Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-04-20
Astron.Astrophys.334:L85,1998
Astronomy and Astrophysics
Astrophysics
4 latex pages plus 3 ps file figures, To be published as a letter in Astronomy and Astrophysics
Scientific paper
We present a new calculation of the intergalactic gamma-ray absorption coefficient as a function of both energy and redshift. In reexamining this problem, we make use of a new, empirically based calculation (as opposed to previous model calculations) of the intergalactic infrared radiation field. We find smaller opacities than those given previously (Stecker & De Jager 1997). We apply our results to the new observations of the flaring gamma-ray spectra of Mrk421 and Mrk501, both at a redshift of apx. 0.03. Our new calculations indicate that there should be no significant curvature in the spectra of these sources for energies below 10 TeV, as indicated by recent observations. However, the intrinsic spectra of these sources should be harder by apx. 0.2 to 0.45 in the spectral index in the 1 to 10 TeV range with an intergalactic absorption cutoff above apx. 20 TeV.
de Jager Ocker C.
Stecker Floyd W.
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