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Kinematics in the Galactic Center with SiO masers

Published online by Cambridge University Press:  07 February 2024

Jennie Paine Open the ORCID record for Jennie Paine [Opens in a new window]  and
Jeremy Darling
Jennie Paine*
Affiliation:
Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences University of Colorado, 389 UCB, Boulder, CO 80309-0389, USA.
Jeremy Darling
Affiliation:
Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences University of Colorado, 389 UCB, Boulder, CO 80309-0389, USA.
*
email: [email protected]
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Abstract

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Stellar SiO masers are found in the atmospheres of asymptotic giant branch (AGB) stars with several maser transitions observed around 43 and 86 GHz. At least 28 SiO maser stars have been detected within ∼2 pc projected distance from Sgr A* by the Very Large Array (VLA) and Atacama Millimeter/submillimeter Array (ALMA). A subset of these masers have been studied for several decades and form the basis of the radio reference frame that anchors the reference frame for infrared stars in the Galactic Center (GC). We present new observations of the GC masers from VLA and ALMA. These new data combined with extant maser astrometry provide 3D positions, velocities, and acceleration limits. The proper motions and Doppler velocities are measured with unprecedented precision for these masers. We further demonstrate how these measurements may be used to trace the stellar and dark matter mass distributions within a few pc of Sgr A*.

Keywords

Silicon monoxide masersstellar masersGalactic Centerstellar kinematics
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. 101 - 105
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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