{
  "id": "1911.08321",
  "version": "v1",
  "published": "2019-11-18T02:45:59.000Z",
  "updated": "2019-11-18T02:45:59.000Z",
  "title": "Evolution of High-energy Particle Distribution in Supernova Remnants",
  "authors": [
    "Houdun Zeng",
    "Yuliang Xin",
    "Qi Fu",
    "Siming Liu"
  ],
  "comment": "3 pages, 4 figures; contribution to the proceedings of \"Supernova Remnants II: An Odyssey in Space after Stellar death\", 3-8 June 2019, Chania, Grete, Greece",
  "categories": [
    "astro-ph.HE",
    "hep-ph"
  ],
  "abstract": "The spectra fits to a sample of 34 supernova remnants (Zeng et al., 2019) are updated. $\\gamma$-ray spectra of 20 supernova remnants (SNRs) with a soft TeV spectrum are further analyzed. We found that 17 of them can be fitted in the hadronic scenario with a single power-law ion distribution with an index of $\\sim$ 2.6, which is significantly softer than the ion distribution inferred from $\\gamma$-ray observations of star-burst galaxies. If Galactic cosmic rays are mostly produced by SNRs, this result suggests that SNRs in star-burst galaxies may never reach the phase with a soft $\\gamma$-ray spectra or escape of high-energy particles from SNRs before they reach this phase with a soft $\\gamma$-ray spectrum dominates the contribution of SNRs to Galactic cosmic rays.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-11-18T02:45:59.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "supernova remnants",
      "high-energy particle distribution",
      "galactic cosmic rays",
      "single power-law ion distribution",
      "star-burst galaxies"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 3,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}