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Astrometric observations of water maser sources toward the Galactic Center with VLBI

Published online by Cambridge University Press:  07 February 2024

Daisuke Sakai Open the ORCID record for Daisuke Sakai [Opens in a new window] ,
Tomoaki Oyama ,
Hideyuki Kobayashi  and
Mareki Honma Open the ORCID record for Mareki Honma [Opens in a new window]
Daisuke Sakai*
Affiliation:
National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan.
Tomoaki Oyama
Affiliation:
National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan.
Hideyuki Kobayashi
Affiliation:
National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan. National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
Mareki Honma
Affiliation:
National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan. Department of Astronomy, Graduate School of Science, The University of Tokyo, Tokyo, 181-8588, Japan
*
email: daisuke.sakai@nao.ac.jp
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Abstract

The Central Molecular Zone (CMZ) in the Galactic Center region shows outstanding non-circular motion unlike the Galactic disk. While several models describing this non-circular motion have been proposed, a uniform kinematic model of the CMZ orbit has not yet emerged. To uncover the dynamics of the Galactic center region, we conducted VLBI astrometric observations of 22GHz water maser sources towards the Galactic center using VERA. By measuring parallaxes and proper motions, we can determine whether each source is actually located in the CMZ or not, and identify the three-dimensional positions and velocities in the non-circular orbit if the source is indeed located in the CMZ. We present the results of our astrometric study for several maser sources associated with molecular clouds towards the Galactic center. The astrometric observations toward Sgr B2(M) indicated that Sgr B2 complex is moving toward the positive Galactic longitude relative to Sgr A*.

Keywords

Galaxy:kinematics and dynamicsmasersinstrumentation:interferometersparallaxes
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. 122 - 124
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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References

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