{
  "id": "1803.00566",
  "version": "v1",
  "published": "2018-03-01T16:40:08.000Z",
  "updated": "2018-03-01T16:40:08.000Z",
  "title": "The Inception of Star Cluster Formation Revealed by [CII] Emission Around an Infrared Dark Cloud",
  "authors": [
    "Thomas G. Bisbas",
    "Jonathan C. Tan",
    "Timea Csengeri",
    "Benjamin Wu",
    "Wanggi Lim",
    "Paola Caselli",
    "Rolf Guesten",
    "Oliver Ricken",
    "Denise Riquelme"
  ],
  "comment": "5 pages, 4 figures, submitted to MNRAS Letters",
  "categories": [
    "astro-ph.GA",
    "astro-ph.SR"
  ],
  "abstract": "We present SOFIA-upGREAT observations of [CII] emission of Infrared Dark Cloud (IRDC) G035.39-00.33, designed to trace its atomic gas envelope and thus test models of the origins of such clouds. Several velocity components of [CII] emission are detected, tracing structures that are at a wide range of distances in the Galactic plane. We find a main component that is likely associated with the IRDC and its immediate surroundings. This strongest emission component has a velocity similar to that of the $^{13}$CO(2-1) emission of the IRDC, but offset by $\\sim3\\:{\\rm km\\:s}^{-1}$ and with a larger velocity width of $\\sim9\\:{\\rm km\\:s}^{-1}$. The spatial distribution of the [CII] emission of this component is also offset predominantly to one side of the dense filamentary structure of the IRDC. The CII column density is estimated to be $N_{\\rm CII}\\sim 2.1\\times10^{17}\\,{\\rm cm}^{-2}$. We compare these results to the [CII] emission from numerical simulations of magnetized, dense gas filaments formed from giant molecular cloud (GMC) collisions, finding similar spatial and kinematic offsets. These observations and modeling of [CII] add further to the evidence that IRDC G035.39-00.33 has been formed by a process of GMC-GMC collision, which may thus be an important mechanism for initiating star cluster formation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-03-01T16:40:08.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "infrared dark cloud",
      "cii column density",
      "initiating star cluster formation",
      "dense filamentary structure",
      "larger velocity width"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}