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High-cadence 6.7 GHz methanol maser monitoring observations by Hitachi 32-m radio telescope

Published online by Cambridge University Press:  07 February 2024

Yoshinori Yonekura Open the ORCID record for Yoshinori Yonekura [Opens in a new window] ,
Yoshihiro Tanabe Open the ORCID record for Yoshihiro Tanabe [Opens in a new window]  and
Ren Moriizumi
Yoshinori Yonekura*
Affiliation:
Center for Astronomy, Ibaraki University, Mito, Ibaraki 310-8512, Japan.
Yoshihiro Tanabe
Affiliation:
Center for Astronomy, Ibaraki University, Mito, Ibaraki 310-8512, Japan.
Ren Moriizumi
Affiliation:
Graduate School of Science and Engineering, Ibaraki University, Mito, Ibaraki 310-8512, Japan
*
email: yoshinori.yonekura.sci@vc.ibaraki.ac.jp
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Abstract

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We started high-cadence monitoring observations of 6.7 GHz methanol masers from Dec. 2012 using Hitachi 32-m radio telescope (Yonekura et al.(2016). Observations have been conducted basically every day. On average, 13 hours of observations have been made per day, amounting to 4000–5000 hours per year. The cadence varies by sources: one observation in 1–50 days. In addition to already known 29 sources (Tanabe et al. 2023 and references therein), we have newly identified ∼20 sources with periodic flux variability. We have also detected 5 sources with sudden flux rises in 2019–2022, including G358.93–0.03 which was confirmed to be associated with the accretion burst.

Keywords

masersstars:formationstars:massivestars:flare
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S380: Cosmic Masers: Proper Motion toward the Next-Generation Large Projects , December 2022 , pp. 269 - 272
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

References

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