Jonathan P. Williams and Philip C. Myers 1999 ApJ 518 L37 doi:10.1086/312065
A Contracting, Turbulent, Starless Core in the Serpens Cluster
FREEJonathan P. Williams1,2 and Philip C. Myers1
Show affiliationsWe present combined single-dish and interferometric CS (2-1) and N2H+ (1-0) observations of a compact core in the northwest region of the Serpens molecular cloud. The core is starless according to observations from optical to millimeter wavelengths, but its lines have turbulent widths and "infall asymmetry." Line profile modeling indicates supersonic inward motions vin 
0.34 km s-1 over an extended region L > 12,000 AU. The high infall speed and large extent exceeds the predictions of most thermal ambipolar diffusion models and points to a more dynamical process for core formation. A short (dynamic) timescale, ~105 yr 
L/vin, is also suggested by the low N2H+ abundance, ~1 × 10−10.
- Subject headings
ISM: individual (Serpens); ISM: kinematics and dynamics; stars: formation
- Dates
-
Issue 1 (1999 June 10)
Received 1999 March 15, accepted for publication 1999 April 13
Published 1999 April 26
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A Contracting, Turbulent, Starless Core in the Serpens Cluster
Jonathan P. Williams and Philip C. Myers 1999 ApJ 518 L37
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