Author:
Sinitsyna V.G.,Sinitsyna V.Y.,Borisov S.S.,Balygin K.A.,Klimov A.I.,Mirzafatikhov R.M.,Moseiko N.I.,Ostashev I.E.
Abstract
Abstract
The cosmological processes including the history of stars and galaxies formation will be observed in the energy spectrum of Extragalactic Background Light (EBL) radiation. Observations of the very high energy γ-ray sources at redshifts from z = 0.018 up to z = 2.979 with SHALON telescopes gives an opportunity to constrain the EBL density, as the TeV γ-rays can be absorbed due to interaction of low-energy photons of EBL. The detection of TeV γ-ray sources at high redshifts is the evidence of less average spectral density of EBL and thus the less star formation rate at early evolution stage as well as the less expansion rate of the universe, than it is previously believed.
Subject
General Physics and Astronomy