Extragalactic Very-High-Energy gamma-ray background

Details Extragalactic Very-High-Energy gamma-ray background Extragalactic Very-High-Energy gamma-ray background

2011-03-17

arxiv.org/abs/1103.3484v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 6 figures

Scientific paper

We study extragalactic very-high-energy (VHE) diffuse gamma-ray background in 10-400 GeV energy range using the data of Fermi telescope. To estimate the background level, we count VHE photons at high Galactic latitudes |b|>60 deg. Subtracting photons associated to known sources and the residual cosmic ray and Galactic diffuse backgrounds, we estimate the VHE Extragalactic Gamma-ray Background (EGB) flux. We find that the spectrum of VHE EGB closely follows the stacked spectrum of BL Lacs. LAT data reveal positive (1+z)^k, 110 GeV could be completely explained by emission from unresolved BL Lacs if k~3.

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