{
  "id": "1808.00014",
  "version": "v1",
  "published": "2018-07-31T18:07:59.000Z",
  "updated": "2018-07-31T18:07:59.000Z",
  "title": "NuSTAR observations of Mrk 766: distinguishing reflection from absorption",
  "authors": [
    "D. J. K. Buisson",
    "M. L. Parker",
    "E. Kara",
    "R. V. Vasudevan",
    "A. M. Lohfink",
    "C. Pinto",
    "A. C. Fabian",
    "D. R. Ballantyne",
    "S. E. Boggs",
    "F. E. Christensen W. W. Craig",
    "D. Farrah",
    "C. J. Hailey",
    "F. A. Harrison",
    "C. Ricci",
    "D. Stern",
    "D. J. Walton",
    "W. W. Zhang"
  ],
  "comment": "14 pages, 10 figures, MNRAS accepted",
  "categories": [
    "astro-ph.HE",
    "astro-ph.GA"
  ],
  "abstract": "We present two new NuSTAR observations of the narrow line Seyfert 1 (NLS1) galaxy Mrk 766 and give constraints on the two scenarios previously proposed to explain its spectrum and that of other NLS1s: relativistic reflection and partial covering. The NuSTAR spectra show a strong hard (>15 keV) X-ray excess, while simultaneous soft X-ray coverage of one of the observations provided by XMM-Newton constrains the ionised absorption in the source. The pure reflection model requires a black hole of high spin ($a>0.92$) viewed at a moderate inclination ($i=46^{+1}_{-4}$ degrees). The pure partial covering model requires extreme parameters: the cut-off of the primary continuum is very low ($22^{+7}_{-5}$ keV) in one observation and the intrinsic X-ray emission must provide a large fraction (75%) of the bolometric luminosity. Allowing a hybrid model with both partial covering and reflection provides more reasonable absorption parameters and relaxes the constraints on reflection parameters. The fractional variability reduces around the iron K band and at high energies including the Compton hump, suggesting that the reflected emission is less variable than the continuum.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-07-31T18:07:59.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "nustar observations",
      "distinguishing reflection",
      "absorption",
      "simultaneous soft x-ray coverage",
      "narrow line seyfert"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}