Rapid time variations of water maser emission in W3(OH) and NGC 6334C

被引：0
|
作者：
Xu, Y [1 ]
Zheng, XW
Zhang, FJ
Yu, ZY
Han, P
Scalise, E
Chen, YJ
机构：
[1] Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
[2] Chinese Acad Sci, Chinese Natl Observ, Beijing 100080, Peoples R China
[3] Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China
[4] Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
来源：
ASTRONOMY & ASTROPHYSICS | 2000年 / 364卷 / 01期
关键词：
masers; stars : formation; ISM : individual objects : NGC 6334F; ISM : individual objects : W3(OH);
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report the observed results of a short time scale monitoring of the 22 GHz water maser emission in W3(OH) and NGC 6334C. Both sources were monitored daily for about a month. The aim of the observations is to investigate the possible presence of very short interval variations on time scales of hours or days. Our observations showed that the flux density of the component at -52.8 km s(-1) in W3(OH) decayed linearly with a timescale of about 19 days, and a maser in NGC 6334C flared rapidly, doubling the flux with a timescale of about 4 days. The rapid time variability of the observed water maser features may be caused by an external pumping event. The collision among dense clumps at sufficient relative velocities supplies the powerful energy required to excite H2O maser emission and then quenches the pump in the following days or longer period.
引用
收藏
页码：232 / 236
页数：5
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