{
  "id": "1101.4404",
  "version": "v1",
  "published": "2011-01-23T20:38:42.000Z",
  "updated": "2011-01-23T20:38:42.000Z",
  "title": "High-energy emission from star-forming galaxies",
  "authors": [
    "Massimo Persic",
    "Yoel Rephaeli"
  ],
  "comment": "Invited talk at SciNeGHE2010 (8th Wotkshop on Science with the New Generation of High Energy Gamma-ray Experiments): Gamma-ray Astrophysics in the Multimessenger Context (Trieste, Sept.8-10, 2010)",
  "categories": [
    "astro-ph.HE",
    "astro-ph.CO"
  ],
  "abstract": "Adopting the convection-diffusion model for energetic electron and proton propagation, and accounting for all the relevant hadronic and leptonic processes, the steady-state energy distributions of these particles in the starburst galaxies M82 and NGC253 can be determined with a detailed numerical treatment. The electron distribution is directly normalized by the measured synchrotron radio emission from the central starburst region; a commonly expected theoretical relation is then used to normalize the proton spectrum in this region, and a radial profile is assumed for the magnetic field. The resulting radiative yields of electrons and protons are calculated: the predicted >100MeV and >100GeV fluxes are in agreement with the corresponding quantities measured with the orbiting Fermi telescope and the ground-based VERITAS and HESS Cherenkov telescopes. The cosmic-ray energy densities in central regions of starburst galaxies, as inferred from the radio and gamma-ray measurements of (respectively) non-thermal synchrotron and neutral-pion-decay emission, are U=O(100) eV/cm3, i.e. at least an order of magnitude larger than near the Galactic center and in other non-very-actively star-forming galaxies. These very different energy density levels reflect a similar disparity in the respective supernova rates in the two environments. A L(gamma) ~ SFR^(1.4) relationship is then predicted, in agreement with preliminary observational evidence.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-01-23T20:38:42.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "98.70.Sa",
      "98.56.Ne",
      "95.85.Pw",
      "98.56.Si",
      "98.54.Ep"
    ],
    "keywords": [
      "star-forming galaxies",
      "high-energy emission",
      "energy density levels reflect",
      "preliminary observational evidence",
      "starburst galaxies m82"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1393/ncc/i2011-10858-1"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 885225,
      "adsabs": "2011arXiv1101.4404P"
    }
  }
}