12 GHz methanol maser outflow from the massive star-forming region： G35.20-0.74

We report the internal proper motions of 12 GHz methanol masers in mas-sive star-forming region G35.20-0.74 observed with the Very Long Baseline Array （VLBA） at four epochs spanning about 1.5 yr. Two groups of maser features were de-tected, groups A and B, and the latter that had a V-shaped spatial...

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Bibliographic Details
Published in:Research in astronomy and astrophysics 2013-07, Vol.13 (7), p.815-826
Main Authors: Yan, Qing-Zeng, Zhang, Bo, Tang, Zheng-Hong, Zheng, Xing-Wu
Format: Article
Language:English
Subjects:
Astronomy
GHz
Inclination
Interstellar matter
Masers
Methyl alcohol
Outflow
Star formation
Stellar winds
三维模型
外流
恒星形成区
甲醇
脉泽
质量
速度梯度
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Summary:We report the internal proper motions of 12 GHz methanol masers in mas-sive star-forming region G35.20-0.74 observed with the Very Long Baseline Array （VLBA） at four epochs spanning about 1.5 yr. Two groups of maser features were de-tected, groups A and B, and the latter that had a V-shaped spatial distribution is likely tracing the north outflow in G35.20-0.74. We present a three-dimensional model for the kinematics of these masers, by assuming the interstellar medium was blown by the stellar wind from the driving source （G35.2N） of the outflow. Adopting a position angle of ～ 81° for the main axis of the outflow from previous studies, we estimate an inclination of 35 ° ± 5.5°, a velocity of 8.1 ± 0.7 km s^-1 for the stellar wind along the main axis and an expansion speed gradient of 0.05 ± 0.016 km s^-1 AU^-1. From the model, we derive the age of the north outflow in G35.20-0.74 to be ～ 1.6 × 10^4 yr.
ISSN:1674-4527
2397-6209
DOI:10.1088/1674-4527/13/7/005