Volume 380, Number 2, December III 2001
|Page(s)||665 - 672|
|Published online||15 December 2001|
A search for massive dense cores with CO J = 1-0 line*
Astronomy Department, CAS-PKU Joint Beijing Astrophysics Center, Peking University, Beijing 100871, PR China
Corresponding author: Y. Wu, firstname.lastname@example.org
Accepted: 15 October 2001
This paper reports 13CO -0 line observations toward 107 IRAS or H2O maser sources with the 13.7 m telescope of the Purple Mountain Observatory (PMO). Parameters of emission components are obtained and the profile characteristics are identified. For all the components, kinematic distances are derived. The bolometric luminosities of the corresponding IRAS sources are calculated for 95 sources, all of which are larger than 103 . We also mapped eight sources. Results show that there are cores in the clouds. The sizes of the cores are about 1~3 pc, much greater and more extensive than those of cores in dark clouds. The hydrogen densities are ~102-103 cm-3. Systematic velocity shifts were found in 3 sources. Every mapped core contains one or more IRAS source. Each core has one and only one IRAS source that satisfies the criteria of ultra compact HII (UC HII) regions. For the cores, 2MASS data are available; dozens of 2MASS sources with different color indices and brightness are found within the core.
Key words: stars: formation / ISM: clouds / ISM: kinematics and dynamics
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.