Mass distribution in the Galactic Center based on interferometric astrometry of multiple stellar orbits

@article{Abuter2021MassDI,
  title={Mass distribution in the Galactic Center based on interferometric astrometry of multiple stellar orbits},
  author={Gravity Collaboration R. Abuter and N. Aimar and Ant{\'o}nio Amorim and J. Ball and Michi Baubock and J. P. Berger and Henri Bonnet and Guillaume Bourdarot and Wolfgang Brandner and Vitor Cardoso and Y. Cl'enet and Yigit Dallilar and Robert D. Davies and P. T. de Zeeuw and Jason Dexter and A. Drescher and Frank Eisenhauer and N. M. Forster Schreiber and Arianna Foschi and P. Garcia and Feng Gao and Eric Gendron and Reinhard Genzel and Stefan Gillessen and Maryam Habibi and X. Haubois and Gernot Hei{\ss}el and T. Henning and Stephen Hippler and M. Horrobin and L. Jochum and L. Jocou and A. Kaufer and Pierre Kervella and Sylvestre Lacour and Vincent Lapeyr{\`e}re and J.-B. Le Bouquin and P. L'ena and Dieter Lutz and Thomas Ott and T. Paumard and K. Perraut and Guy Perrin and Oliver Pfuhl and Sebastian Rabien and Jinyi Shangguan and T. Taro Shimizu and S. Scheithauer and J. Stadler and Andrew W. Stephens and Odele Straub and C. Straubmeier and Eckhard Sturm and L. J. Tacconi and Konrad R. W. Tristram and F. H. Vincent and S. D. von Fellenberg and Felix Widmann and Ekkehard Wieprecht and Erich Wiezorrek and Julien Woillez and S. Yazici and Andr{\'e} Young and G{\'e}rard Zins},
  journal={Astronomy \& Astrophysics},
  year={2021}
}
Stars orbiting the compact radio source Sgr A* in the Galactic Center serve as 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, we have obtained 30-100 μas astrometry since 2017 with the four-telescope interferometric beam combiner GRAVITY / VLTI, capable of reaching a sensitivity of mK = 20 when… 
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