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A search for 22-GHz water masers within the giant molecular cloud associated with RCW 106


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Breen, SL and Wong, TL and Ellingsen, SP and Johnston-Hollitt, M and Wotherspoon, SJ and Bains, I and Burton, MG and Cunningham, M and Lo, N and Senkbeil, CE (2007) A search for 22-GHz water masers within the giant molecular cloud associated with RCW 106. Monthly Notices of the Royal Astronomical Society, 377 (2). pp. 491-506. ISSN 0035-8711

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We report the results of a blind search for 22-GHz water masers in two regions, covering
approximately half a square degree, within the giant molecular cloud associated with RCW
106. The complete search of the two regions was carried out with the 26-m Mount Pleasant
radio telescope and resulted in the detection of nine water masers, five of which are new
detections. Australia Telescope Compact Array (ATCA) observations of these detections have
allowed us to obtain positions with arcsecond accuracy, allowing meaningful comparison with
infrared and molecular data for the region.We find that for the regions surveyed there are more
water masers than either 6.7-GHz methanol, or main-line OH masers. The water masers are
concentrated towards the central axis of the star formation region, in contrast to the 6.7-GHz
methanol masers which tend to be located near the periphery. The colours of the GLIMPSE
point sources associated with thewater masers are similar to those of 6.7-GHz methanol masers,
but slightly less red.We have made a statistical investigation of the properties of the 13CO and
1.2-mm dust clumps with and without associated water masers.We find that the water masers
are associated with the more massive, denser and brighter 13CO and 1.2-mm dust clumps. We
present statistical models that are able to predict those 13CO and 1.2-mm dust clumps that are
likely to have associated water masers, with a low misclassification rate.

Item Type: Article
Keywords: masers – ISM: molecules – radio lines: general – stars: formation.
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Blackwell Publishing
Page Range: pp. 491-506
ISSN: 0035-8711
Identification Number - DOI: 10.1111/j.1365-2966.2007.11641.x
Additional Information:

The definitive version is available at

Date Deposited: 07 Apr 2008 14:43
Last Modified: 18 Nov 2014 03:36
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