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

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

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..510..759c&link_type=abstract

THE FIFTH COMPTON SYMPOSIUM. AIP Conference Proceedings, Volume 510, pp. 759-763 (2000).

Computer Science

Performance

X- And Gamma-Ray Telescopes And Instrumentation, Active And Peculiar Galaxies And Related Systems

Scientific paper

Gamma rays with energy above 10 GeV interact with optical-UV photons resulting in pair production. Therefore, a large sample of high redshift sources of these gamma rays can be used to probe the extragalactic background starlight (EBL) by examining the redshift dependence of the attenuation of the flux above 10 GeV. GLAST, the next generation high-energy gamma-ray telescope, will for the first time have the unique capability to detect thousands of gamma-ray blazars up to redshifts of at least z=4, with enough angular resolution to allow identification of a large fraction of their optical counterparts. By combining recent determinations of the gamma-ray blazar luminosity function, recent calculations of the high energy gamma-ray opacity due to EBL absorption, and the expected GLAST instrument performance to produce simulated samples of blazars that GLAST would detect, including their redshifts and fluxes, we demonstrate that these blazars have the potential to be a highly effective probe of the EBL. .

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