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arXiv:astro-ph/0011013 (astro-ph)
[Submitted on 1 Nov 2000]

Title:Evolving Stellar Background Radiation and Gamma-Ray Optical Depth

Authors:T.M. Kneiske, K. Mannheim, D. Hartmann
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Abstract: We present a semi-empirical model for the evolving far-infrared to ultraviolet diffuse background produced by stars in galaxies. The model is designed to reproduce the results of deep galaxy surveys, and therefore may be considered as a cosmology-independent lower limit to the extragalactic background light. Using this model and recent HEGRA data, we infer the intrinsic spectrum at multi-TeV gamma-ray energies for Mkn501 and find that it is consistent with a power law of spectral index 2.49+-0.04. In turn, this finding renders it rather unlikely that the present-day infrared background has an intensity as high as claimed by Finkbeiner et al. (2000). Future 10GeV to TeV observations could be used to either constrain the ultraviolet-to-infrared background model at high redshifts or cosmological parameters.
Comments: 4 pages, 5 figures, to appear in the Proc. of the Heidelberg International Symposium on High Energy Gamma-Ray Astronomy, Heidelberg, June 26-30, 2000, ed. by H.J. Voelk and F. Aharonian, AIP Conf. Proc
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0011013
  (or arXiv:astro-ph/0011013v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0011013
Related DOI: https://doi.org/10.1063/1.1370894

Submission history

From: Tanja M. Kneiske [view email]
[v1] Wed, 1 Nov 2000 15:04:42 UTC (31 KB)
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