{
  "id": "1205.4078",
  "version": "v1",
  "published": "2012-05-18T04:59:55.000Z",
  "updated": "2012-05-18T04:59:55.000Z",
  "title": "Properties of dust in the Galactic center region probed by AKARI far-infrared spectral mapping - detection of a dust feature",
  "authors": [
    "H. Kaneda",
    "A. Yasuda",
    "T. Onaka",
    "M. Kawada",
    "N. Murakami",
    "T. Nakagawa",
    "Y. Okada",
    "H. Takahashi"
  ],
  "comment": "10 pages, 8 figures, accepted for publication in A&A",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We investigate the properties of interstellar dust in the Galactic center region toward the Arches and Quintuplet clusters. With the Fourier Transform Spectrometer of the AKARI/Far-Infrared Surveyor, we performed the far-infrared (60 - 140 cm^-1) spectral mapping of an area of about 10' x 10' which includes the two clusters to obtain a low-resolution (R = 1.2 cm^-1) spectrum at every spatial bin of 30\" x 30\". We derive the spatial variations of dust continuum emission at different wavenumbers, which are compared with those of the [O III] 88 micron (113 cm^-1) emission and the OH 119 micron (84 cm^-1) absorption. The spectral fitting shows that two dust modified blackbody components with temperatures of ~20 K and ~50 K can reproduce most of the continuum spectra. For some spectra, however, we find that there exists a significant excess on top of a modified blackbody continuum around 80 - 90 cm^-1 (110 - 130 microns). The warmer dust component is spatially correlated well with the [O III] emission and hence likely to be associated with the highly-ionized gas locally heated by intense radiation from the two clusters. The excess emission probably represents a dust feature, which is found to be spatially correlated with the OH absorption and a CO cloud. We find that a dust model including micron-sized graphite grains can reproduce the observed spectrum with the dust feature fairly well.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2012-05-18T04:59:55.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "galactic center region",
      "akari far-infrared spectral mapping",
      "dust feature",
      "properties",
      "dust continuum emission"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1051/0004-6361/201219238",
      "journal": "Astronomy and Astrophysics",
      "year": 2012,
      "month": "Jul",
      "volume": 543
    },
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1115274,
      "adsabs": "2012A&A...543A..79K"
    }
  }
}