Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-08-31
Astronomy and Astrophysics
Astrophysics
12 pages, 2 figures, accepted for publication in Ap.J.(Lett.)
Scientific paper
10.1086/312308
The recent detection of gamma radiation from Mkn 501 at energies as high as 25 TeV suggests stringent upper bounds on the diffuse, far infrared, extragalactic radiation density. The production of electron-positron pairs through photon-photon collisions would prevent gamma photons of substantially higher energies from reaching us across distances of order 100 Mpc. However, coherently arriving TeV or sub-TeV gammas - Bose-Einstein condensations of photons at these energies - could mimic the Cherenkov shower signatures of extremely energetic gammas. To better understand such events, we describe their observational traits and discuss how they might be generated.
Biermann Peter L.
Harwit Martin
Protheroe Raymond J.
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