The high-redshift star formation rate derived from GRBs: possible origin and cosmic reionization

Abstract

The collapsar model of long gamma-ray bursts (GRBs) indicates that they may trace the star formation history. So long GRBs may be a useful tool of measuring the high-redshift star formation rate (SFR). The collapsar model explains GRB formation via the collapse of a rapidly rotating massive star with $M>30M_{\odot }$ into a black hole, which may imply a decrease of SFR at high redshift. However, we find that the \emph{Swift} GRBs during 2005-2012 are biased tracing the SFR, including a factor about $(1+z{)}^{0.5}$, which is in agreement with recent results. After taking this factor, the SFR derived from GRBs does not show steep drop up to $z\sim 9.4$. We consider the GRBs produced by rapidly rotating metal-poor stars with low masses to explain the high-redshift GRB rate excess. The chemically homogeneous evolution scenario (CHES) of rapidly rotating stars with mass larger than $12M_{\odot }$ is recognized as a promising path towards collapsars in connection with long GRBs. Our results indicate that the stars in the mass range $12M_{\odot }<M<30M_{\odot }$ for low enough metallicity $Z\le 0.004$ with the GRB efficiency factor $10^{-5}$ can fit the derived SFR with good accuracy. Combining these two factors, we find that the conversion efficiency from massive stars to GRBs is enhanced by a factor of 10, which may be able to explain the excess of the high-redshift GRB rate. We also investigate the cosmic reionization history using the derived SFR. The GRB-inferred SFR would be sufficient to maintain cosmic reionization over $6<z<10$ and reproduce the observed optical depth of Thomson scattering to the cosmic microwave background.

7 pages, 6 figures, A&A published

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