C18O Dense Core Survey in Ophiuchus

Details C18O Dense Core Survey in Ophiuchus C18O Dense Core Survey in Ophiuchus

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..167t&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

Physics

Scientific paper

C18O (J=1-0) observations have been made with the 4m telescopes of Nagoya University toward dense regions in Ophiuchus, and 40 dense cores have been identified. The dense cores are distributed not only in the active star forming region of ρ Oph cloud core, but also in the less active North region. The averaged mass and density of the cores are 90 Modot and 1.4 x 104 cm-3 in the ρ Oph region, respectively, and 14 Modot and 8 x 103 cm-3 in the North region, respectively. Only 9 cores are associated with young stellar objects. No clear difference in the physical parameters between star-forming and starless cores is seen except for N(H2). The spectral line width is significantly larger than that of thermal component and thus the cores are dominated by turbulence in n 104 cm-3. To investigate the gravitational stability, the virial theorem is applied to the C18O and 13CO cores and the virial mass, MVIR, is obtained. As the results most of all the 13CO cores have larger MVIR than MLTE while 18 out of the 40 C18O cores do. This implies that the C18O cores are nearly gravitationally bound, while the 13CO cores are typically unbound. We have found that the fraction of 13CO cores associated with C18O cores and that of C18O cores with YSOs both tend to increase with decreasing the ratio of MVIR / MLTE. The dissipation of the turbulent may play an important role of the core-formation and star-formation.

Affiliated with

Also associated with

No associations

Rating

C18O Dense Core Survey in Ophiuchus 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 C18O Dense Core Survey in Ophiuchus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and C18O Dense Core Survey in Ophiuchus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1061334