Does Infall End Before the Class I Stage?

Details Does Infall End Before the Class I Stage? Does Infall End Before the Class I Stage?

1999-12-08

arxiv.org/abs/astro-ph/9912175v2

Astronomy and Astrophysics

Astrophysics

21 pages, 8 figures, accepted by ApJ for April 20, 2000, added acknowledgment

Scientific paper

10.1086/308665

We have observed HCO+ J=3-2 toward 16 Class I sources and 18 Class 0 sources, many of which were selected from Mardones et al. (1997). Eight sources have profiles significantly skewed to the blue relative to optically thin lines. We suggest six sources as new infall candidates. We find an equal "blue excess" among Class 0 and Class I sources after combining this sample with that of Gregersen et al. (1997). We used a Monte Carlo code to simulate the temporal evolution of line profiles of optically thick lines of HCO+, CS and H2CO in a collapsing cloud and found that HCO+ had the strongest asymmetry at late times. If a blue-peaked line profile implies infall, then the dividing line between the two classes does not trace the end of the infall stage.

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