Physics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..165h&link_type=abstract
Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam
Physics
1
Scientific paper
We have made an extensive study of dense cloud cores and star formation in the Lupus dark cloud complex. Millimeter-wave observations in the 13CO and C18O (J = 1-0) emission at 2.6 mm wavelength have been made with NANTEN, 4-m mm-wave telescope of Nagoya University at Las Campanas Observatory. Thirty-six dense cores were identified and mapped in the C18O emission at 2' grid spacing with a 2.'7 beam. Typical mass, radius, H2 column density, and line width of the C18O cores are 9.7 Modot, 0.17 pc, 4.1 x 1021 cm-2, 0.90 km s-1, respectively. The mass spectrum of the C18O cores is fitted by a single power low index of γ = -1.7 +/- 0.6 for Mcore >= 3 Modot. The physical parameters of the dense C18O cores are derived and compared with those in Taurus, Ophiuchus North, and L1333. The average characteristics of the C18O cores in Lupus are similar to those in Ophiuchus North and L1333, although those in Taurus are found to be peculiar especially in the line width, virial ratio, and mass spectrum index among the four regions. By comparing the physical properties of the C18O cores with the distribution of YSOs in Lupus, we have confirmed the following trend suggested in the previous studies that star formation preferentially occurs in cores having small virial ratio, Mvir/Mcore, and large H2 column density.
Fukui Yasuo
Hara Akihiro
Mizuno Akira
Onishi Tatsuo
Tachihara Kengo
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