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Mass distribution in the Galactic Center based on interferometric astrometry of multiple stellar orbits / GRAVITY Collaboration
The stars orbiting the compact radio source Sgr A* in the Galactic Centre are precision probes of the gravitational field around the closest massive black hole. In addition to adaptive optics assisted astrometry (with NACO / VLT) and spectroscopy (with SINFONI / VLT, NIRC2 / Keck and GNIRS / Gemini) over three decades, since 2016/2017 we have obtained 30-100 mu-as astrometry with the four-telescope interferometric beam combiner GRAVITY / VLTI reaching a sensitivity of mK = 20 when combining data from one night. [...]
arXiv:2112.07478.- 2022-01-01 - 17 p. - Published in : Astron. Astrophys. 657 (2022) L12 Fulltext: 2112.07478 - PDF; document - PDF;

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Deep images of the Galactic center with GRAVITY / GRAVITY Collaboration
Stellar orbits at the Galactic Center provide a very clean probe of the gravitational potential of the supermassive black hole. They can be studied with unique precision, beyond the confusion limit of a single telescope, with the near-infrared interferometer GRAVITY. [...]
arXiv:2112.07477.- 2022-01-01 - 24 p. - Published in : Astron. Astrophys. 657 (2022) A82 Fulltext: PDF;

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Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole / GRAVITY Collaboration
The star S2 orbiting the compact radio source Sgr A* is a precision probe of the gravitational field around the closest massive black hole (candidate). Over the last 2.7 decades we have monitored the star's radial velocity and motion on the sky, mainly with the SINFONI and NACO adaptive optics (AO) instruments on the ESO VLT, and since 2017, with the four-telescope interferometric beam combiner instrument GRAVITY. [...]
arXiv:2004.07187.- 2020-04-01 - 14 p. - Published in : Astron. Astrophys. 636 (2020) L5 Fulltext: 2004.07187 - PDF; fulltext1791318 - PDF; Fulltext from publisher: PDF;

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25	Abuter, R
4	Abuter, Roberto

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