{
  "id": "1701.02802",
  "version": "v1",
  "published": "2017-01-10T22:29:14.000Z",
  "updated": "2017-01-10T22:29:14.000Z",
  "title": "Simultaneous low- and high-mass star formation in a massive protocluster: ALMA observations of G11.92-0.61",
  "authors": [
    "C. J. Cyganowski",
    "C. L. Brogan",
    "T. R. Hunter",
    "R. Smith",
    "J. M. D. Kruijssen",
    "I. A. Bonnell",
    "Q. Zhang"
  ],
  "comment": "17 pages, 5 figures, 5 table, accepted for publication in MNRAS",
  "categories": [
    "astro-ph.GA",
    "astro-ph.SR"
  ],
  "abstract": "We present 1.05 mm ALMA observations of the deeply embedded high-mass protocluster G11.92-0.61, designed to search for low-mass cores within the accretion reservoir of the massive protostars. Our ALMA mosaic, which covers an extent of ~0.7 pc at sub-arcsecond (~1400 au) resolution, reveals a rich population of 16 new millimetre continuum sources surrounding the three previously-known millimetre cores. Most of the new sources are located in the outer reaches of the accretion reservoir: the median projected separation from the central, massive (proto)star MM1 is ~0.17 pc. The derived physical properties of the new millimetre continuum sources are consistent with those of low-mass prestellar and protostellar cores in nearby star-forming regions: the median mass, radius, and density of the new sources are 1.3 Msun, 1600 au, and n(H2)~10^7 cm^-3. At least three of the low-mass cores in G11.92-0.61 drive molecular outflows, traced by high-velocity 12CO(3-2) (observed with the SMA) and/or by H2CO and CH3OH emission (observed with ALMA). This finding, combined with the known outflow/accretion activity of MM1, indicates that high- and low-mass stars are forming (accreting) simultaneously within this protocluster. Our ALMA results are consistent with the predictions of competitive-accretion-type models in which high-mass stars form along with their surrounding clusters.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-01-10T22:29:14.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "high-mass star formation",
      "alma observations",
      "embedded high-mass protocluster g11",
      "massive protocluster",
      "millimetre continuum sources"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}