{
  "id": "0909.2632",
  "version": "v1",
  "published": "2009-09-14T19:47:24.000Z",
  "updated": "2009-09-14T19:47:24.000Z",
  "title": "Following the 2008 outburst decay of the black hole candidate H1743-322 in X-ray and radio",
  "authors": [
    "P. G. Jonker",
    "J. Miller-Jones",
    "J. Homan",
    "E. Gallo",
    "M. Rupen",
    "J. Tomsick",
    "R. P. Fender",
    "P. Kaaret",
    "D. T. H. Steeghs",
    "M. A. P. Torres",
    "R. Wijnands",
    "S. Markoff",
    "W. H. G. Lewin"
  ],
  "comment": "10 pages, 4 figures, accepted for publication by MNRAS",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "In this Paper we report on radio (VLA and ATCA) and X-ray (RXTE, Chandra and Swift) observations of the outburst decay of the transient black hole candidate H1743-322 in early 2008. We find that the X-ray light curve followed an exponential decay, leveling off towards its quiescent level. The exponential decay timescale is ~4 days and the quiescent flux corresponds to a luminosity of 3x10^32 (d/7.5 kpc)^2 erg/s. This together with the relation between quiescent X-ray luminosity and orbital period reported in the literature suggests that H1743-322 has an orbital period longer than ~10 hours. Both the radio and X-ray light curve show evidence for flares. The radio - X-ray correlation can be well described by a power-law with index ~0.18. This is much lower than the index of 0.6-0.7 found for the decay of several black hole transients before. The radio spectral index measured during one of the radio flares while the source is in the low-hard state, is -0.5+-0.15, which indicates that the radio emission is optically thin. This is unlike what has been found before in black hole sources in the low-hard state. We attribute the radio flares and the low index for the radio - X-ray correlation to the presence of shocks downstream the jet flow, triggered by ejection events earlier in the outburst. We find no evidence for a change in X-ray power law spectral index during the decay, although the relatively high extinction of N_H =2.3x10^22 cm^-2 limits the detected number of soft photons and thus the accuracy of the spectral fits.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-09-14T19:47:24.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "outburst decay",
      "x-ray light curve",
      "x-ray power law spectral index",
      "transient black hole candidate",
      "exponential decay"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1111/j.1365-2966.2009.15717.x",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2010,
      "month": "Jan",
      "volume": 401,
      "number": 2,
      "pages": 1255
    },
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 831168,
      "adsabs": "2010MNRAS.401.1255J"
    }
  }
}