Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21011205s&link_type=abstract
American Astronomical Society Meeting 210, #112.05; Bulletin of the American Astronomical Society, Vol. 39, p.236
Astronomy and Astrophysics
Astronomy
Scientific paper
We calculate the optical depth of the universe for gamma-rays having energies between 4 GeV and 100 TeV emitted by sources at redshifts from 0 to 5. Absorption of high energy gamma-rays in intergalactic space is due to interactions with the cosmic background radiation and low energy photons. We calculate the intergalactic photon density in a ΛCDM universe consistent with the most recent WMAP findings as a function of both energy and redshift for 0 < z < 6 and for photon energies from .003 eV up to the Lyman limit cutoff at 13.6 eV. Our evolution model is consistent with Spitzer deep number counts and the spectral energy distribution of the extragalactic background radiation. From our optical depth results, we derive a simple analytic approximation for determining the effect of intergalactic absorption for 0.01 < Ï,, < 100 and for gamma-ray energies up to 2 TeV for all redshifts but also for energies up to 10 TeV for redshifts less than 1. We show the utility of this approximation by applying it to the spectra of seven TeV blazers.
Scully Sean
Stecker Floyd
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