The Cosmic Star Formation Rate from the Faintest Galaxies in the Unobservable Universe

Andrew M. Hopkins (Australian Astronomical Observatory); Hasan Yuksel; Matthew D. Kistler (Lawrence Berkeley National Laboratory; UC Berkeley)

The Cosmic Star Formation Rate from the Faintest Galaxies in the Unobservable Universe

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arxiv 1305.1630 v1 pith:TOWCFZGR submitted 2013-05-07 astro-ph.CO astro-ph.GAastro-ph.HE

The Cosmic Star Formation Rate from the Faintest Galaxies in the Unobservable Universe

Matthew D. Kistler (Lawrence Berkeley National Laboratory , UC Berkeley) , Hasan Yuksel , Andrew M. Hopkins (Australian Astronomical Observatory) This is my paper

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keywords galaxiesformationratestardensitygrbshoweverlower

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Observations of high-z galaxies and gamma-ray bursts now allow for empirical studies during reionization. However, even deep surveys see only the brightest galaxies at any epoch and must extrapolate to arbitrary lower limits to estimate the total rate of star formation. We first argue that the galaxy populations seen in LBG surveys yield a GRB rate at z > 8 that is an order of magnitude lower than observed. We find that integrating the inferred UV luminosity functions down to M_UV ~ -10 brings LBG- and GRB-inferred SFR density values into agreement up to z ~ 8. GRBs, however, favor a far larger amount of as yet unseen star formation at z > 9. We suggest that the SFR density may only slowly decline out to z ~ 11, in accord with WMAP and Planck reionization results, and that GRBs may be useful in measuring the scale of this multitude of dwarf galaxies.

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