The H2O Southern Galactic Plane Survey: NH3 (1,1) and (2,2) catalogues

Article


Purcell, C.R., Longmore, S.N., Walsh, A.J., Whiting, M.T., Breen, S.L., Britton, T., Brooks, K.J., Burton, M.G., Cunningham, M.R., Green, J.A., Harvey-Smith, L., Hindson, L., Hoare, M.G., Indermuehle, B., Jones, P.A., Lo, N., Lowe, V., Phillips, C.J., Thompson, M.A., ..., White G. L.. 2012. "The H2O Southern Galactic Plane Survey: NH3 (1,1) and (2,2) catalogues ." Monthly Notices of the Royal Astronomical Society. 426 (3), pp. 1972-1991. https://doi.org/10.1111/j.1365-2966.2012.21800.x
Article Title

The H2O Southern Galactic Plane Survey: NH3 (1,1) and (2,2) catalogues

ERA Journal ID1074
Article CategoryArticle
AuthorsPurcell, C.R., Longmore, S.N., Walsh, A.J., Whiting, M.T., Breen, S.L., Britton, T., Brooks, K.J., Burton, M.G., Cunningham, M.R., Green, J.A., Harvey-Smith, L., Hindson, L., Hoare, M.G., Indermuehle, B., Jones, P.A., Lo, N., Lowe, V., Phillips, C.J., Thompson, M.A., Urquhart, J.S., Voronkov, M.A. and White G. L.
Journal TitleMonthly Notices of the Royal Astronomical Society
Journal Citation426 (3), pp. 1972-1991
Number of Pages20
Year2012
PublisherOxford University Press
Place of PublicationUnited Kingdom
ISSN0035-8711
1365-2966
Digital Object Identifier (DOI)https://doi.org/10.1111/j.1365-2966.2012.21800.x
Web Address (URL)https://academic.oup.com/mnras/article/426/3/1972/988583
Abstract

The H2O Southern Galactic Plane Survey (HOPS) has mapped a 100° strip of the Galactic plane (-70° > l > 30°, |b| < 0.°5) using the 22 m Mopra antenna at 12 mm wavelengths. Observations were conducted in on-the-fly mode using the Mopra spectrometer (MOPS), targeting water masers, thermal molecular emission and radio-recombination lines. Foremost among the thermal lines are the 23 GHz transitions of NH3 J, K = (1,1) and (2,2), which trace the densest parts of molecular clouds (n > 104 cm-3). In this paper, we present the NH3 (1,1) and (2,2) data, which have a resolution of 2 arcmin and cover a velocity range of ±200 km s-1. The median sensitivity of the NH3 data cubes is σTmb = 0.20 ± 0.06 K. For the (1,1) transition, this sensitivity equates to a 3.2 kpc distance limit for detecting a 20 K, 400M⊙ cloud at the 5σ level. Similar clouds of mass 5000M⊙ would be detected as far as the Galactic Centre, while 30 000M⊙ clouds would be seen across the Galaxy. We have developed an automatic emission finding procedure based on the Australian Telescope National Facility (ATNF) DUCHAMP software and have used it to create a new catalogue of 669 dense molecular clouds. The catalogue is 100 per cent complete at the 5σ detection limit (Tmb = 1.0K). A preliminary analysis of the ensemble cloud properties suggests that the near-kinematic distances are favoured. The cloud positions are consistent with current models of the Galaxy containing a long bar. Combined with other Galactic plane surveys this new molecular-line data set constitutes a key tool for examining Galactic structure and evolution. Data cubes, spectra and catalogues are available to the community via the HOPS website.

KeywordsGalaxy:structure; ISM:evolution; Radio lines:ISM; Stars:early-type; Stars:formation; Surveys
Public Notes

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2012 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

FunderScience and Technology Facilities Council
Byline AffiliationsUniversity of Sydney
University of Leeds, United Kingdom
University of Manchester, United Kingdom
European Southern Observatory, Germany
Center for Astrophysics Harvard and Smithsonian, United States
James Cook University
Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia
Macquarie University
University of New South Wales
University of Hertfordshire, United Kingdom
University of Chile, Chile
Paris Diderot University, France
Max Planck Society, Germany
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