An infrared background--TeV gamma-ray crisis?

Details An infrared background--TeV gamma-ray crisis? An infrared background--TeV gamma-ray crisis?

2000-05-17

arxiv.org/abs/astro-ph/0005349v3

Phys.Lett. B493 (2000) 1-6

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figures, Accepted for publication in Physics Letters B. Minor changes

Scientific paper

10.1016/S0370-2693(00)01113-8

We consider the implications of the recent determination of the universal infrared background for the propagation of photons up to 20 TeV from the active galaxy Markarian 501 as observed by HEGRA. At 20 TeV the mean free path for photon-photon collisions on the infrared background would be much shorter than the distance to Markarian 501, implying absorption factors of the order of exp(-10), or greater, and consequently an excessive power output for this active galaxy. Possible solutions of this problem are discussed.

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