{
  "id": "0912.5140",
  "version": "v2",
  "published": "2009-12-28T08:10:36.000Z",
  "updated": "2010-01-05T02:19:04.000Z",
  "title": "High-redshift star formation rate up to z~8.3 derived from gamma-ray bursts and influence of background cosmology",
  "authors": [
    "F. Y. Wang",
    "Z. G. Dai"
  ],
  "comment": "5 pages, 5 figures, 2 tables, two references added",
  "journal": "MNRAS, 2009, 400, L10",
  "doi": "10.1111/j.1745-3933.2009.00751.x",
  "categories": [
    "astro-ph.CO",
    "astro-ph.HE"
  ],
  "abstract": "The high-redshift star formation rate (SFR) is difficult to measure directly even by modern approaches. Long-duration gamma-ray bursts (GRBs) can be detected to the edge of the visible universe because of their high luminorsities. The collapsar model of long gamma-ray bursts indicates that they may trace the star formation history. So long gamma-ray bursts may be a useful tool of measuring the high-redshift SFR. Observations show that long gamma-ray bursts prefer to form in a low-metallicity environment. We study the high-redshift SFR up to z~8.3 considering the Swift GRBs tracing the star formation history and the cosmic metallicity evolution in different background cosmological models including $\\Lambda$CDM, quintessence, quintessence with a time-varying equation of state, and brane-world model. We use latest Swift GRBs including two highest-$z$ GRBs, GRB 080913 at $z=6.7$ and GRB 090423 at $z=8.3$. We find that the SFR at $z>4$ shows a steep decay with a slope of $\\sim -5.0$ in $\\Lambda$CDM. In the other three models, the high-redshift SFR is slightly different from $\\Lambda$CDM model, and also shows a steep decay.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2010-01-05T02:19:04.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "high-redshift star formation rate",
      "background cosmology",
      "star formation history",
      "high-redshift sfr",
      "long gamma-ray bursts prefer"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "Wiley-Blackwell",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2009,
      "month": "Nov",
      "volume": 400,
      "number": 1
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 841305,
      "adsabs": "2009MNRAS.400L..10W"
    }
  }
}