The G305 star forming complex: Wide-Area molecular mapping of NH3 and H2O masers - Astrophysics > Astrophysics of GalaxiesReportar como inadecuado




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Abstract: We present wide area radio 12 mm Mopra Telescope observations of thecomplex and rich massive star forming region G305. Our goals are to determinethe reservoir for star formation within G305 using NH3 to trace the densemolecular content, and thus, the gas available to form stars; estimate physicalparameters of detected NH3 clumps temperature, column density, mass etc;locate current areas of active star formation via the presence of H2O andmethanol masers and the distribution of YSOs and ultra compact HII regionsassociated with this region. This paper details the NH3 J,K, 1,1, 2,2 and3,3 inversion transition and 22 GHz H2O maser observations. We observed a\sim 1.5\circ x 1\circ region with \sim 2- angular resolution and a sensitivityof \sim 60 mK per 0.4 km s^-1 channel. We identify 15 NH3 1,1, 12 NH3 2,2and 6 NH3 3,3 clumps surrounding the central HII region. The sizes of theclumps vary between < 2.6 and 10.1 pc, the average kinetic temperature of thegas is 25 K. We calculate clump masses of > 10^4 M\odot and find the totalmolecular mass of the complex to be \sim 6x10^5 M\odot. We note the positionsof 56 star formation tracers, and discover a high degree of correlation withdetected NH3 clumps. We have detected 16 H2O masers, find they correlate withthe detected ammonia clumps and in general are found closer to the NH3 clumpcores than star formation tracers of later evolutionary stages.



Autor: L.Hindson, M.A. Thompson, J.S. Urquhart, J.S. Clark, B. Davies

Fuente: https://arxiv.org/



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