Enrichment history of the universe as seen from GRB statistics

Yu. A. Shchekinov1,2* and E. O. Vasiliev*
1Department of Space Physics, Southern Federal University, Sorge 5, Rostov on Don, Russia
2Special Astrophysical Observatory RAS, Nizhny Arkhyz 369167, Russia
3Institute of Physics, Southern Federal University, Stachki 194, Rostov on Don, Russia

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Abstract

Estimates of the cosmic star formation history from the gammaray burst rate predict a very slow decline of star formation at higher redshift. This implicates that at a given redshift galaxies form stars with higher rate than inferred from rest-frame optical/UV measurements. We discuss here consequences of such an enhanced star formation for the chemical evolution and reionization history of the Universe.

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Keywords : star formation – cosmic history: gamma-ray bursts – host galaxies – enrichment – user guide.