A search for massive young stellar objects with 98 CH3OH maser sources

作者：Liu Tie^*; Wu Yue Fang; Wang Ke

来源：Research in Astronomy and Astrophysics, 2010, 10(1): 67-82.

• stars: formation
• ISM: clouds
• ISM: methanol maser

Using the 13.7 m telescope of the Purple Mountain Observatory (PMO), a survey of the J = 1 - 0 lines of CO and its isotopes was carried out on 98 methanol maser sources in January 2008. Eighty-five sources have infrared counterparts within one arcmin. In the survey, except for 43 sources showing complex or multiple-peak profiles, almost all the (CO)-C-13 line profiles of the other 55 sources have large line widths of 4.5 km s(-1) on average and are usually asymmetric. Fifty corresponding Infrared Astronomical Satellite (IRAS) sources of these 55 sources have L-bol larger than 10(3) L-circle dot, which can be identified as possible high-mass young stellar sources. Statistics show that the (CO)-C-13 line widths correlate with the bolometric luminosity of the associated IRAS sources. Here, we also report the mapping results of two sources: IRAS 06117+1350 and IRAS 07299-1651. Two cores were found in IRAS 06117+1350 and one core was detected in IRAS 07299-1651. The northwest core in IRAS 06117+1350 and the core in IRAS 07299-1651 can be identified as precursors of UC H-II regions or high-mass protostellar objects (HMPOs). The southeast core of IRAS 06117+1350 has no infrared counterpart, seeming to be at a younger stage than the pre-UC HII phase.

• 出版日期2010-1
• 单位北京大学