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A Simple Analytic Treatment of the Intergalactic Absorption Effect in Blazar Gamma-Ray Spectra
2006
Astrophysical Journal
We derive a new and user friendly simple analytic approximation for determining the effect of intergalactic absorption in the energy range 0.2-2 TeV and the redshift range 0.05-0.4. In these ranges, the form of the absorption coeeficient is approximately logarithmic in energy. The effect of this energy dependence is to steepen intrinsic source spectra such that a source with an approximate power-law intrinsic spectrum in this energy range with spectral index Γ_s is steepened to a power-law with
doi:10.1086/509885
fatcat:smsjwvlyfvawfowhqdxwsxuzi4