Dense Cores and Star-Formation Activities in the Chamaeleon Dark-Cloud Complex

Details Dense Cores and Star-Formation Activities in the Chamaeleon Dark-Cloud Complex Dense Cores and Star-Formation Activities in the Chamaeleon Dark-Cloud Complex

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..859m&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.859-870.

Astronomy and Astrophysics

Astronomy

42

Ism: Clouds, Ism: Individual (Chamaeleon Dark Clouds), Ism: Molecules, Stars: Formation, Stars: Pre, Main Sequence

Scientific paper

We carried out a C18O (J = 1-0) survey for dense molecular cores in the Chamaeleon (Cha) I, II, and III dark clouds with the NANTEN millimeter-wave telescope. The present survey covered ~ 93% of the area where the molecular column density is greater than ~ 4 x 1021 cm-2, estimated from preceding 13CO\ (J = 1-0) observations. We identified 23 C18O cores, whose typical mass, radius, peak column density, line width are 22 MO , 0.22 pc, 9.7 x 1021 cm-2, and 0.82 km s-1, respectively. The surface density of classical T Tauri stars abruptly increases for the area whose column density is greater than 1022 cm-2, suggesting that this value gives a certain threshold value for star formation. The 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) a high column density, (2) being almost in virial equilibrium, and (3) a high M_core/M_cloud 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 a well-evolved or well gravitationally relaxed cloud-core system, which is probably related to the very high star-formation activity in the cloud.

Affiliated with

Also associated with

No associations

Rating

Dense Cores and Star-Formation Activities in the Chamaeleon Dark-Cloud Complex does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dense Cores and Star-Formation Activities in the Chamaeleon Dark-Cloud Complex, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dense Cores and Star-Formation Activities in the Chamaeleon Dark-Cloud Complex will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1583405