The G305 star-forming complex: Wide-area molecular mapping of NH3 and H2O masers

Hindson, L. and Thompson, M.A. and Urquhart, J.S. and Clark, J.S. and Davies, Ben (2010) The G305 star-forming complex: Wide-area molecular mapping of NH3 and H2O masers. Monthly Notices of the Royal Astronomical Society, 408 (3). pp. 1438-1451. ISSN 0035-8711. (doi:https://doi.org/10.1111/j.1365-2966.2010.17154.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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http://www.dx.doi.org/10.1111/j.1365-2966.2010.171...

Abstract

We present wide-area radio (12 mm) Mopra telescope observations of the complex and rich massive star-forming region G305. Our goals are to determine the reservoir for star formation within G305 using NH3 to trace the dense molecular content, and thus the gas available to form stars; estimate physical parameters of detected NH3 clumps (temperature, column density, mass, etc.); locate current areas of active star formation via the presence of H2O and methanol masers and the distribution of young stellar objects (YSOs) and ultra-compact H ii regions associated with this region. This paper details the NH3 (J, K), (1,1), (2,2) and (3,3) inversion transition and 22 GHz H2O maser observations. We observed a ?Graphic region with ?2 arcmin angular resolution and a sensitivity of ?60 mK per 0.4 km s?1 channel. We identify 15 NH3 (1,1), 12 NH3 (2,2) and 6 NH3 (3,3) clumps surrounding the central H ii region. The sizes of the clumps vary between <2.6 and 10.1 pc; the average kinetic temperature of the gas is 25 K. We calculate clump masses of Graphic and find the total molecular mass of the complex to be Graphic. We note the positions of 56 star formation tracers, and discover a high degree of correlation with detected NH3 clumps. We have detected 16 H2O masers and find they correlate with the detected ammonia clumps. In general, they are found closer to the NH3 clump cores than star formation tracers of later evolutionary stages.

Item Type: Article
Uncontrolled keywords: ISM: clouds, ISM: molecules, Masers, Radio lines: ISM, Stars: formation
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 16:09 UTC
Last Modified: 30 May 2018 08:54 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/52230 (The current URI for this page, for reference purposes)
Urquhart, J.S.: https://orcid.org/0000-0002-1605-8050
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