{
  "id": "1011.4176",
  "version": "v2",
  "published": "2010-11-18T12:08:50.000Z",
  "updated": "2011-02-15T10:34:20.000Z",
  "title": "On the variability of the GeV and multi-TeV gamma-ray emission from the Crab Nebula",
  "authors": [
    "W. Bednarek",
    "W. Idec"
  ],
  "comment": "14 pages, 2 figures, accepted to MNRAS Main Journal (expended version)",
  "journal": "2011 MNRAS.414.2229B",
  "categories": [
    "astro-ph.HE",
    "astro-ph.GA"
  ],
  "abstract": "Recently the AGILE $\\gamma$-ray telescope has reported the enhanced $\\gamma$-ray emission above 100 MeV from the direction of the Crab Nebula during a period of a few days. This intriguing observation has been confirmed by the Fermi-LAT telescope. This emission does not show evidences of pulsations with the Crab pulsar. It seems that it originates at the shock region created as a result of the interaction of the pulsar wind with the nebula. We propose that such variable $\\gamma$-ray emission originate in the region behind the shock when the electrons can be accelerated as a result of the reconnection of the magnetic field compressed by the decelerating pulsar wind. The natural consequence of such interpretation is the prediction that the Crab Nebula $\\gamma$-ray spectrum produced by electrons as a result of the inverse Compton scattering of soft radiation to multi-TeV energies should also show synchronous variability on the time scales as observed at GeV energies by the AGILE and Fermi-LAT telescopes. We calculate how the end of the IC component of the Crab Nebula $\\gamma$-ray spectrum should look like during the quiescent and the flare GeV $\\gamma$-ray emission. We conclude that the variability of the multi-TeV $\\gamma$-ray spectrum from the Crab Nebula might in principle be responsible for the differences between the spectral features reported by the HEGRA and HESS Collaborations at the multi-TeV energies.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2011-02-15T10:34:20.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "crab nebula",
      "multi-tev gamma-ray emission",
      "ray spectrum",
      "variability",
      "multi-tev energies"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1111/j.1365-2966.2011.18539.x",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2011,
      "month": "Jul",
      "volume": 414,
      "number": 3,
      "pages": 2229
    },
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 878129,
      "adsabs": "2011MNRAS.414.2229B"
    }
  }
}