N. F. H. Tothill et al. 2009 ApJS 185 98 doi:10.1088/0067-0049/185/1/98
N. F. H. Tothill1,2, A. Löhr1, S. C. Parshley3, A. A. Stark1, A. P. Lane1, J. I. Harnett1,4, G. A. Wright5, C. K. Walker6, T. L. Bourke1 and P. C. Myers1
Show affiliationsFully sampled degree-scale maps of the 13CO 2-1 and CO 4-3 transitions toward three members of the Lupus Molecular Cloud Complex—Lupus I, III, and IV—trace the column density and temperature of the molecular gas. Comparison with IR extinction maps from the c2d project requires most of the gas to have a temperature of 8-10 K. Estimates of the cloud mass from 13CO emission are roughly consistent with most previous estimates, while the line widths are higher, around 2 km s–1. CO 4-3 emission is found throughout Lupus I, indicating widespread dense gas, and toward Lupus III and IV. Enhanced line widths at the NW end and along the edge of the B 228 ridge in Lupus I, and a coherent velocity gradient across the ridge, are consistent with interaction between the molecular cloud and an expanding H I shell from the Upper-Scorpius subgroup of the Sco-Cen OB Association. Lupus III is dominated by the effects of two HAe/Be stars, and shows no sign of external influence. Slightly warmer gas around the core of Lupus IV and a low line width suggest heating by the Upper-Centaurus-Lupus subgroup of Sco-Cen, without the effects of an H I shell.
Issue 1 (2009 November)
Received 2009 March 27, accepted for publication 2009 September 16
Published 2009 October 14
N. F. H. Tothill et al. 2009 ApJS 185 98
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