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题名: Techniques for Accurate Parallax Measurements for 6.7 GHz Methanol Masers
作者: Reid, M. J.; Brunthaler, A.; Menten, K. M.; Sanna, A.; Xu, Y.; Li, J. J.; Wu, Y.; Hu, B.; Zheng, X. W.; Zhang, B.; Immer, K.; Rygl, K.; Moscadelli, L.; Sakai, N.; Bartkiewicz, A.; Choi, Y. K.
刊名: ASTRONOMICAL JOURNAL
出版日期: 2017
卷号: 154, 期号:2, 页码:63-
英文摘要: The BeSSeL Survey is mapping the spiral structure of the Milky Way by measuring trigonometric parallaxes of hundreds of maser sources associated with high-mass star formation. While parallax techniques for water masers at high frequency (22 GHz) have been well documented, recent observations of methanol masers at lower frequency (6.7 GHz) have revealed astrometric issues associated with signal propagation through the ionosphere that could significantly limit parallax accuracy. These problems displayed as a "parallax gradient" on the sky when measured against different background quasars. We present an analysis method in which we generate position data relative to an "artificial quasar" at the target maser position at each epoch. Fitting parallax to these data can significantly mitigate the problems and improve parallax accuracy.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17433
Appears in Collections:紫金山天文台青海观测站_期刊论文

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