{
  "id": "1509.08941",
  "version": "v1",
  "published": "2015-09-29T20:18:51.000Z",
  "updated": "2015-09-29T20:18:51.000Z",
  "title": "X-ray Spectral Analysis of the Steady States of GRS 1915+105",
  "authors": [
    "Charith S. Peris",
    "Ronald A. Remillard",
    "James F. Steiner",
    "Saeqa D. Vrtilek",
    "Peggy Varniere",
    "Jerome Rodriguez",
    "Guy Pooley"
  ],
  "comment": "20 pages, 15 figures, 1 table. Submitted to ApJ",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We report on the X-ray spectral behavior within the steady states of GRS 1915+105. Our work is based on a vast data set obtained using the Proportional Counter Array on the Rossi X-ray Timing Explorer (RXTE/PCA) during the course of its entire mission (1996-2012). We also utilized 15 GHz radio data obtained using the Ryle Telescope from 1995 to 2006. The steady observations within the X-ray data set naturally separated into two regions in the color-color diagram and we refer to them as steady-soft and steady-hard. GRS 1915+105 displays significant curvature in the coronal component in both the soft and hard data within the RXTE/PCA bandpass. We fit both steady-soft and steady-hard observations with a model comprised of 'simplcut' in tandem with a multicolor disk model 'ezdiskbb' with the steady-soft observations requiring a slightly more complex overall model. A majority of the steady-soft observations displays a roughly constant inner disk radius, reminiscent of canonical soft state black hole binaries. On the other hand, the steady-hard observations display an evolving disk truncation, which is correlated to the mass accretion rate through the disk. The disk flux and coronal flux are strongly correlated in steady-hard observations and very weakly correlated in the steady-soft observations. Within the steady-hard observations we observe two particular circumstances when there are correlations between the coronal X-ray flux and the radio flux with log slopes \\eta=0.68+/-0.35 and \\eta=1.12+/-0.13. They are consistent with the upper and lower tracks of Gallo et al. (2012), respectively. A comparison of model parameters to the state definitions show that almost all steady-soft observations match the criteria of either thermal or steep power law state. A large portion (80 %) of the steady-hard observations matches the hard state criteria when the disk fraction constraint is neglected.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-09-29T20:18:51.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "x-ray spectral analysis",
      "steady states",
      "steady-hard observations",
      "state black hole binaries",
      "constant inner disk radius"
    ],
    "publication": {
      "doi": "10.3847/0004-637X/822/2/60"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 20,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1395421
    }
  }
}