{
  "id": "1808.09981",
  "version": "v1",
  "published": "2018-08-29T18:00:42.000Z",
  "updated": "2018-08-29T18:00:42.000Z",
  "title": "Optimal neighbourhood to nurture giants: a fundamental link between star forming galaxies and direct collapse black holes",
  "authors": [
    "Bhaskar Agarwal Fergus Cullen",
    "Sadegh Khochfar",
    "Daniel Ceverino",
    "Ralf S. Klessen"
  ],
  "comment": "Submitted to MNRAS. Comments welcome",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "Massive $10^{4-5}\\rm\\ M_{\\odot}$ black hole seeds resulting from the \\textit{direct} collapse of pristine gas require a metal-free atomic cooling halo with extremely low H$_2$ fraction, allowing the gas to cool isothermally in the presence of atomic hydrogen. In order to achieve this chemo-thermodynamical state, the gas needs to be irradiated by both: Lyman-Werner (LW) photons in the energy range $11.2-13.6$ eV capable of photodissociating H$_2$, and $0.76$ eV photons capable of photodetaching H$^-$. Employing cosmological simulations capable of creating the first galaxies in high resolution, we explore if there exists a subset that favours DCBH formation in their vicinity. We find a fundamental relation between the maximum distance at which a galaxy can cause DCBH formation and its star formation rate (SFR), which automatically folds in the chemo-thermodynamical effects of both H$_2$ photo-dissociation and H$^-$ photo-detachment. This is in contrast to the scatter in the LW flux parameter seen at the maximum distance. It shows up to a 3 order of magnitude scatter, which can be interpreted as a scatter in `J$_{crit}$'. Thus, computing the rates and/or the LW flux from a galaxy is no longer necessary to identify neighbouring sites of DCBH formation, as our relation allows one to distinguish regions where DCBH formation could be triggered in the vicinity of a galaxy of a given SFR.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-08-29T18:00:42.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "direct collapse black holes",
      "star forming galaxies",
      "dcbh formation",
      "nurture giants",
      "optimal neighbourhood"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}