The Race Between Stars and Quasars in Reionizing Cosmic Hydrogen

Details The Race Between Stars and Quasars in Reionizing Cosmic Hydrogen The Race Between Stars and Quasars in Reionizing Cosmic Hydrogen

2008-11-13

arxiv.org/abs/0811.2222v2

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure, Accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2009/03/022

The cosmological background of ionizing radiation has been dominated by quasars once the Universe aged by ~2 billion years. At earlier times (redshifts z>3), the observed abundance of bright quasars declined sharply, implying that cosmic hydrogen was reionized by stars instead. Here, we explain the physical origin of the transition between the dominance of stars and quasars as a generic feature of structure formation in the concordance LCDM cosmology. At early times, the fraction of baryons in galaxies grows faster than the maximum (Eddington-limited) growth rate possible for quasars. As a result, quasars were not able to catch up with the rapid early growth of stellar mass in their host galaxies.

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