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Internal Proper Motion of 6.7 GHz Methanol Masers in Ultra Compact HII Region S269

Published online by Cambridge University Press:  24 July 2012

S. Sawada-Satoh ,
K. Fujisawa ,
K. Sugiyama ,
K. Wajima  and
M. Honma
S. Sawada-Satoh
Affiliation:
Mizusawa VLBI Observatory, NAOJ, Mizusawa, Oshu, Iwate, 023-0861Japan email: satoko.ss@nao.ac.jp
K. Fujisawa
Affiliation:
Dept. of Physics, Yamaguchi University, Yoshida, Yamaguchi, 753-8512Japan
K. Sugiyama
Affiliation:
Dept. of Physics, Yamaguchi University, Yoshida, Yamaguchi, 753-8512Japan
K. Wajima
Affiliation:
Dept. of Physics, Yamaguchi University, Yoshida, Yamaguchi, 753-8512Japan
M. Honma
Affiliation:
VERA Project, NAOJ, Osawa, Mitaka, Tokyo, 181-8588Japan
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Abstract

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We present the internal proper motion of 6.7-GHz methanol masers in S269, an Ultra Compact HII region. The maser distribution in S269 consists of several maser groups, and the spatial structure of the main groups A and B are consistent with the past VLBI image. The remarkable result of comparing the two VLBI maps is that 6.7-GHz methanol maser distribution and velocity range within each group have been kept for eight years. Angular separation between the two groups A and B increases by 3.6 mas, which corresponds to a velocity of 11.5 km s−1.

Keywords

masers – ISM: HII regions – stars: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S287: Cosmic Masers - from OH to H0 , January 2012 , pp. 188 - 189
Copyright
Copyright © International Astronomical Union 2012

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