A Study of Dense Molecular Gas and Star Formation toward the Vela Molecular Ridge with NANTEN

Details A Study of Dense Molecular Gas and Star Formation toward the Vela Molecular Ridge with NANTEN A Study of Dense Molecular Gas and Star Formation toward the Vela Molecular Ridge with NANTEN

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..775y&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.775-790.

Astronomy and Astrophysics

Astronomy

33

Stars: Formation, Ism: Clouds, Ism: Jets And Outflows, Ism: Molecules, Radio Lines: Ism

Scientific paper

New observations of the J=1-0 12CO, 13CO, and C18O emission lines have been extensively made toward the Vela Molecular Ridge (VMR) with NANTEN. The most prominent cloud is the giant molecular cloud, corresponding to the VMR-C region (Vela C). The present C18O distribution has been identified as 29 clouds. Among them, the most massive one is included in Vela C, having a total mass of ~ 4.4 x 104 MO . The rest of them are smaller C18O clouds of 102-103 MO . Star formation in the region is almost exclusively occurring in the C18O clouds. The luminosities of the associated protostellar IRAS sources range from 5 LO to 1.1 x 104 LO , and the luminosity distribution is found to be well represented by the relation dN_star/dL_IR ~ L_IR-1.65+/-0.14. We find that the ratios of the total luminosity of the sources associated with given C18O clouds to the cloud masses are significantly enhanced for those clouds associated with H {II} regions by an order of magnitude. This is interpreted as meaning that the formation of massive stars is enhanced due to the effects of H {II} regions, as is consistent with the preceding work. We have also newly found molecular outflow toward IRAS 08588-4347 as well as five possible candidates for outflows.

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