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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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