Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-10-14
Proc. Kruger Natl. Park Symp. on TeV Gamma Ray Astr., ed. O.C. de Jager (1997) pg. 39
Astronomy and Astrophysics
Astrophysics
11 pages Latex, 5 figures, Invited paper to be published in Proc. Kruger Park Intl. Workshop on TeV Gamma-Ray Astrophysics
Scientific paper
We discuss the problem of the absorption of very high-energy gamma-rays by pair production interactions with extragalactic photons which originate from stellar emission in the near IR-UV and reradiation of starlight in the mid- and far-IR. The absorption of gamma-rays above 1 TeV is dominated by interactions with infrared photons. We make a new determination of the optical depth of the universe to multi-TeV photons as a function of energy and redshift and use the results to compare with recent spectral data of Mrk 421 and Mrk 501, sources that have been observed in the flaring state up to apx. 10 TeV energy. For the optical depth calculations, we have made use of a new, empirically based calculation of the intergalactic radiation field by Malkan & Stecker which we consider to be more accurate than that based on previous theoretical modeling. We also discuss the absorption of sub-TeV gamma-rays by starlight photons at high redshifts.
de Jager Ocker C.
Stecker Floyd W.
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