Intergalactic Extinction of High Energy Gamma-Rays

Preprint

19 January 1999

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/9812286

Abstract

We discuss the determination of the intergalactic pair-production absorption coefficient (Stecker & De Jager 1998) making use of an empirically based calculation of the IR background spectrum (Malkan & Stecker 1998) which agrees well with recent data and constraints on the IR background. While the Whipple observations of Mrk421 hint at extragalactic absorption, the new HEGRA observations of Mrk501 appear to strongly indicate such absorption. We discuss the determination of absorption at higher redshifts (Salamon & Stecker 1998). We also give a predicted spectrum, with absorption included, for PKS2155-304, which, at a redshift of 0.12, is the highest redshift TeV source yet observed.

Keywords

DISCUSS THE DETERMINATION
INTERGALACTIC EXTINCTION
IR BACKGROUND
ENERGY GAMMA
ABSORPTION
GAMMA RAYS
REDSHIFT
SPECTRUM
STECKER

All Related Versions

Version 1, 1998-12-15, ArXiv
Version 2, 1999-01-19, ArXiv
Version 1, 1999-04-29, ArXiv (Unconfirmed version)
Published version: Astroparticle Physics, 11 (1-2), 83.

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