{
  "id": "1202.3125",
  "version": "v1",
  "published": "2012-02-14T20:00:10.000Z",
  "updated": "2012-02-14T20:00:10.000Z",
  "title": "X-Ray Observations of the Supernova Remnant W28 with Suzaku --- I. Spectral Study of the Recombining Plasma",
  "authors": [
    "Makoto Sawada",
    "Katsuji Koyama"
  ],
  "comment": "Accepted for publication in PASJ; Vol.64 No. 4 (8 pages, 5 figures)",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We present the Suzaku results of the mixed-morphology supernova remnant W28. The X-ray spectra of the central region of W28 exhibit many bright emission lines from highly ionized atoms. An optically thin thermal plasma in collisional ionization equilibrium, either of single-temperature or multi-temperature failed to reproduce the data with line-like and bump-like residuals at the Si Lyman$\\alpha$ energy and at 2.4--5.0 keV, respectively. The bumps probably correspond to radiative recombination continua from He-like Si and S. A simple recombining plasma model nicely fit the bump structures, but failed to fit low energy bands. The overall spectra can be fit with a multi-ionization temperature plasma with a common electron temperature. The multi-ionization temperatures are interpreted as elemental difference of ionization and recombination timescales. These results prefer the rarefaction scenario for the origin of the recombining plasma.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2012-02-14T20:00:10.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "spectral study",
      "x-ray observations",
      "plasma model nicely fit",
      "recombining plasma model",
      "mixed-morphology supernova remnant w28"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/pasj/64.4.81",
      "journal": "Publications of the Astronomical Society of Japan",
      "year": 2012,
      "month": "Aug",
      "volume": 64,
      "pages": 81
    },
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1089063,
      "adsabs": "2012PASJ...64...81S"
    }
  }
}