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dc.contributor.authorCaswell, J.
dc.contributor.authorFuller, G.
dc.contributor.authorGreen, A.
dc.contributor.authorAvison, A.
dc.contributor.authorBreen, S.
dc.contributor.authorBrooks, K.
dc.contributor.authorBurton, M.
dc.contributor.authorChrysostomou, A.
dc.contributor.authorCox, J.
dc.contributor.authorDiamond, P.
dc.contributor.authorEllingsen, S.
dc.contributor.authorGray, M.
dc.contributor.authorHoare, M.
dc.contributor.authorMasheder, M.
dc.contributor.authorMcClure-Griffiths, N.
dc.contributor.authorPestalozzi, M.
dc.contributor.authorPhillips, C.
dc.contributor.authorQuinn, L.
dc.contributor.authorThompson, M.
dc.contributor.authorVoronkov, M.
dc.contributor.authorWalsh, Andrew
dc.contributor.authorWard-Thompson, D.
dc.contributor.authorWong-McSweeney, D.
dc.contributor.authorYates, J.
dc.contributor.authorCohen, R.
dc.identifier.citationCaswell, J. and Fuller, G. and Green, A. and Avison, A. and Breen, S. and Brooks, K. and Burton, M. et al. 2010. The 6-GHz methanol multibeam maser catalogue – I. Galactic Centre region, longitudes 345° to 6°. Monthly Notices of the Royal Astronomical Society. 404: pp. 1029-1060.

We have conducted a Galactic plane survey of methanol masers at 6668 MHz using a seven-beam receiver on the Parkes telescope. Here we present results from the first part, which provides sensitive unbiased coverage of a large region around the Galactic Centre. Details are given for 183 methanol maser sites in the longitude range 345° through the Galactic Centre to 6°. Within 6° of the Galactic Centre, we found 88 maser sites, of which more than half (48) are new discoveries. The masers are confined to a narrow Galactic latitude range, indicative of many sources at the Galactic Centre distance and beyond, and confined to a thin disc population; there is no high-latitude population thatmight be ascribed to the Galactic bulge. Within 2° of the Galactic Centre the maser velocities all lie between -60 and +77kms-1, a range much smaller than the 540kms-1 range observed in CO.Elsewhere, the maser with highest positive velocity (+107kms-1) occurs, surprisingly, near longitude 355° and is probably attributable to the Galactic bar. The maser with the most negative velocity (-127kms-1) is near longitude 346°, within the longitude-velocity locus of the near side of the `3-kpc arm'. It has the most extreme velocity of a clear population of masers associated with the near and far sides of the 3-kpc arm. Closer to the Galactic Centre the maser space density is generally low, except within 0.25 kpc of the Galactic Centre itself, the `Galactic Centre zone', where it is 50 times higher, which is hinted at by the longitude distribution, and confirmed by the unusual velocities.

dc.publisherOxford University Press
dc.subjectISM: molecules
dc.subjectstars: formation
dc.titleThe 6-GHz methanol multibeam maser catalogue – I. Galactic Centre region, longitudes 345° to 6°
dc.typeJournal Article
dcterms.source.titleMonthly Notices of the Royal Astronomical Society
curtin.accessStatusOpen access via publisher

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