{
  "id": "1409.2242",
  "version": "v1",
  "published": "2014-09-08T08:42:54.000Z",
  "updated": "2014-09-08T08:42:54.000Z",
  "title": "Model of the expansion of H II region RCW 82",
  "authors": [
    "K. V. Krasnobaev",
    "R. R. Tagirova",
    "G. Yu. Kotova"
  ],
  "comment": "14 pages, 3 figures",
  "journal": "The Astrophysical Journal, 786:90 (6pp), 2014",
  "doi": "10.1088/0004-637X/786/2/90",
  "categories": [
    "astro-ph.GA",
    "astro-ph.SR"
  ],
  "abstract": "This paper aims to resolve the problem of formation of young objects observed in the RCW 82 H {\\small II} region. In the framework of a classical trigger model the estimated time of fragmentation is larger than the estimated age of the H {\\small II} region. Thus the young objects could not have formed during the dynamical evolution of the H {\\small II} region. We propose a new model that helps resolve this problem. This model suggests that the H {\\small II} region RCW 82 is embedded in a cloud of limited size that is denser than the surrounding interstellar medium. According to this model, when the ionization--shock front leaves the cloud it causes the formation of an accelerating dense gas shell. In the accelerated shell, the effects of the Rayleigh--Taylor (R-T) instability dominate and the characteristic time of the growth of perturbations with the observed magnitude of about 3 pc is 0.14 Myr, which is less than the estimated age of the H {\\small II} region. The total time $t_{\\sum}$, which is the sum of the expansion time of the H {\\small II} region to the edge of the cloud, the time of the R-T instability growth, and the free fall time, is estimated as $0.44<t_{\\sum} < 0.78$ Myr. We conclude that the young objects in the H {\\small II} region RCW 82 could be formed as a result of the R-T instability with subsequent fragmentation into large-scale condensations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-09-08T08:42:54.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "85A30"
    ],
    "keywords": [
      "region rcw",
      "young objects",
      "free fall time",
      "accelerating dense gas shell",
      "estimated age"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "The Astrophysical Journal",
      "year": 2014,
      "month": "May",
      "volume": 786,
      "number": 2,
      "pages": 90
    },
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014ApJ...786...90K"
    }
  }
}