The H 2O southern galactic plane survey: NH 3 (1,1) and (2,2) catalogues

Purcell, C.R. and Longmore, S.N. and Walsh, A.J. and Whiting, M.T. and Breen, S.L. and Britton, T. and Brooks, K.J. and Burton, M.G. and Cunningham, M.R. and Green, J.A. and Harvey-Smith, L. and Hindson, L. and Hoare, M.G. and Indermuehle, B. and Jones, P.A. and Lo, N. and Lowe, V. and Phillips, C.J. and Thompson, M.A. and Urquhart, J.S. and Voronkov, M.A. and White, G.L. (2012) The H 2O southern galactic plane survey: NH 3 (1,1) and (2,2) catalogues. Monthly Notices of the Royal Astronomical Society, 426 (3). pp. 1972-1991. ISSN 0035-8711. (doi:https://doi.org/10.1111/j.1365-2966.2012.21800.x) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1111/j.1365-2966.2012.21800.x

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 NH 3 J, K = (1,1) and (2,2), which trace the densest parts of molecular clouds (n > 10 4 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 NH 3 data cubes is ?T mb = 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 5? 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 5? detection limit (T mb = 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. © 2012 The Authors Monthly Notices of the Royal Astronomical Society.

Item Type: Article
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Mon. Not. R. Astron. Soc. [Field not mapped to EPrints] AD - Sydney Institute for Astronomy (SiFA), School of Physics, The University of Sydney, Sydney, NSW 2006, Australia [Field not mapped to EPrints] AD - School of Physics and Astronomy, E.C. Stoner Building, University of Leeds, Leeds LS2 9JT, United Kingdom [Field not mapped to EPrints] AD - Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom [Field not mapped to EPrints] AD - European Southern Observatory, Karl Schwarzschildstrasse 2, Garching 85748, Germany [Field not mapped to EPrints] AD - Harvard-Smithsonian Centre for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States [Field not mapped to EPrints] AD - Centre for Astronomy, School of Engineering and Physical Sciences, James Cook University, Townsville, QLD 4811, Australia [Field not mapped to EPrints] AD - CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia [Field not mapped to EPrints] AD - Department of Physics and Astronomy, Macquarie University, Macquarie, NSW 2109, Australia [Field not mapped to EPrints] AD - School of Physics, University of New South Wales, Sydney, NSW 2052, Australia [Field not mapped to EPrints] AD - Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hertfordshire AL10 9AB, United Kingdom [Field not mapped to EPrints] AD - Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile [Field not mapped to EPrints] AD - Laboratoire AIM Paris-Saclay, CEA/Irfu - Uni. Paris Didérot - CNRS/INSU, 91191 Gif-sur-Yvette, France [Field not mapped to EPrints] AD - Max-Planck-Institut für Radioastronomie, Aug dem Hügel 69, 53121 Bonn, Germany [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Galaxy:structure, ISM:evolution, Radio lines:ISM, Stars:early-type, Stars:formation, Surveys
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: James Urquhart
Date Deposited: 30 Nov 2015 14:58 UTC
Last Modified: 30 May 2018 08:45 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/52206 (The current URI for this page, for reference purposes)
Urquhart, J.S.: https://orcid.org/0000-0002-1605-8050
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