{
  "id": "1602.07805",
  "version": "v1",
  "published": "2016-02-25T05:41:44.000Z",
  "updated": "2016-02-25T05:41:44.000Z",
  "title": "X-ray Observations of Bow Shocks around Runaway O Stars. The case of $ζ$ Oph and BD+433654",
  "authors": [
    "J. A. Toalá",
    "L. M. Oskinova",
    "A. González-Gaán",
    "M. A. Guerrero",
    "R. Ignace",
    "M. Pohl"
  ],
  "comment": "10 pages, 6 figures, 1 table; to appear in ApJ",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "Non-thermal radiation has been predicted within bow shocks around runaway stars by recent theoretical works. We present X-ray observations towards the runaway stars $\\zeta$ Oph (Chandra and Suzaku) and BD+433654 (XMM-Newton) to search for the presence of non-thermal X-ray emission. We found no evidence of non-thermal emission spatially coincident with the bow shocks, nonetheless, diffuse emission is detected in the vicinity of $\\zeta$ Oph. After a careful analysis of its spectral characteristics we conclude that this emission has a thermal nature with a plasma temperature of $T \\approx 2 \\times10^{6}$ K. The cometary shape of this emission seems to be in line with recent predictions of radiation-hydrodynamic models of runaway stars. The case of BD+433654 is puzzling as non-thermal emission has been reported in a previous work for this source.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-02-25T05:41:44.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "bow shocks",
      "x-ray observations",
      "runaway stars",
      "non-thermal x-ray emission",
      "non-thermal emission spatially coincident"
    ],
    "publication": {
      "doi": "10.3847/0004-637X/821/2/79"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1424218
    }
  }
}