1212.0084 (Nan Li et al.)

A CO and its isotope line survey for the possible cloud-cloud collision candidates    [PDF]

Nan Li, Jun-Jie Wang

In the 12CO (J=1-0) survey for the 1331 cold IRAS sources, 214 sources show the multiple-peak profiles and are selected as cloud-cloud collision candidates. In January 2005, 201 sources are detected with 12CO(1-0), 13CO(1-0), and C18O(1-0) emission by the 13.7m telescope of Purple Mount Observatory. This is the first CO and its isotope line survey toward the possible cloud-cloud collision regions. According to the statistics of the 201 sources in Galactic distribution, the 201 sources show the similar distribution to the parent sample (1331 cold IRAS sources). These sources are located over a wide range of the Galactocentric distances, and associated with the star formation region partly. Based on preliminary criteria which describe the spectrum properties of the possible cloud-cloud collision region, the 201 sources are classified into 4 types by the fit of the spectrum profiles between the optically thick and thin lines toward each source. The survey is focused on the possible cloud-cloud collision regions, and gives some evidences to help us with selecting the target region. Then we will carry on the mapping and multi-wavelength study for the selected region in future.

View original: http://arxiv.org/abs/1212.0084