1. Tianma 65-m telescope detection of new OH maser features towards the water fountain source IRAS 18286–0959.
- Author
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Xi Chen, Zhi-Qiang Shen, Xiao-Qiong Li, Kai Yang, Jun-ichi Nakashima, Ya-Jun Wu, Rong-Bin Zhao, Juan Li, Jun-Zhi Wang, Dong-Rong Jiang, Jin-Qing Wang, Bin Li, Wei-Ye Zhong, and Yung, Bosco H. K.
- Subjects
STAR observations ,ASTRONOMICAL observations ,TRANSITION lineshape ,ATOMIC transitions ,ATOMIC spectra - Abstract
We report the results of the OH maser observation towards the water fountain source IRAS 18286–0959 using the newly built Shanghai Tianma 65-m Radio Telescope. We observed the three OH ground state transition lines at frequencies of 1612, 1665 and 1667 MHz. Comparing with the spectra of previous observations, we find new maser spectral components at velocity channels largely shifted from the systemic velocity: the velocity offsets of the newly found components lie in the range 20-40 km s
-1 with respect to the systemic velocity. Besides maser variability, another possible interpretation for the newly detected maser features is that part of the molecular gas in the circumstellar envelope is accelerated. The acceleration is probably caused by the passage of a high-velocity molecular jet, which has been detected in previous Very Long Baseline Interferometry observations in the H2 O maser line. [ABSTRACT FROM AUTHOR]- Published
- 2017
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