Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-02-17
Astronomy and Astrophysics
Astrophysics
7 pages, 2 figures; slightly modified version of article to appear in Proc. of the "International Symposium on High Energy Gam
Scientific paper
10.1063/1.1878464
It is shown that inverse Compton gamma-rays from electrons accelerated in large scale structure formation shocks can be crucially affected by non-gravitational effects such as radiative cooling and galaxy formation, with corresponding uncertainties by an order of magnitude in either the gamma-ray source counts or the extragalactic background contribution. However, this also implies that such gamma-rays may in the near future provide us with valuable information about the fraction of cosmic baryons in different forms, particularly the warm-hot intergalactic medium where the majority of the baryons in the universe are believed to reside. We address this problem in a simple way through semi-analytic modeling of structure formation shocks which self-consistently treats merger and accretion shocks.
Inoue Susumu
Nagashima Masahiro
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