Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944408l&link_type=abstract
American Astronomical Society, AAS Meeting #219, #444.08
Other
Scientific paper
We obtained observations of nearby (d < 300 pc) isolated pre-stellar and Class 0 cores from the Caltech Submillimeter Observatory. The optically thick HCO+ J=3-2 rotational transition was observed in order to detect the blue-asymmetric infall signature often seen in pre-stellar cores. The asymmetric spectral line profiles were analyzed by using a 1-D radiative transfer model that assumes a uniform infall velocity and a realistic radial excitation profile. The model is able to reproduce the asymmetric line profile in most cases by varying only 5 physical cloud parameters. The analysis was used to obtain a reliable estimate of the infall rate. The sources presented here and observed in the HCO+ J=3-2 rotational transition were B228, CB130 SMM2, OPH MM 126, and RCRA SMM1A. Analysis of these spectra yielded some unexpected results. Our analysis did a good job at fitting the spectral lines in some sources while it performed poorly for others. We observed infall velocities ranging from -1.1, indicating expansion, to 0.4 km/s in these sources and found line center optical depths ranging from 0.03 to 520. The peak excitation temperature for the HCO+ J=3-2 transition was found to range from 3 to 57 K.
Arce Hector G.
de Vries Christopher H.
La Cruz David De
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