Testing the origin of the extragalactic gamma ray background by modelling its high energy spectrum

Details Testing the origin of the extragalactic gamma ray background by modelling its high energy spectrum Testing the origin of the extragalactic gamma ray background by modelling its high energy spectrum

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...344..744w&link_type=abstract

Astronomy and Astrophysics, v.344, p.744-748 (1999)

Astronomy and Astrophysics

Astrophysics

5

Galaxies: Active, Cosmology: Diffuse Radiation, Gamma Rays: Theory

Scientific paper

The origin of the Extragalactic Gamma Ray Background (EGRB) is still a matter of discussion. With the increasing number of detected gamma ray point sources, it becomes increasingly likely that the seemingly diffuse EGRB is a superposition of the radiation of still unresolved point sources. Most models describe the gamma radiation of these point sources in accordance with the Unified Scheme (US) of Active Galactic Nuclei (AGN) as generated through a process of inverse Compton scattering in relativistically beamed plasma blobs in blazars. Earlier theoretical calculations of the contribution of these point sources to the EGRB have failed to consider the anisotropic beaming characteristics of the blazars. We show that it is possible to model the EGRB on the basis of the assumption that it is generated by unresolved blazars when these anisotropic effects are properly taken into account. Furthermore we demonstrate, using the example of an idealised blazar model, that predictions of the EGRB-spectrum at high energies can be made, which can in principle be used to test whether the EGRB is generated by unresolved blazars. We argue that the principle of that test applies not only to blazars, but also to every possible point source with anisotropic beaming pattern.

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