University of Hertfordshire Research Archive

        JavaScript is disabled for your browser. Some features of this site may not work without it.

        Browse

        All of UHRABy Issue DateAuthorsTitlesThis CollectionBy Issue DateAuthorsTitles

        Arkivum Files

        My Downloads
        View Item 
        • UHRA Home
        • University of Hertfordshire
        • Research publications
        • View Item
        • UHRA Home
        • University of Hertfordshire
        • Research publications
        • View Item

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

        View/Open
        904347.pdf (PDF, 661Kb)
        Author
        Hindson, Luke
        Thompson, M.A.
        Urquhart, J.S.
        Clark, J.S.
        Davies, B.
        Attention
        2299/5758
        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 ~ 1.5 x 1 degreedegree region with ~2 ' 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 and find the total molecular mass of the complex to be . 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.
        Publication date
        2010
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1111/j.1365-2966.2010.17154.x
        Other links
        http://hdl.handle.net/2299/5758
        Metadata
        Show full item record
        Keep in touch

        © 2019 University of Hertfordshire

        I want to...

        • Apply for a course
        • Download a Prospectus
        • Find a job at the University
        • Make a complaint
        • Contact the Press Office

        Go to...

        • Accommodation booking
        • Your student record
        • Bayfordbury
        • KASPAR
        • UH Arts

        The small print

        • Terms of use
        • Privacy and cookies
        • Criminal Finances Act 2017
        • Modern Slavery Act 2015
        • Sitemap

        Find/Contact us

        • T: +44 (0)1707 284000
        • E: ask@herts.ac.uk
        • Where to find us
        • Parking
        • hr
        • qaa
        • stonewall
        • AMBA
        • ECU Race Charter
        • disability confident
        • AthenaSwan