{
  "id": "1410.5897",
  "version": "v1",
  "published": "2014-10-22T02:06:10.000Z",
  "updated": "2014-10-22T02:06:10.000Z",
  "title": "The high-energy $γ$-ray emission of AP Librae",
  "authors": [
    "H. E. S. S. Collaboration",
    "Fermi-LAT collaborations"
  ],
  "comment": "15 pages, 6 figures",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "The $\\gamma$-ray spectrum of the low-frequency-peaked BL Lac (LBL) object AP Librae is studied, following the discovery of very-high-energy (VHE; $E>100\\,{\\rm GeV}$) $\\gamma$-ray emission up to the TeV range by the H.E.S.S. experiment. This makes AP Librae one of the few VHE emitters of the LBL type. The measured spectrum yields a flux of $(8.8 \\pm 1.5_{\\rm stat} \\pm 1.8_{\\rm sys}) \\times 10^{-12}\\ {\\rm cm}^{-2} {\\rm s}^{-1}$ above 130 GeV and a spectral index of $\\Gamma = 2.65\\pm0.19_{\\rm stat}\\pm0.20_{\\rm sys}$. This study also makes use of \\textit{Fermi}-LAT, observations in the high energy (HE, E$>$100 MeV) range, providing the longest continuous light curve (5 years) ever published on this source. The source underwent a flaring event between MJD 56306-56376 in the HE range, with a flux increase of a factor 3.5 in the 14-day bin light curve and no significant variation in spectral shape with respect to the low-flux state. While the H.E.S.S., and (low state) \\textit{Fermi}-LAT fluxes are in good agreement where they overlap, a spectral curvature between the steep VHE spectrum and the \\textit{Fermi}-LAT, spectrum is observed. The maximum of the $\\gamma$-ray emission in the spectral energy distribution is located below the GeV energy range.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-10-22T02:06:10.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ray emission",
      "high-energy",
      "bin light curve",
      "gev energy range",
      "longest continuous light curve"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1051/0004-6361/201321436",
      "journal": "Astronomy and Astrophysics",
      "year": 2015,
      "month": "Jan",
      "volume": 573
    },
    "note": {
      "typesetting": "TeX",
      "pages": 15,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1323256,
      "adsabs": "2015A&A...573A..31H"
    }
  }
}