{
  "id": "1006.5962",
  "version": "v2",
  "published": "2010-06-30T19:49:36.000Z",
  "updated": "2010-08-06T22:13:17.000Z",
  "title": "Evidence for Cosmic Ray Acceleration in Cassiopeia A",
  "authors": [
    "Miguel Araya",
    "Wei Cui"
  ],
  "comment": "16 pages, 4 figures",
  "journal": "Miguel Araya and Wei Cui 2010 ApJ 720 20",
  "doi": "10.1088/0004-637X/720/1/20",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "Combining archival data taken at radio and infrared wavelengths with state-of-the-art measurements at X-ray and gamma-ray energies, we assembled a broadband spectral energy distribution (SED) of Cas A, a young supernova remnant. Except for strong thermal emission at infrared and X-ray wavelengths, the SED is dominated by non-thermal radiation. We attempted to model the non-thermal SED with a two-zone leptonic model which assumes that the radio emission is produced by electrons that are uniformly distributed throughout the remnant while the non-thermal X-ray emission by electrons that are localized in regions near the forward shock. Synchrotron emission from the electrons can account for data from radio to X-ray wavelengths. Much of the GeV-TeV emission can also be explained by a combination of bremsstrahlung emission and inverse-Compton scattering (mainly of infrared thermal photons). However, the model cannot fit a distinct feature at GeV energies. This feature can be well accounted for by adding a pion-zero emission component to the model, providing evidence for cosmic ray production in Cas A. We discuss the implications of the results.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2010-08-06T22:13:17.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cosmic ray acceleration",
      "cassiopeia",
      "x-ray wavelengths",
      "broadband spectral energy distribution",
      "cosmic ray production"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "The Astrophysical Journal",
      "year": 2010,
      "month": "Sep",
      "volume": 720,
      "number": 1,
      "pages": 20
    },
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 859874,
      "adsabs": "2010ApJ...720...20A"
    }
  }
}