SIMBAD references

2015MNRAS.453.3234P - Mon. Not. R. Astron. Soc., 453, 3234-3244 (2015/November-1)

Pinpointing the near-infrared location of Sgr A* by correcting optical distortion in the NACO imager.

PLEWA P.M., GILLESSEN S., EISENHAUER F., OTT T., PFUHL O., GEORGE E., DEXTER J., HABIBI M., GENZEL R., REID M.J. and MENTEN K.M.

Abstract (from CDS):

Near-infrared observations of stellar orbits at the Galactic Center provide conclusive evidence for a massive black hole associated with the compact radio source Sgr A*. The astrometric reference frame for these observations is tied to a set of red giant stars, which are also detectable at radio wavelengths through SiO maser emission in their envelopes. We have improved the precision and long-term stability of this reference frame, in which Sgr A* is localized to within a factor 5 better than previously: ∼ 0.17mas in position (in 2009) and ∼ 0.07mas/yr in velocity. This improvement is the result of modelling and correcting optical distortion in the VLT/NACO imager to a submas level and including new infrared and radio measurements, which now both span more than a decade in time. A further improvement will follow future observations and facilitate the detection of relativistic orbital effects.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): methods: data analysis - techniques: high angular resolution - astrometry - Galaxy: centre - infrared: stars

CDS comments: Star SiO 15 is not identified.

Simbad objects: 14

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2020.01.19-18:27:27

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