Observations of the 86 GHz SiO maser sources in the Central Parsec of the Galactic Centre

Borkar, A.; Eckart, A.; Straubmeier, C.; Sabha, N.; Sjouwerman, L. O.; Karas, Vladimír; Kunneriath, D.; Moser, Lydia; Britzen, S.; Valencia-Schneider, M.; Donea, Alina-Catalina; Zensus, A.

doi:10.22323/1.362.0033

Cited by 1 publication

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“…Observations of the GC over the past several decades have identified at least 28 stellar SiO masers within a few parsecs of Sgr A* (e.g. Menten et al 1997;Reid et al 2007;Li et al 2010;Borkar et al 2020;Paine & Darling 2022), and a subset of these maseremitting stars are bright IR sources used for the reference frame. Menten et al (1997) first proposed measuring the SiO proper motions relative to the Sgr A* radio continuum and matching the radio positions to the IR counterparts to determine the location of Sgr A* in IR images and establish a reference frame where Sgr A* is at rest.…”

Section: Stellar Sio Masers In the Galactic Centermentioning

confidence: 99%

Kinematics in the Galactic Center with SiO masers

Paine,

Darling

2022

Proc. IAU

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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*.

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