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Astrometry of Water Maser sources in the Outer Galaxy with VERA

Published online by Cambridge University Press:  07 February 2024

Hiroyuki Nakanishi Open the ORCID record for Hiroyuki Nakanishi [Opens in a new window] ,
Nobuyuki Sakai Open the ORCID record for Nobuyuki Sakai [Opens in a new window] ,
Kohei Kurahara Open the ORCID record for Kohei Kurahara [Opens in a new window]  and
VERA Outer Rotation Curve project members
Hiroyuki Nakanishi*
Affiliation:
Graduate School of Science and Engineering, Kagoshima University.
Nobuyuki Sakai
Affiliation:
National Astronomical Research Institute of Thailand
Kohei Kurahara
Affiliation:
National Astronomical Observatory of Japan
*
email: [email protected]
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Abstract

While the rotation curve of the inner Galactic disk is well determined, study of the outer rotation curve requires observational measurements of distances and proper motions of individual sources in the Outer Galaxy. We report astrometric observation for water maser sources in the Outer Galactic disk conducted with VERA, aiming to measure the Outer Rotation Curve. We have measured annual parallaxes and proper motions for these objects. Our result was consistent with recent other works based on astrometry and classical Cepheid observations. Epicyclic frequency seems to suggest that 2 and 4 spiral mode are dominant in the inner and outer Galaxy, respectively.

Keywords

VERAWater MaserMilky Way GalaxyRotation Curve
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. 119 - 121
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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