Interstellar Radiation Field with Applications to Astrophysical Gamma Ray Emission in the Galaxy The Galactic Interstellar Radiation Field with Applications to Astrophysical Gamma Ray Emission in the Galaxy

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1863p&link_type=abstract

American Astronomical Society, HEAD meeting #9, #18.63; Bulletin of the American Astronomical Society, Vol. 38, p.392

Astronomy and Astrophysics

Astronomy

Scientific paper

The Galactic interstellar radiation field (ISRF) at UV/optical and infrared wavelengths is predominantly the result of emission by stars and scattering, absorption, and re-radiation of starlight by dust in the interstellar medium. Cosmic ray electrons can inverse Compton scatter these low energy photons, producing gamma-rays. The production of inverse Compton gamma-rays depends on the number density distribution of low energy photons, as well as the angular distribution. Conventionally, only the number density distribution of the ISRF has been calculated, and the angular distribution has been assumed to be isotropic. However, the ISRF is distinctly anisotropic, with the angular distribution varying with wavelength and position in the Galaxy. We describe our calculation of the ISRF which utilises recent data for the Galactic stellar distribution, dust distribution and properties, and give details on the angular distribution as a function of position and wavelength in the Galaxy. We apply our ISRF, and calculate the anisotropic inverse Compton emission from cosmic ray electrons propagating in the Galaxy.

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