The Extragalactic Background Light and Absorption in Gamma Ray Spectra

Details The Extragalactic Background Light and Absorption in Gamma Ray Spectra The Extragalactic Background Light and Absorption in Gamma Ray Spectra

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.2701g&link_type=abstract

American Astronomical Society, HEAD meeting #10, #27.01

Astronomy and Astrophysics

Astronomy

Scientific paper

Recent state-of-the-art semi-analytic models (SAMs) can now accurately model the history of galaxy formation and evolution. These SAMs utilize a 'forward evolution' approach and include all of the important processes for determining photon emission from galaxies, such as cooling and shock heating of gas, galaxy mergers, star formation and aging, supernova and AGN feedback, and the reprocessing of light by dust. I will be presenting our group's latest prediction of the extra-galactic background light based on this work and will discuss the implications for the attenuation of VHE gamma rays from distant sources due to pair-production. These results will be compared to recent limits placed on the EBL by observations of GeV and TeV blazar spectra by experiments such as H.E.S.S., MAGIC and VERITAS. The implications for reconstructing the intrinsic spectra of distant blazars will be addressed.

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