{
  "id": "1401.5864",
  "version": "v1",
  "published": "2014-01-23T02:58:37.000Z",
  "updated": "2014-01-23T02:58:37.000Z",
  "title": "The high-redshift star formation rate derived from GRBs: possible origin and cosmic reionization",
  "authors": [
    "F. Y. Wang"
  ],
  "comment": "7 pages, 6 figures, A&A published",
  "journal": "A&A 556, A90 (2013)",
  "doi": "10.1051/0004-6361/201321623",
  "categories": [
    "astro-ph.HE",
    "astro-ph.CO"
  ],
  "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 $Z\\leq 0.004$ 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.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-01-23T02:58:37.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "high-redshift star formation rate",
      "cosmic reionization",
      "model explains grb formation",
      "high-redshift grb rate"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "Astronomy and Astrophysics",
      "year": 2013,
      "month": "Aug",
      "volume": 556
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1278552,
      "adsabs": "2013A&A...556A..90W"
    }
  }
}