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Japanese VLBI network observations of 6.7-GHz methanol masers I. Array

Published online by Cambridge University Press:  01 March 2007

Akihiro Doi ,
Kenta Fujisawa ,
Mareki Honma ,
Koichiro Sugiyama ,
Yasuhiro Murata ,
Nanako Mochizuki  and
Yasuko Isono
Akihiro Doi
Affiliation:
Faculty of Science, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, Yamaguchi 753-8512, Japan Present address: The Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan.
Kenta Fujisawa
Affiliation:
Faculty of Science, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, Yamaguchi 753-8512, Japan
Mareki Honma
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Koichiro Sugiyama
Affiliation:
Faculty of Science, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, Yamaguchi 753-8512, Japan
Yasuhiro Murata
Affiliation:
The Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa229-8510, Japan.
Nanako Mochizuki
Affiliation:
The Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa229-8510, Japan.
Yasuko Isono
Affiliation:
Faculty of Science, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, Yamaguchi 753-8512, Japan
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Abstract

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The Japanese VLBI network (JVN) has begun observations of 6.7-GHz methanol masers associated with massive star-forming regions. The JVN is a newly-established VLBI array with baselines ranging from 50 to 2560 km spread across the Japanese islands. Three observing bands of 6.7, 8.4, and 22 GHz are now available. The array consists of ten antennas: VERA Mizusawa 20 m, VERA Ishigaki 20 m, VERA Iriki 20 m, Usuda 64 m, Yamaguchi 32 m, Tomakomai 11 m, Tsukuba 32 m, Kashima 34 m, VERA Ogasawara 20 m, and Gifu 11 m, the first five of which have 6.7-GHz receiving systems. In summer 2005, we obtained the first fringes at 6.7 GHz, and VLBI images of 12 methanol maser sites including seven that had not previously been imaged with VLBI at this band. In 2006 summer, we obtained phase-reference observations toward several methanol maser sites.

Keywords

masersinstrumentation: interferometersradio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 148 - 149
Copyright
Copyright © International Astronomical Union 2008

References

Kobayashi, H., et al. 2003, ASP Conf. Ser. 306, p. 367Google Scholar
Shibata, K. M., Kameno, S., Inoue, M., & Kobayashi, H. 1998, ASP Conf. Ser. 144, p. 413CrossRefGoogle Scholar