Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.349t&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Other
Scientific paper
We explore the evolution of molecular abundances in contracting prestellar cores by simulating simultaneously dynamical and nonequlibrium chemical processes. We model both magnetic cores, with varying degrees of initial magnetic support, and non-magnetic cores, with varying collapse retardation times. We explore, through a parameter study, the competing effects of various model parameters in the evolving molecular abundances, including the C/O ratio and the cosmic-ray ionization rate. We find that different models show their largest quantitative differences at the center of the core, while the outer layers, which evolve much less, have abundances which are severely degenerate between different dynamical models. Since even observations of resolved cores sample large amounts of matter in the outer core layers along the line of sight, most of the differences between dynamical models are smeared out. This effect, compounded with uncertainties induced by other model parameters, makes it difficult to discriminate between dynamical models using chemical abundanecs. To amend these difficulties, we identify abundance ratios between particular molecules, the measurement of which would have maximal potential for discrimination between different models.
Tassis Konstantinos
Turner Neal
Willacy Karen
Yorke Harold
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