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HOW DO MASSIVE STARS FORM? INFALL & OUTFLOW IN DENSE CORES IN THE MILKY WAY

  • AKHTER, SHAILA. (School of Physics, University of New South Wales, NSW) ;
  • CUNNINGHAM, MARIA R. (School of Physics, University of New South Wales, NSW) ;
  • HARVEY-SMITH, LISA (CSIRO Astronomy and Space Science) ;
  • JONES, PAUL A. (School of Physics, University of New South Wales, NSW)
  • Received : 2014.11.30
  • Accepted : 2015.06.30
  • Published : 2015.09.30

Abstract

Massive stars are some of the most influential objects in the Universe, shaping the evolution of galaxies, creating chemical elements and hence shaping the evolution of the Universe. However, the processes by which they form and how they shape their environment during their birth processes are not well understood. We use $NH_3$ data from "The $H_2O$ Southern Galactic Plane Survey" (HOPS) survey to define the positions of dense cores/clumps of gas in the southern Galactic plane that are likely to form stars. Then, using data from "The Millimetre Astronomy Legacy Team 90 GHz" (MALT90) survey, we search for the presence of infall and outflow associated with these cores. We subsequently use the "3D Molecular Line Radiative Transfer Code" (MOLLIE) to constrain properties of the infall and outflow, such as velocity and mass flow. The aim of the project is to determine how common infall and outflow are in star forming cores, and therefore to provide valuable constraints on the timescales and physical process involved in massive star formation. Preliminary results are presented here.

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References

  1. Walsh, A. J., et al., 2011, The H2O Southern Galactic Plane Survey (HOPS) - I. Techniques and H2O Maser Data, MNRAS, 416, 1764 https://doi.org/10.1111/j.1365-2966.2011.19115.x
  2. Lada, C. J., et al., 2012, Star Formation Rates in Molecular Clouds and the Nature of the Extragalactic Scaling Relations, ApJ, 745, 190 https://doi.org/10.1088/0004-637X/745/2/190
  3. Park Y. -S., 2001, Hyper ne Anomalies in the Ammonia (1,1) Iinversion Transition: Can they be a Tracer of Systematic Motion?, A&A, 376, 348-355 https://doi.org/10.1051/0004-6361:20010933
  4. Jackson, J. M., et al., 2013, MALT90: The Millimetre Astronomy Legacy Team 90 GHz Survey, PASA, 30, e057 https://doi.org/10.1017/pasa.2013.37
  5. Lo, N., Redman, et al., 2011, Observations and Radiative Transfer Modelling of a Massive Dense Cold Core in G333, MNRAS, 415, 525 https://doi.org/10.1111/j.1365-2966.2011.18726.x
  6. Purcell, C. R., et al., 2009, Multi-Generation Massive Star-Formation in NGC 3576, A&A, 504, 139 https://doi.org/10.1051/0004-6361/200811358