{
  "id": "1703.02409",
  "version": "v1",
  "published": "2017-03-06T02:07:25.000Z",
  "updated": "2017-03-06T02:07:25.000Z",
  "title": "Evidence of a spectral break in the gamma-ray emission of the disk component of Large Magellanic Cloud: a hadronic origin?",
  "authors": [
    "Qing-Wen Tang",
    "Fang-Kun Peng",
    "Ruo-Yu Liu",
    "Pak-Hin Thomas Tam",
    "Xiang-Yu Wang"
  ],
  "comment": "7 pages, 4 figures",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "It has been suggested that high-energy gamma-ray emission ($>100{\\rm MeV}$) of nearby star-forming and starburst galaxies may be produced predominantly by cosmic rays colliding with the interstellar medium through neutral pion decay. Such pion-decay mechanism predicts a unique spectral signature in the gamma-ray spectrum, characterized by a fast rising spectrum (in $\\nu F_\\nu$ representation) and a spectral break below a few hundreds of MeV. We here report the evidence of a spectral break around 500~MeV in the disk emission of Large Magellanic Cloud, which is found in the analysis of the gamma-ray data extending down to 60 MeV observed by Fermi Large Area Telescope (LAT). The break is well consistent with the pion-decay model for the gamma-ray emission, although leptonic models, such as the electron bremsstrahlung emission, cannot be ruled out completely.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-03-06T02:07:25.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "large magellanic cloud",
      "spectral break",
      "disk component",
      "hadronic origin",
      "fermi large area telescope"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}