Protostellar Collapse in Dense Cores in Taurus

Details Protostellar Collapse in Dense Cores in Taurus Protostellar Collapse in Dense Cores in Taurus

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..153o&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

Computer Science

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Scientific paper

We present the results of a survey for dense molecular condensations in Taurus and the succeeding detection of a high-density condensation that is very close to the moment of the formation of a protostellar core within a time scale of ~104 yr. We have carried out a survey for dense molecular condensations with the 45-m telescope at Nobeyama in H13CO+ (J=1-0) on the basis of a complete C18O survey made with the 4-m telescope at Nagoya. We detected ~55 dense condensations, of which ~45 are starless. These starless condensations are compact (R <~ 0.1 pc) and of high-density (~ 105 cm-3) and thus are highly probable candidates for protostellar condensations. One of the starless condensations, named MC 27 in our catalog, is the densest, ~106 cm-3, based on the observation in H13CO+ (J=1-0, 3-2). A statistical analysis indicates a very short time scale of ~104 yr. These properties strongly suggest that MC 27 is in a very early stage of star formation. The HCO+(J=3-2, 4-3) profiles show the existence of an infalling envelope. The derived infall velocity profile can be explained by a dynamical-collapse model of supercritical condensation prior to formation of the first protostellar core by ~103-4 yr.

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