{
  "id": "astro-ph/0108096",
  "version": "v1",
  "published": "2001-08-06T18:00:36.000Z",
  "updated": "2001-08-06T18:00:36.000Z",
  "title": "A 12-day ASCA Observation of the Narrow-Line Seyfert 1 Galaxy Ton S180: Time-Selected Spectroscopy",
  "authors": [
    "P. Romano",
    "T. J. Turner",
    "S. Mathur",
    "I. M. George"
  ],
  "comment": "11 pages, 9 figures; accepted for publication in The Astrophysical Journal, LaTeX emulateapj.sty",
  "journal": "Astrophys.J.564:162-175,2002",
  "doi": "10.1086/324201",
  "categories": [
    "astro-ph"
  ],
  "abstract": "We present an analysis of the X-ray variability properties of the NLS1 galaxy Ton S180, based upon a 12-day continuous ASCA observation. We observe flux variations of a factor of 3.5 in the 0.7-1.3 keV band and 3.9 in the 2-10 keV band.Time-resolved spectroscopy (~1d sampling) reveals that the broad `soft hump' component at energies <2 keV shows flux variations on timescales down to 1 day that are well correlated with the photon index and the 2-10 keV band flux. A broad Fe K$\\alpha$ emission is detected. There is a evidence for a narrow Fe K$\\alpha$ line at ~6.8 keV, indicating an origin in ionized material. We do not detect significant variations of the line flux or EW on ~1 day-1 week timescales. The softness ratio reveals spectral variability on timescales down to ~1000 s, indicating that the power-law continuum and soft hump fluxes are not well correlated on this timescale. It also shows a slow decline across the observation, due to a combination of the different time-variability of the power-law continuum and soft hump flux on timescales of ~1 week. The X-ray emission originates within 12 Schwarzschild radii, and the amplitudes and timescales of the rapid variations we observed are consistent with those expected within disk-corona models. The soft hump variability timescale rules out an origin in large scale components (circumnuclear starburst). The $\\Gamma$-soft hump correlation is consistent with the soft hump being produced by up-scattering of the accretion disk radiation within a flaring disk corona.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2001-08-06T18:00:36.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "asca observation",
      "narrow-line seyfert",
      "time-selected spectroscopy",
      "kev band",
      "soft hump variability timescale rules"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "LaTeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 575621
    }
  }
}