{
  "id": "1712.02804",
  "version": "v1",
  "published": "2017-12-07T19:00:12.000Z",
  "updated": "2017-12-07T19:00:12.000Z",
  "title": "NuSTAR and Swift observations of Swift J1357.2-0933 during an early phase of its 2017 outburst",
  "authors": [
    "H. Stiele",
    "A. K. H. Kong"
  ],
  "comment": "11 pages, 5 figures, accepted for publication in ApJ",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We present a detailed spectral analysis of Swift and NuSTAR observations of the very faint X-ray transient and black hole system Swift J1357.2-0933 during an early low hard state of its 2017 outburst. Swift J1357.2-0933 was observed at $\\sim$0.02% of the Eddington luminosity (for a distance of 2.3 kpc and a mass of 4 M$_{\\odot}$). Despite the low luminosity, the broadband X-ray spectrum between 0.3 and 78 keV requires the presence of a disk blackbody component with an inner disk temperature of T$_{\\mathrm{in}}$ $\\sim$ 0.06 keV in addition to a thermal Comptonization component with a photon index of {\\Gamma} $\\sim$ 1.70. Using a more physical model, which takes strong relativistic effects into account, and assuming a high inclination of 70$^\\circ$, which is motivated by the presence of dips in optical light curves, we find that the accretion disk is truncated within a few RISCO from the black hole, independent of the spin.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-12-07T19:00:12.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "swift observations",
      "early phase",
      "black hole system swift j1357",
      "early low hard state",
      "faint x-ray transient"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}