Computer Science
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atnf.prop.3537f&link_type=abstract
ATNF proposal C2435, Semester: October, 2010
Computer Science
Star Formation, Atca
Scientific paper
We have recently performed a search for free-free continuum emission towards a sample of high-mass, star forming molecular clumps identified from single-dish observations of the 1.2 mm continuum and CS line emission. Our aim is to image a sub-sample of these clumps in the water maser line and four ammonia inversion transitions. The targets correspond to the earliest star formation phase: 25 IR-dark clumps plus a comparable number (15) of luminous, massive clumps undetected in our cm continuum survey with ATCA. Our goal is to verify the model by Molinari et al. (2008), which describes the evolution of a massive star from the prestellar phase to the main sequence. For this purpose we will use the ammonia lines to estimate the gas temperature and turbulence, and the water maser line to reveal embedded stars. Our expectation is that IR-dark sources will be colder, less turbulent, and less associated with H2O masers than IR-bright. The temperature estimates, combined with our previous 1.2 mm continuum measurements, will permit to obtain a better estimate of the clump masses and thus locate our sources more precisely on the evolutionary diagram of Molinari et al. (2008).
Beltran Maite
Brand Jan
Burton Michael
Cesaroni Riccardo
Dodson Richard
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