{
  "id": "1302.3464",
  "version": "v1",
  "published": "2013-02-14T16:48:39.000Z",
  "updated": "2013-02-14T16:48:39.000Z",
  "title": "Ionized Gas Kinematics at High Resolution. II: Discovery of a Double Infrared Cluster in II Zw 40",
  "authors": [
    "Sara Beck",
    "Jean Turner",
    "John Lacy",
    "Thomas Greathouse",
    "Ohr Lahad"
  ],
  "comment": "8 pages, 4 figures, Accepted to ApJ",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "The nearby dwarf galaxy II Zw 40 hosts an intense starburst. At the center of the starburst is a bright compact radio and infrared source, thought to be a giant dense HII region containing ~14,000 O stars. Radio continuum images suggest that the compact source is actually a collection of several smaller emission regions. We accordingly use the kinematics of the ionized gas to probe the structure of the radio-infrared emission region. With TEXES on the NASA-IRTF we measured the 10.5um [SIV] emission line with effective spectral resolutions, including thermal broadening, of ~25 and ~3 km/s and spatial resolution ~1\". The line profile shows two distinct, spatially coextensive, emission features. The stronger feature is at galactic velocity and has FWHM 47 km/s. The second feature is ~44km/s redward of the first and has FWHM 32 km/s. We argue that these are two giant embedded clusters, and estimate their masses to be ~3x10^5Mo and ~1.5x10^5 Mo. The velocity shift is unexpectedly large for such a small spatial offset. We suggest that it may arise in a previously undetected kinematic feature remaining from the violent merger that formed the galaxy.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-02-14T16:48:39.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ionized gas kinematics",
      "double infrared cluster",
      "high resolution",
      "dense hii region containing",
      "giant dense hii region"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/767/1/53",
      "journal": "The Astrophysical Journal",
      "year": 2013,
      "month": "Apr",
      "volume": 767,
      "number": 1,
      "pages": 53
    },
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1219297,
      "adsabs": "2013ApJ...767...53B"
    }
  }
}