II. Accurate Positions and Proper Motions of Stellar SiO Masers near the Galactic Center

Abstract

Menten, Reid, Eckart and Genzel (1997) accurately determined the position of Sgr A* on an infrared image, by aligning the infrared image with positions measured for SiO masers, associated with infrared-bright evolved stars, at radio wavelengths. We now report greatly improved radio positions and, for the first time, proper motions of many stellar SiO masers at the Galactic Center. These positions and motions, coupled with better infrared imaging, allow a much improved location of Sgr A* on infrared images. With current data, infrared stars can be placed in a reference frame tied to Sgr A*, to an accuracy of approximately 10 mas in position and 1 mas/yr in motion. The position of Sgr A* is, within uncertainties, consistent with stellar accelerations and the measured orbital focus of the star S2. The star S2 was observed within 16 mas (130 AU in projection) of Sgr A* on 2002 May 02. Finally, we find that the central stellar cluster moves with Sgr A* to within approximatly 70 km/s.

arXiv comment27 pages, 6 figures, and 6 tables

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• Closest Star Seen Orbiting the Supermassive Black Hole at the Centre of the Milky Way
• Supermassive Black Holes in Galactic Nuclei: Past, Present and Future Research
• Stellar Orbits Around the Galactic Center Black Hole
• The Proper Motion of Sgr A*: II. The Mass of Sgr A*
• The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy's Central Black Hole: A Paradox of Youth
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• The Stellar Cusp Around the Supermassive Black Hole in the Galactic Center
• Stellar dynamics in the central arcsecond of our galaxy
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• The structure of the nuclear stellar cluster of the Milky Way
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• Spin-induced black hole spontaneous scalarization
• Micro-Arcsecond Radio Astrometry
• The Proper Motion of Sagittarius A*: III. The Case for a Supermassive Black Hole
• Dynamics of Ionized Gas at the Galactic Center: VLA Observations of the 3D Velocity Field and Location of the Ionized Streams in Sagittarius A West
• The Milky Way's Supermassive Black Hole: How good a case is it? A Challenge for Astrophysics & Philosophy of Science
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• How to hide large scale outflows: size constraints on the jets of Sgr A*
• Science with the TianQin observatory: Preliminary result on extreme-mass-ratio inspirals
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• Polarized NIR and X-ray Flares from SgrA*
• The Position of Sagittarius A*: III. Motion of the Stellar Cusp
• What is limiting near-infrared astrometry in the Galactic Center?
• Pinpointing the near-infrared location of Sgr A* by correcting optical distortion in the NACO imager
• Is there a Supermassive Black Hole at the Center of the Milky Way?
• Orbital inspiral into a massive black hole in a galactic center
• Kinematic Structure of the Galactic Center S-cluster
• Weighing the cusp at the Galactic Centre
• Dust Embedded Sources at the Galactic Center. 2 to 4$\mu$m imaging and spectroscopy in the central parsec
• Dusty Sources at the Galactic Center: The N- and Q-band view with VISIR
• SiO Maser Survey of the Large-Amplitude Variables in the Galactic Center
• IRS 13N: a new comoving group of sources at the Galactic Center
• Localizing Sagittarius A* and M87 on Microarcsecond Scales with Millimeter VLBI
• ALMA View of the Circum-nuclear Disk of the Galactic Center; Tidally-disrupted Molecular Clouds falling to the Galactic Center
• First NACO observations of the Brown Dwarf LHS 2397aB
• Compact Radio Sources within 30" of Sgr A*: Proper Motions, Stellar Winds and the Accretion Rate onto Sgr A*
• The Galactic Center: An Improved Astrometric Reference Frame for Stellar Orbits around the Supermassive Black Hole
• On Intrinsic Magnetic Moments In Black Hole Candidates
• Detection of the Sgr A* activity at 3.8 and 4.8 microns with NACO
• ALMA View of the Galactic Center Mini-spiral: Ionized Gas Flows around Sagittarius A*
• Limits on the Position Wander of Sgr A*
• Compact mid-IR sources east of galactic center source IRS5
• Constraining the accretion flow density profile near Sgr A* using the $L^{\prime }$-band emission of the S2 star
• The Discovery of Radio Stars within 10 arcseconds of Sgr A* at 7mm
• A Measurement of Proper Motions of SiO Maser Sources in the Galactic Center with the VLBA
• Divergences in gravitational-wave emission and absorption from extreme mass ratio binaries
• Mid-Infrared studies of dusty sources in the Galactic Center
• A Milliarcsecond-accurate Position for Sagittarius A*
• Sub-millimeter Detection of a Galactic Center Cool Star IRS 7 by ALMA
• Tidally-disrupted Molecular Clouds falling to the Galactic Center
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• Resolving Microlensing Events with Triggered VLBI
• Discriminating between different scenarios for the formation and evolution of massive black holes with LISA