Abstract We have mapped 23 sources in the J=1--0 lines of 12CO, 13CO and C18O with the 13.7-m telescope at Qinghai station of Purple Mountain Observatory.The samples were chosen from the massive star formation regions whose single point lines have the broad-wing profile. The mapping shows that 12 clouds have cores and 5 outflows were identified with the 12CO CO J=1--0 lines. Among the 12 cores, systematic velocity shifts were found in 2 cores, and blue asymmetric double-peak profile of 12CO line was found in IRAS 19529+2704, indicating that it may be an infall candidate. Physical parameters of the cores and outflows were derived from the local thermodynamic equilibrium assumption.The masses range from $\sim 9.4\times 10^2M_{\odot }$ to $\sim 2.2\times 10^5M_{ \odot }$. The hydrogen molecule densities range from $\sim3.4\times10^2$cm-3 to $\sim 1.2\times 10^4$ cm-3. The molecular outflows have masses larger than 3.5$M_{ \odot }$, and kinetic energies greater than 0.9$\times$1038J. The outflows have significantly greater masses and kinetic energies than those from low-mass young stellar objects (YSOs). For the cores, 2MASS data are available, dozens of 2MASS sources with different colour indices and brightness are often found around IRAS source, among which the reddest 2MASS source is always within the IRAS error ellipse thus probably corresponds to the IRAS source.
Received: 21 July 2004
Revised: 13 December 2004
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 10133020, 10128306 and 10203003) and the National Key Basic Research Science Foundation (Grant No 1999075405)
Cite this article:
Zhou Wu-Fei (周武飞), Wu Yue-Fang (吴月芳), Wei Yue (魏悦), Ju Bing-Gang (巨秉刚) Massive molecular cloud cores and activities of star formation 2005 Chinese Physics 14 863
No related articles found!
No Suggested Reading articles found!
Viewed
Full text
Abstract
Cited
Altmetric
blogs
tweeters
Facebook pages
Wikipedia page
Google+ users
Online attention
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
