A submillimeter observation and study of star-forming regions

作     者：JIANG Linhua, WU Yuefang & M. MillerDepartment of Astronomy, Peking University, Beijing 100871, China Chinese Academy of Sciences-Peking University Joint Beijing Astrophysics Center, Beijing 100871, China I. Physikalisches Institut, Zulpicher Str 

作者机构：Department of Astronomy Peking University Beijing China Chinese Academy of Sciences-Peking University Joint Beijing Astrophysics Center Beijing China I. Physikalisches Institut Koeln 41 Germany 

出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)

年 卷 期：2002年第47卷第1期

页      面：16-21页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：This work was supported by the National Key Basic Research Foundation (Grant No. G1999075405) the National Nartural Science Foundation of China (Grant No. 19773002). 

主　　题：dynamics of interstellar medium jets and outflows star formation. 

摘      要：Using the 3-m radio telescope of KOSMA, we mapped 12CO (J = 3-2) lines for three molecular clouds, B35, S146 and TMC-2A. High-velocity molecular outflows are found in all these regions. The physical and dynamical pa-rameters of the outflows are derived, and their shapes and driving sources are analyzed. Contour maps of center veloci-ties show that the large scale systematic gradients exist in the three clouds. These observed motions are best explained by rotation after excluding the cause of outflows. Furthermore, in the core region of TMC-2A there is a velocity gradient in opposite direction from that of the large scale. It may be caused by magnetic braking. Finally, angular velocities of the clouds are calculated, and the effects of rotation against gravity and lowering the star-formation rate are also ana-lyzed.