{
  "id": "1312.3563",
  "version": "v1",
  "published": "2013-12-12T17:40:01.000Z",
  "updated": "2013-12-12T17:40:01.000Z",
  "title": "Measuring the Coronal Properties of IC4329A with NuSTAR",
  "authors": [
    "L. W. Brenneman",
    "G. Madejski",
    "F. Fuerst",
    "G. Matt",
    "M. Elvis",
    "F. A. Harrison",
    "D. R. Ballantyne",
    "S. E. Boggs",
    "F. E. Christensen",
    "W. W. Craig",
    "A. C. Fabian",
    "B. W. Grefenstette",
    "C. J. Hailey",
    "K. K. Madsen",
    "A. Marinucci",
    "E. Rivers",
    "D. Stern",
    "D. J. Walton",
    "W. W. Zhang"
  ],
  "comment": "17 pages in preprint format, 4 figures, 1 table. Accepted by ApJ",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We present an analysis of a ~160 ks NuSTAR observation of the nearby bright Seyfert galaxy IC4329A. The high-quality broadband spectrum enables us to separate the effects of distant reflection from the direct coronal continuum, and to therefore accurately measure the high-energy cutoff to be $E_{cut}=178^{+74}_{-40}$ keV. The coronal emission arises from accretion disk photons Compton up-scattered by a thermal plasma, with the spectral index and cutoff being due to a combination of the finite plasma temperature and optical depth. Applying standard Comptonization models, we measure both physical properties independently using the best signal-to-noise obtained to date in an AGN over the 3-79 keV band. We derive $kT_e=37^{+7}_{-6}$ keV with $\\tau=1.25^{+0.20}_{-0.10}$ assuming a slab geometry for the plasma, and $kT_e=33^{+6}_{-6}$ keV with $\\tau=3.41^{+0.58}_{-0.38}$ for a spherical geometry, with both having an equivalent goodness-of-fit.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-12-12T17:40:01.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "coronal properties",
      "nearby bright seyfert galaxy ic4329a",
      "high-quality broadband spectrum enables",
      "accretion disk photons compton",
      "standard comptonization models"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/781/2/83",
      "journal": "The Astrophysical Journal",
      "year": 2014,
      "month": "Feb",
      "volume": 781,
      "number": 2,
      "pages": 83
    },
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1268951,
      "adsabs": "2014ApJ...781...83B"
    }
  }
}