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The water and methanol masers in the face-on accretion system around the high-mass protostar G353.273+0.641

Published online by Cambridge University Press:  07 February 2024

Kazuhito Motogi Open the ORCID record for Kazuhito Motogi [Opens in a new window] ,
Tomoya Hirota Open the ORCID record for Tomoya Hirota [Opens in a new window] ,
Masahiro N. Machida ,
Kei E. I. Tanaka  and
Yoshinori Yonekura
Kazuhito Motogi*
Affiliation:
1Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, Yamaguchi 753-8512, Japan.
Tomoya Hirota
Affiliation:
Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Oshu, Iwate 023-0861, Japan
Masahiro N. Machida
Affiliation:
Department of Earth and Planetary Sciences, Faculty of Sciences, Kyushu University, Fukuoka, Fukuoka 819-0395, Japan
Kei E. I. Tanaka
Affiliation:
Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo, 152-8551, Japan
Yoshinori Yonekura
Affiliation:
Center for Astronomy, Ibaraki University, Mito, Ibaraki 310-8512, Japan
*
email: [email protected]
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Abstract

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We report on a direct comparison of VLBI maser data and ALMA thermal-emission data for the high-mass protostar G353.273+0.641. We detected a gravitationally-unstable disk by dust and a high-velocity jet traced by a thermal CO line by ALMA long-baselines (LB). 6.7 GHz CH3OH masers trace infalling streamlines inside the disk. The innermost maser ring indicates another compact accretion disk of 30 au. Such a nested system could be caused by angular momentum transfer by the spiral arms. 22 GHz H2O masers trace the jet-accelerating region, which are directly connecting the CO jet and the protostar. The recurrent maser flares imply episodic jet ejections per 1–2 yr, while typical separation of CO knots indicates a variation of outflow rate per 100 yr. Our study demonstrates that VLBI maser observations are still a powerful tool to explore detailed structures nearby high-mass protostars by combining ALMA LB.

Keywords

ISM:jets and outflowsaccretion disksstars: massivestars: protostars
Type
Contributed 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. 172 - 176
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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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