Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..393..137k&link_type=abstract
The seventh astrophysical conference: Star formation, near and far. AIP Conference Proceedings, Volume 393, pp. 137-140 (1997).
Astronomy and Astrophysics
Astronomy
1
Pre-Main Sequence Objects, Young Stellar Objects And Protostars, Star Formation, Radio, Microwave, Molecular Clouds, H2 Clouds, Dense Clouds, And Dark Clouds
Scientific paper
Fifteen small, apparently starless Bok globules were mapped at high spatial and spectral (0.007 km s-1 channel-1) resolution in the (J=1-->0) rotational line of 13CO using the 14 m radio telescope of the Five College Radio Astronomy Observatory, and the fifteen-element 3 mm array receiver QUARRY. From 120 to 360 positions per globule, sampled with half-beam spacing, were observed in the 13CO line. Gaussian fitting of the emission lines was used to establish mean radial velocities and uncertainties. Each globule radial velocity distribution on the sky was fit to a plane (solid body rotation) to yield mean velocity gradients with position, and rotation axis directions. The globules are rotating at rates about 30 times faster than velocity shifts attributable to local differential Galactic rotation. For globule assumed mean distances of 600 pc, the gradients range in a distinctly bimodal distribution, from 0.089 km s-1 pc-1 (ω~3×10-15 s-1) to 0.950 km s-1 pc-1 (ω~3×10-14 s-1). Detailed examination of the globule rotation curves indicated that the kinematics of ten of fifteen globule cores are well-approximated by solid-body rotation. Differential rotation and shearing motions due to external influences (ram pressure stripping and/or bow shocks) are also seen.
Clemens Dan P.
Kane Brian D.
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