Dense Core Survey toward the Chamaeleon Dark Cloud Complex with the NANTEN Radio Telescope

Details Dense Core Survey toward the Chamaeleon Dark Cloud Complex with the NANTEN Radio Telescope Dense Core Survey toward the Chamaeleon Dark Cloud Complex with the NANTEN Radio Telescope

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999alma.confe..39m&link_type=abstract

Science with the Atacama Large Millimeter Array (ALMA), Associated Universities, Inc., held October 6-8, 1999 at Carnegie Instit

Computer Science

Dense, Molecular Gas, Chamaeleon-Musca, Cloud, Nanten, Core, Star Formation

Scientific paper

We carried out 13CO and C18O (J=1-0) surveys for dense molecular gas toward the Chamaeleon-Musca dark cloud complex with the NANTEN 4-m millimeter-wave telescope. The 13CO survey covered ~ 16 deg x 17 deg area, and 25 small dense clouds are identified in addition to the four previously known large clouds. The C18O survey were made toward the Chamaeleon (Cha) I, II, and III clouds, and we identified 23 C18O dense cores. The typical mass, radius, peak column density, line-width of the C18O cores are 22 MSun, 0.22 pc, 9.7 x 1021 cm-2, and 0.82 km s-1, respectively. The surface density of CTTSs abruptly increases for the area whose column density is greater than 1022 cm-2, suggesting that this value gives a certain threshold for star formation. Star formation efficiency varies over a wide range among the three clouds, 13%, 1%, and 0% in Cha I, II, and III, respectively. The C18O cores in Cha I are characterized by (1) high column density, (2) being almost in virial equilibrium, and (3) high Mcore/Mcloud ratio. The cores in Cha III show the opposite trend, and those in Cha II are in between. Such trends suggest that Cha I is well-evolved or well gravitationally relaxed cloud-core system, which is probably related to the very high star formation activity in the cloud.

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