An Upper Limit on the Infrared Background Density from HEGRA data on Mkn501

Abstract

The energy spectrum of Mkn501 in the TeV energy regime, as measured by the HEGRA (High Energy Gamma Ray Astronomy) Cerenkov telescopes during its low state in 1995/96 and during a fraction of the 1997 outburst in the TeV energy regime, is shown to place stringent upper limits on the still unknown infrared photon density in the energy region between 3 x 10**(-3) and 3 xt 10**(-1) eV. Assuming two different shapes for the unknown infrared photon spectrum in this energy range we calculate upper limits on the infrared photon density on the basis of the power-law fit obtained for the observed spectrum up to the maximum energy.

11 pages, 6 Postscript figures, Accepted for publication in Astroparticle Physics

References in corpus (4)

• Constraints on the Extragalactic Infrared Background from Gamma Ray Observations of Mrk 501
• The optically-dark side of galaxy formation
• Cosmic Emissivity and Background Intensity from Damped Lyman-Alpha Galaxies
• 50 TeV HEGRA Sources and Infrared Radiation

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