GeV gamma-ray attenuation and the high-redshift UV background
作者： Piero Madau , Joel R. Primack , Francesco Haardt , Rachel S. Somerville , Rudy C. Gilmore
DOI: 10.1111/J.1365-2966.2009.15392.X
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摘要: We present new calculations of the evolving UV background out to epoch cosmological reionization and make predictions for amount GeV gamma-ray attenuation by electron-positron pair production. Our results are based on recent semi-analytic models galaxy formation, which provide dust-extinguished radiation field due starlight, empirical estimates contribution quasars. account reprocessing ionizing photons intergalactic medium. test whether our can reproduce at high redshift from flux decrement analysis proximity effect measurements quasar spectra, identify a range that satisfy these constraints. Pair production against soft diffuse leads spectral cut-off feature gamma rays observed between 10 100 GeV. This varies with assumed star formation evolution models. find only negligible amounts absorption below any emission redshift. With observations high-redshift sources in sufficient numbers Fermi Gamma-ray Space Telescope ground-based instruments, it should be possible constrain extragalactic light optical portion spectrum.
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