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Japanese VLBI network observations of 6.7-GHz methanol masers II. Results

Published online by Cambridge University Press:  01 March 2007

Koichiro Sugiyama ,
Kenta Fujisawa ,
Mareki Honma ,
Akihiro Doi ,
Nanako Mochizuki ,
Yasuhiro Murata  and
Yasuko Isono
Koichiro Sugiyama
Affiliation:
Faculty of Science, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, Yamaguchi 753-8512
Kenta Fujisawa
Affiliation:
Faculty of Science, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, Yamaguchi 753-8512
Mareki Honma
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588
Akihiro Doi
Affiliation:
The Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510
Nanako Mochizuki
Affiliation:
The Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510
Yasuhiro Murata
Affiliation:
The Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510
Yasuko Isono
Affiliation:
Faculty of Science, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, Yamaguchi 753-8512
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Abstract

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We are using a Japanese VLBI network (JVN) for VLBI observations of 6.7-GHz methanol masers associated with massive star-forming regions. Here we present results for Cepheus A (Cep A) from observations taken on September 9, 2006. The distribution of the maser spots indicates either a spherical bubble or a disk having an inclination of several tens degree. We construct a disk model with an inclination of ~70° and a radius of ~700 AU. From a luminosity of 1.7 × 104L⊙ for a source observed in this region, the excitation of the maser is probably radiative.

Keywords

masersstars: formationH II regionsISM: individual (Cepheus A)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 176 - 177
Copyright
Copyright © International Astronomical Union 2008

References

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