{
  "id": "2210.01352",
  "version": "v1",
  "published": "2022-10-04T03:42:00.000Z",
  "updated": "2022-10-04T03:42:00.000Z",
  "title": "Diffuse $γ$-ray emission around the massive star forming region of Carina Nebula Complex",
  "authors": [
    "Ting-Ting Ge",
    "Xiao-Na Sun",
    "Rui-Zhi Yang",
    "Yun-Feng Liang",
    "En-Wei Liang"
  ],
  "comment": "8 pages, 7 figures. Accepted for publication in MNRAS",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We report the Fermi Large Area Telescope (Fermi-LAT) detection of the $\\gamma$-ray emission toward the massive star forming region of Carina Nebula Complex (CNC). Using the latest source catalog and diffuse background models, we found that the GeV $\\gamma$-ray emission in this region can be resolved into three different components. The GeV $\\gamma$-ray emission from the central point source is considered to originate from the Eta Carina ($\\eta$ Car). We further found the diffuse GeV $\\gamma$-ray emission around the CNC which can be modelled by two Gaussian disks with radii of 0.4\\deg (region A) and 0.75\\deg (region B), respectively. The GeV $\\gamma$-ray emission from both the regions A and B have good spatial consistency with the derived molecular gas in projection on the sky. The GeV $\\gamma$-ray emission of region A reveals a characteristic spectral shape of the pion-decay process, which indicates that the $\\gamma$-rays are produced by the interactions of hadronic cosmic rays with ambient gas. The $\\gamma$-rays spectrum of region B has a hard photon index of 2.12 $\\pm$ 0.02, which is similar to other young massive star clusters. We argue that the diffuse GeV $\\gamma$-ray emission in region A and region B likely originate from the interaction of accelerated protons in clusters with the ambient gas.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-10-04T03:42:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ray emission",
      "massive star forming region",
      "carina nebula complex",
      "fermi large area telescope",
      "diffuse gev"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}