{
  "id": "1511.04483",
  "version": "v1",
  "published": "2015-11-14T00:14:28.000Z",
  "updated": "2015-11-14T00:14:28.000Z",
  "title": "Long GRBs as a Tool to Investigate Star Formation in Dark Matter Halos",
  "authors": [
    "Jun-Jie Wei",
    "Jing-Meng Hao",
    "Xue-Feng Wu",
    "Ye-Fei Yuan"
  ],
  "comment": "23 pages, 6 figures, 1 table, accepted by Journal of High Energy Astrophysics",
  "categories": [
    "astro-ph.HE",
    "astro-ph.GA"
  ],
  "abstract": "First stars can only form in structures that are suitably dense, which can be parametrized by the minimum dark matter halo mass $M_{\\rm min}$. $M_{\\rm min}$ must plays an important role in star formation. The connection of long gamma-ray bursts (LGRBs) with the collapse of massive stars has provided a good opportunity for probing star formation in dark matter halos. We place some constraints on $M_{\\rm min}$ using the latest $Swift$ LGRB data. We conservatively consider that LGRB rate is proportional to the cosmic star formation rate (CSFR) and an additional evolution parametrized as $(1+z)^{\\alpha}$, where the CSFR model as a function of $M_{\\rm min}$. Using the $\\chi^{2}$ statistic, the contour constraints on the $M_{\\rm min}$--$\\alpha$ plane show that at the $1\\sigma$ confidence level, we have $M_{\\rm min}<10^{10.5}$ $\\rm M_{\\odot}$ from 118 LGRBs with redshift $z<4$ and luminosity $L_{\\rm iso}>1.8\\times10^{51}$ erg $\\rm s^{-1}$. We also find that adding 12 high-\\emph{z} $(4<z<5)$ LGRBs (consisting of 104 LGRBs with $z<5$ and $L_{\\rm iso}>3.1\\times10^{51}$ erg $\\rm s^{-1}$) could result in much tighter constraints on $M_{\\rm min}$, for which, $10^{7.7}\\rm M_{\\odot}<M_{\\rm min}<10^{11.6}\\rm M_{\\odot}$ ($1\\sigma$). Through Monte Carlo simulations, we estimate that future five years of Sino-French spacebased multiband astronomical variable objects monitor (\\emph{SVOM}) observations would tighten these constraints to $10^{9.7}\\rm M_{\\odot}<M_{\\rm min}<10^{11.3}\\rm M_{\\odot}$. The strong constraints on $M_{\\rm min}$ indicate that LGRBs are a new promising tool for investigating star formation in dark matter halos.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-11-14T00:14:28.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "star formation",
      "long grbs",
      "multiband astronomical variable objects",
      "astronomical variable objects monitor",
      "constraints"
    ],
    "publication": {
      "doi": "10.1016/j.jheap.2015.11.001"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 23,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1404823
    }
  }
}