{
  "id": "1306.2393",
  "version": "v1",
  "published": "2013-06-11T00:57:11.000Z",
  "updated": "2013-06-11T00:57:11.000Z",
  "title": "The first high-resolution observations of 19.9-GHz methanol masers",
  "authors": [
    "Vasaant Krishnan",
    "Simon Ellingsen",
    "Maxim Voronkov",
    "Shari Breen"
  ],
  "comment": "19 pages, 16 figures, 6 tables",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We have used the Australia Telescope Compact Array to undertake the first high-resolution observations of the 19.9-GHz methanol maser transition. The emission is coincident with the location of the targeted 6.7-GHz methanol masers to within 0.2 arcseconds in absolute position. We find that the relative distribution of the 19.9-GHz maser emission in our sample differs from that observed in the 6.7-GHz transition, in contrast to the similar distribution often seen in the 6.7- and 12.2-GHz methanol masers in many sources. We also find that the peak velocity for the 19.9-GHz methanol masers is frequently different from that observed in other class II transitions in the same regions. These two results suggest that while 19.9-GHz methanol masers arise from the same general location as other class II transitions, they are likely not coincident on milliarcsecond scales; which has implications for multi-transitional modelling of class II methanol maser sources. We have investigated the properties of the OH and other classII methanol transitions for those 107-GHz methanol masers with and without an associated 19.9-GHz methanol maser. On the basis of these comparisons we suggest that the 19.9-GHz transition traces an evolutionary phase around the peak of the class II maser luminosity into its decline.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-06-11T00:57:11.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "first high-resolution observations",
      "australia telescope compact array",
      "classii methanol transitions",
      "methanol masers arise",
      "methanol maser sources"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnras/stt1017",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2013,
      "month": "Aug",
      "volume": 433,
      "number": 4,
      "pages": 3346
    },
    "note": {
      "typesetting": "TeX",
      "pages": 19,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1238061,
      "adsabs": "2013MNRAS.433.3346K"
    }
  }
}