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6.7 GHz Methanol Masers Observation with Phased Hitachi and Takahagi

Published online by Cambridge University Press:  16 July 2018

Kazuhiro Takefuji ,
Koichiro Sugiyama ,
Yoshinori Yonekura ,
Tagiru Saito ,
Kenta Fujisawa  and
Tetsuro Kondo
Kazuhiro Takefuji
Affiliation:
National Institute of Information and Communications Technology, 893-1 Hirai, Kashima, Ibaraki 314-8501, Japan. email: [email protected]
Koichiro Sugiyama
Affiliation:
Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Yoshinori Yonekura
Affiliation:
Center for Astronomy, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
Tagiru Saito
Affiliation:
College of Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
Kenta Fujisawa
Affiliation:
The Research Institute for Time Studies, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, Yamaguchi 753-8511, Japan
Tetsuro Kondo
Affiliation:
National Institute of Information and Communications Technology, 893-1 Hirai, Kashima, Ibaraki 314-8501, Japan. email: [email protected]
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Abstract

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For the high-sensitivity 6.7 GHz methanol maser observations, we developed a new technology for coherently combining the two signals from the Hitachi 32 m radio telescope and the Takahagi 32 m radio telescope of the Japanese VLBI Network. Furthermore, we compared the SNRs of the 6.7 GHz maser spectra for two methods. One is a VLBI method and the other is the newly developed digital position switching, which is a similar technology to that used in noise-cancelling headphones. We report the phase-up technique and the observation.

Keywords

instrumentation: spectrographs techniques: interferometric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 305 - 306
Copyright
Copyright © International Astronomical Union 2018 

References

Takefuji, K., Imai, H., & Sekido, M., 2016, PASJ, 68, 86Google Scholar
Takefuji, K., Sugiyama, K., Yonekura, Y., Saito, T., Fujisawa, K., & Kondo, T., 2017, PASP, 129, 981Google Scholar