{
  "id": "1105.5885",
  "version": "v2",
  "published": "2011-05-30T07:22:35.000Z",
  "updated": "2018-02-13T14:19:38.000Z",
  "title": "Connecting Synchrotron, Cosmic Rays, and Magnetic Fields in the Plane of the Galaxy",
  "authors": [
    "T. R. Jaffe",
    "A. J. Banday",
    "J. P. Leahy",
    "S. Leach",
    "A. W. Strong"
  ],
  "comment": "12 pages, 10 figures. Accepted for publication in MNRAS. This research was supported by the Agence Nationale de la Recherche (ANR-08-CEXC-0002-01)",
  "doi": "10.1111/j.1365-2966.2011.19114.x",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We extend previous work modeling the Galactic magnetic field in the plane using synchrotron emission in total and polarised intensity. In this work, we include a more realistic treatment of the cosmic-ray electrons using the GALPROP propagation code optimized to match the existing high-energy data. This addition reduces the degeneracies in our previous analysis and when combined with an additional observed synchrotron frequency allows us to study the low-energy end of the cosmic-ray electron spectrum in a way that has not previously been done. For a pure diffusion propagation, we find a low-energy injection spectrum slightly harder than generally assumed; for J(E) \\propto E^{\\alpha}, we find {\\alpha} = -1.34 \\pm 0.12, implying a very sharp break with the spectrum above a few GeV. This then predicts a synchrotron brightness temperature spectral index, {\\beta}, on the Galactic plane that is -2.8 < {\\beta} < -2.74 below a few GHz and -2.98 < {\\beta} < -2.91 up to 23 GHz. We find that models including cosmic-ray re-acceleration processes appear to be incompatible with the synchrotron data.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-05-30T07:22:35.000Z",
      "comment": "12 pages, 10 figures. Accepted for publication in MNRAS",
      "journal": null,
      "doi": null
    },
    {
      "version": "v2",
      "updated": "2018-02-13T14:19:38.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "magnetic field",
      "cosmic rays",
      "connecting synchrotron",
      "synchrotron brightness temperature spectral index",
      "cosmic-ray re-acceleration processes appear"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1111/j.1365-2966.2011.19114.x",
      "journal": "J. Finance",
      "year": 2011,
      "month": "Sep",
      "volume": 416,
      "number": 2,
      "pages": 1152,
      "publisher": "Wiley-Blackwell"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 901980,
      "adsabs": "2011MNRAS.416.1152J"
    }
  }
}