NANTEN Observations of the Southern Coalsack in 13CO and C18O\ J = 1-0 Emission

Details NANTEN Observations of the Southern Coalsack in 13CO and C18O\ J = 1-0 Emission NANTEN Observations of the Southern Coalsack in 13CO and C18O\ J = 1-0 Emission

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..883k&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.883-893.

Astronomy and Astrophysics

Astronomy

17

Ism: Clouds, Ism: Individual (Southern Coalsack), Ism: Molecules, Stars: Formation

Scientific paper

We made observations of the 13CO and C18O\ J = 1-0 emission toward the Southern Coalsack. The 13CO observations covered the whole extent of the main cloud with a 2.'7 beam at an 8' or 4' grid spacing. The 13CO emitting gas is highly clumpy, consisting of small ``cloudlets" of <~ 0.4 pc diameter. The densest and most massive cloudlet, whose mass is ~ 200 MO , is coincident with the region of the heaviest visual extinction, located at the western edge of the cloud. The total mass of the 13CO emitting gas amounts to ~ 600 MO , corresponding to only ~ 17% of the total cloud mass estimated from 12CO observations. In addition, toward the densest region in 13CO we made C18O\ J = 1-0 observations. We found five C18O dense cores, in agreement with well-known optically dark globules, and identified these dense cores to be potential sites of star formation, as indicated by their high column density, which is typical of star-forming cores. On the other hand, a comparison of the 13CO and C18O distributions with young stellar objects detected as IRAS point sources indicates no sign of recent star formation in the Southern Coalsack.

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