ar X iv : a st ro - p h / 99 12 17 5 v 2 9 D ec 1 99 9 Does Infall End Before the Class I Stage ?


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… (More)


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