Constraints on cosmological parameters from the EBL attenuation of VHE spectra of extragalactic sources

Details Constraints on cosmological parameters from the EBL attenuation of VHE spectra of extragalactic sources Constraints on cosmological parameters from the EBL attenuation of VHE spectra of extragalactic sources

2009-08-31

arxiv.org/abs/0908.4582v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 2 figures, contribution to the 31st ICRC, Lodz, Poland, July 2009

Scientific paper

The Extragalactic Background Light (EBL) causes attenuation of the VHE spectra of extragalactic sources, via pair-production. The amount of attenuation depends on the distance of the source, i.e. on the integration over the line of sight path taken by the VHE photons. The line of sight path calculation, depends on the values of the cosmological parameters and the evolution of these parameters. With the recent indications of a lower EBL level from observations and the greater sensitivity of the proposed future Cherenkov experiments it will be possible to detect higher redshift sources. We study whether the EBL attenuation of extragalactic sources is sensitive enough to put constrains on the cosmological parameters.

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