{
  "id": "2003.13925",
  "version": "v1",
  "published": "2020-03-31T02:51:11.000Z",
  "updated": "2020-03-31T02:51:11.000Z",
  "title": "Massive star formation in the Carina nebula complex and Gum 31 -- I. The Carina nebula complex",
  "authors": [
    "Shinji Fujita",
    "Hidetoshi Sano",
    "Rei Enokiya",
    "Katsuhiro Hayashi",
    "Mikito Kohno",
    "Kisetsu Tsuge",
    "Kengo Tachihara",
    "Atsushi Nishimura",
    "Akio Ohama",
    "Yumiko Yamane",
    "Takahiro Ohno",
    "Rin Yamada",
    "Yasuo Fukui"
  ],
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Herein, we present results from observations of the 12CO (J=1-0), 13CO (J=1-0), and 12CO (J=2-1) emission lines toward the Carina nebula complex (CNC) obtained with the Mopra and NANTEN2 telescopes. We focused on massive-star-forming regions associated with the CNC including the three star clusters Tr14, Tr15, and Tr16, and the isolated WR-star HD92740. We found that the molecular clouds in the CNC are separated into mainly four clouds at velocities -27, -20, -14, and -8 km/s. Their masses are 0.7x10^4Msun, 5.0x10^4 Msun, 1.6x10^4 Msun, and 0.7x10^4 Msun, respectively. Most are likely associated with the star clusters, because of their high 12CO (J=2-1)/12CO (J=1-0) intensity ratios and their correspondence to the Spitzer 8 micron distributions. In addition, these clouds show the observational signatures of cloud--cloud collisions. In particular, there is a V-shaped structure in the position--velocity diagram and a complementary spatial distribution between the -20 km/s cloud and the -14 km/s cloud. Based on these observational signatures, we propose a scenario wherein the formation of massive stars in the clusters was triggered by a collision between the two clouds. By using the path length of the collision and the assumed velocity separation, we estimate the timescale of the collision to be ~1 Myr. This is comparable to the ages of the clusters estimated in previous studies.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-03-31T02:51:11.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "carina nebula complex",
      "massive star formation",
      "km/s cloud",
      "observational signatures",
      "complementary spatial distribution"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}