{
  "id": "1603.09475",
  "version": "v1",
  "published": "2016-03-31T07:42:18.000Z",
  "updated": "2016-03-31T07:42:18.000Z",
  "title": "Building up the Population III initial mass function from cosmological initial conditions",
  "authors": [
    "Athena Stacy",
    "Volker Bromm",
    "Aaron T. Lee"
  ],
  "comment": "23 pages, 14 figures, submitted to MNRAS",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We perform simulations of the growth of a Population III stellar system, starting from cosmological initial conditions at z=100. We self-consistently follow the formation of a minihalo and the subsequent collapse of its central gas to high densities, resolving scales as small as ~ 1 AU. Using sink particles to represent the growing protostars, we model the growth of the photodissociating and ionizing region around the first sink, continuing the simulation for ~ 5000 years after initial protostar formation. In addition to the first-forming sink, several tens of secondary sinks form before an ionization front develops around the most massive star. The resulting cluster has high rates of sink formation, ejections from the stellar disk, and sink mergers during the first ~ 2000 yr, before the onset of radiative feedback. By this time a warm ~ 5000 K phase of neutral gas has expanded to roughly the disk radius of 2000 AU, slowing mass flow onto the disk and sinks. By the end of the simulation, the most massive star grows to 20 M_Sun, while the total stellar mass approaches 75 M_Sun. Out of the ~ 40 sinks, approximately 30 are low-mass (M_*< 1 M_Sun). We therefore find that protostellar radiative feedback is insufficient to prevent rapid disk fragmentation and the formation of a high-member Pop III cluster before an ionization front emerges. Throughout the simulation, the majority of stellar mass is contained within the most massive stars, further implying that the Pop III initial mass function is top-heavy.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-03-31T07:42:18.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "initial mass function",
      "cosmological initial conditions",
      "population",
      "massive star",
      "prevent rapid disk fragmentation"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 23,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2016arXiv160309475S"
    }
  }
}