Computer Science
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atnf.prop.2772m&link_type=abstract
ATNF proposal P706, Semester: October, 2009
Computer Science
Star Formation, Interstellar Medium In And Around The Milky Way, Parkes
Scientific paper
The low-mass starless cores, the simplest units of star formation display an early-stage of chemical evolution with an abundance of molecules such as CO, C2S, C3S. These vanish near the center of cores, where the abundance decreases by at least several orders of magnitude with respect to the outer core. At the same time, the late-stage chemical evolution molecules such as NH3 and N2H+ increase in abundance toward the core center. This scenario contradicts laboratory results which show the parent molecule to NH3 and N2H+ (H2) should deplete at the same rate as CO. To obtain a wider sample of starless cores, this proposal seeks to use Parkes NH3 and C2S observations to identify starless cores associated with 1.2mm dust emission in the R Corona Australis complex. The current observations will determine density, temperature as well as the proportion of thermal and turbulent motions. The C2S and NH3 observations will also allow us to explore chemical maturity of each source. A future ATCA proposal will map N2H+ and NH3 in detected starless cores to determine morphology and relative abundances
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