SIMBAD references

2010MNRAS.404.1029C - Mon. Not. R. Astron. Soc., 404, 1029-1060 (2010/May-2)

The 6-GHz methanol multibeam maser catalogue - I. Galactic centre region, longitudes 345° to 6°.

CASWELL J.L., FULLER G.A., GREEN J.A., AVISON A., BREEN S.L., BROOKS K.J., BURTON M.G., CHRYSOSTOMOU A., COX J., DIAMOND P.J., ELLINGSEN S.P., GRAY M.D., HOARE M.G., MASHEDER M.R.W., McCLURE-GRIFFITHS N.M., PESTALOZZI M.R., PHILLIPS C.J., QUINN L., THOMPSON M.A., VORONKOV M.A., WALSH A.J., WARD-THOMPSON D., WONG-McSWEENEY D., YATES J.A. and COHEN R.J.

Abstract (from CDS):

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 that might be ascribed to the Galactic bulge.

Within 2° of the Galactic Centre the maser velocities all lie between -60 and +77km/s, a range much smaller than the 540km/s range observed in CO. Elsewhere, the maser with highest positive velocity (+107km/s) occurs, surprisingly, near longitude 355° and is probably attributable to the Galactic bar. The maser with the most negative velocity (-127km/s) 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.

Journal keyword(s): masers - surveys - stars: formation - ISM: molecules

VizieR on-line data: <CDS Catalogue: VIII/96>

Nomenclature: Table 1: MMB GLLL.lll+BB.bbb N=183, MMB GLLL.lll+BB.bbbn (No. G348.550-00.979n).

Simbad objects: 190

Full paper

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