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Gamma rays with E>10 GeV interact with optical-UV photons through pair production. Therefore, a large sample of high redshift sources of these gamma rays can be used to probe the extragalactic background light (EBL) by examining the attenuation of the flux above 10 GeV. GLAST will detect thousands of gamma-ray blazars up to redshifts of at least z=4, with sufficient angular resolution to allow identification of many of their optical counterparts. By combining the gamma-ray blazar luminosity function, models of the high energy gamma-ray opacity due to EBL absorption, and the expected GLAST instrument performance to produce simulated redshifts and fluxes for blazars detected by GLAST, we demonstrate that these blazars have can be a highly effective probe of the EBL.

Detecting the attenuation of blazar gamma-ray emission by extragalactic background light with GLAST