The very first Pop III stars and their relation to bright z~6 quasars

Details The very first Pop III stars and their relation to bright z~6 quasars The very first Pop III stars and their relation to bright z~6 quasars

2007-10-04

arxiv.org/abs/0710.1032v1

AIPConf.Proc.990:494-498,2008

Astronomy and Astrophysics

Astrophysics

5 pages, to appear in the proceedings of "First Stars III", AIP Conference Series, T. Abel, A. Heger and B. O'Shea eds

Scientific paper

10.1063/1.2905670

We discuss the link between dark matter halos hosting the first PopIII stars formed at redshift z > 40 and the rare, massive, halos that are generally considered to host bright z~6 quasars. We show that within the typical volume occupied by one bright high-z QSO the remnants of the first several thousands PopIII stars formed do not end up in the most massive halos at z~6, but rather live in a large variety of environments. The black hole seeds planted by these very first PopIII stars can easily grow to M > 10^{9.5} Msun by z=6 assuming Eddington accretion with radiative efficiency epsilon~0.1. Therefore quenching of the accretion is crucial to avoid an overabundance of supermassive black holes. We implement a simple feedback model for the growth of the seeds planted by PopIII stars and obtain a z~6 BH mass function consistent with the observed QSO luminosity function.

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