The 6-GHz methanol multibeam maser catalogue – I. Galactic Centre region, longitudes 345° to 6°
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...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
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Oxford University Press
2010
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/18746 |
| _version_ | 1848749833034137600 |
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| author | Caswell, J. Fuller, G. Green, A. Avison, A. Breen, S. Brooks, K. Burton, M. Chrysostomou, A. Cox, J. Diamond, P. Ellingsen, S. Gray, M. Hoare, M. Masheder, M. McClure-Griffiths, N. Pestalozzi, M. Phillips, C. Quinn, L. Thompson, M. Voronkov, M. Walsh, Andrew Ward-Thompson, D. Wong-McSweeney, D. Yates, J. Cohen, R. |
| author_facet | Caswell, J. Fuller, G. Green, A. Avison, A. Breen, S. Brooks, K. Burton, M. Chrysostomou, A. Cox, J. Diamond, P. Ellingsen, S. Gray, M. Hoare, M. Masheder, M. McClure-Griffiths, N. Pestalozzi, M. Phillips, C. Quinn, L. Thompson, M. Voronkov, M. Walsh, Andrew Ward-Thompson, D. Wong-McSweeney, D. Yates, J. Cohen, R. |
| author_sort | Caswell, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T07:27:13Z |
| format | Journal Article |
| id | curtin-20.500.11937-18746 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:27:13Z |
| publishDate | 2010 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-187462017-09-13T13:43:52Z The 6-GHz methanol multibeam maser catalogue – I. Galactic Centre region, longitudes 345° to 6° Caswell, J. Fuller, G. Green, A. Avison, A. Breen, S. Brooks, K. Burton, M. Chrysostomou, A. Cox, J. Diamond, P. Ellingsen, S. Gray, M. Hoare, M. Masheder, M. McClure-Griffiths, N. Pestalozzi, M. Phillips, C. Quinn, L. Thompson, M. Voronkov, M. Walsh, Andrew Ward-Thompson, D. Wong-McSweeney, D. Yates, J. Cohen, R. ISM: molecules masers surveys stars: formation 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. 2010 Journal Article http://hdl.handle.net/20.500.11937/18746 10.1111/j.1365-2966.2010.16339.x Oxford University Press unknown |
| spellingShingle | ISM: molecules masers surveys stars: formation Caswell, J. Fuller, G. Green, A. Avison, A. Breen, S. Brooks, K. Burton, M. Chrysostomou, A. Cox, J. Diamond, P. Ellingsen, S. Gray, M. Hoare, M. Masheder, M. McClure-Griffiths, N. Pestalozzi, M. Phillips, C. Quinn, L. Thompson, M. Voronkov, M. Walsh, Andrew Ward-Thompson, D. Wong-McSweeney, D. Yates, J. Cohen, R. The 6-GHz methanol multibeam maser catalogue – I. Galactic Centre region, longitudes 345° to 6° |
| title | The 6-GHz methanol multibeam maser catalogue – I. Galactic Centre region, longitudes 345° to 6° |
| title_full | The 6-GHz methanol multibeam maser catalogue – I. Galactic Centre region, longitudes 345° to 6° |
| title_fullStr | The 6-GHz methanol multibeam maser catalogue – I. Galactic Centre region, longitudes 345° to 6° |
| title_full_unstemmed | The 6-GHz methanol multibeam maser catalogue – I. Galactic Centre region, longitudes 345° to 6° |
| title_short | The 6-GHz methanol multibeam maser catalogue – I. Galactic Centre region, longitudes 345° to 6° |
| title_sort | 6-ghz methanol multibeam maser catalogue – i. galactic centre region, longitudes 345° to 6° |
| topic | ISM: molecules masers surveys stars: formation |
| url | http://hdl.handle.net/20.500.11937/18746 |