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• W3125476501 startingPage "41" @default.
• W3125476501 abstract "Very high energy gamma-rays from blazars traversing cosmological distances through the metagalactic radiation field can convert into electron-positron pairs in photon-photon collisions. The converted gamma-rays initiate electromagnetic cascades driven by inverse-Compton scattering off the microwave background photons. Using a model for the time-dependent metagalactic radiation field consistent with all currently available far-infrared-to-optical data, we calculate the cascade contribution from faint, unresolved high- and low-peaked blazars to the extragalactic gamma-ray background as measured by EGRET. For low-peaked blazars, we adopt a spectral index consistent with the mean spectral index of EGRET detected blazars, and the EGRET luminosity function. For high-peaked blazars, we adopt template spectra matching prototype sources observed with air-Cherenkov telescopes up to 30 TeV, and a luminosity function based on X-ray measurements. The low number of ∼20 for nearby high-peaked blazars with a flux exceeding above 300 GeV inferred from the luminosity function is consistent with the results from air-Cherenkov telescope observations. Including the cascade emission from higher redshifts, the total high-peaked blazar contribution to the observed gamma-ray background at GeV energies can account for ~30%." @default.
• W3125476501 created "2021-02-01" @default.
• W3125476501 creator A5011730868 @default.
• W3125476501 creator A5091906254 @default.
• W3125476501 date "2007-11-12" @default.
• W3125476501 modified "2023-09-23" @default.
• W3125476501 title "BL Lacertae contribution to the extragalactic gamma-ray background" @default.
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• W3125476501 doi "https://doi.org/10.1051/0004-6361:20065605" @default.
• W3125476501 hasPublicationYear "2007" @default.
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