1999A&A...349L..53H

Using the IRAM 30m radiotelescope a dense core in MCLD 123.5+24.9 has been observed in the CS (J=2-1), (3-2) and (5-4) lines. In the lower two rotational lines the cloud extends over 0.03pcx0.15pc at an adopted distance of 150pc. The core harbours three dense condensations with full widths at half maximum between 4500 and 6100 AU. Based on C¹⁸O observations their masses are estimated to be between 0.06 and 0.12M_☉. The southernmost shows asymmetric self-absorbed CS (2-1) and (3-2) lines with the blue shifted part brighter than the red shifted; the velocity of the (5-4) transition is in between the blue and red shifted lines of the lower transitions. These features are well-tested diagnostics of inward motion in molecular clouds. An inward velocity of 4 to 10m/s is estimated from the CS lines.