Astrophys. J., Suppl. Ser., 171, 478-492 (2007/August-0)
AST/RO 13CO(J = 2⟶1) and 12CO(J = 4⟶3) mapping of southern Spitzer c2d small clouds and cores.
LOHR A., BOURKE T.L., LANE A.P., MYERS P.C., PARSHLEY S.C., STARK A.A. and TOTHILL N.F.H.
Abstract (from CDS):
Forty molecular cloud cores in the southern hemisphere from the initial Spitzer Space Telescope Cores-to-Disks (c2d) Legacy program source list have been surveyed in 13CO(2⟶1), 12CO(4⟶3), and 12CO(7⟶6) with the Antarctic Submillimeter Telescope and Remote Observatory (AST/RO). The cores, 10 of which contain embedded sources, are located mostly in the Vela, Ophiuchus, Lupus, Chamaeleon, Musca, and Scorpius complexes. 12CO(7⟶6) emission was undetected in all 40 clouds. We present data of 40 sources in 13CO(2⟶1) and 12CO(4⟶3), significant upper limits of 12CO(7⟶6), as well as a statistical analysis of the observed properties of the clouds. We find the typical 13CO(2⟶1) line width to be 2.0 km/s for cores with embedded stars and 1.8 km/s for all others. The typical 12CO(4⟶3) line width is 2.6-3.7 km/s for cores with known embedded sources, and 1.6-2.3 km/s for all others. The average 13CO column density derived from the line intensities was found to be 1.9x1015/cm2 for cores with embedded stars and 1.5x1015/cm2 for all others. The average kinetic temperature in the molecular cores, determined through a large velocity gradient analysis of a set of nine cores, has an average lower limit of 16 K and an average upper limit of 26 K. The average molecular hydrogen density has an average lower limit of 102.9/cm3 and an average upper limit of 103.3/cm3 for all cores. For a different subset of nine cores, we have derived masses. They range from 4 to 255 M☉. Overall, our c2d sample of southern molecular cores has a range of properties (line width, column density, size, mass, embedded stars) similar to those of past studies.
ISM: Clouds - ISM: Molecules - Radiative Transfer - Radio Lines: ISM - Stars: Formation - Submillimeter
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