Detection of the gravitational redshift in the orbit of the star S2 near the Galactic centre massive black hole

  title={Detection of the gravitational redshift in the orbit of the star S2 near the Galactic centre massive black hole},
  author={Gravity Collaboration R. Abuter and Ant{\'o}nio Amorim and N. Anugu and Michi Baubock and Myriam Benisty and J. P. Berger and Nicolas Blind and Henri Bonnet and Wolfgang Brandner and Alexander Buron and Claude Collin and Fr{\'e}d{\'e}ric Chapron and Yann Cl'enet and Vincent Coud'e du Foresto and P. T. de Zeeuw and Casey Deen and Franccoise Delplancke-Strobele and Roderick Dembet and Jason Dexter and G. Duvert and Andreas Eckart and Frank Eisenhauer and Gert Finger and Natascha M. Forster Schreiber and Pierre F'edou and P. Garcia and Ram{\'o}n J. Garc{\'i}a L{\'o}pez and Feng Gao and Eric Gendron and Reinhard Genzel and Stefan Gillessen and Paulo Gordo and Maryam Habibi and X. Haubois and Marcus Haug and Frank Haussmann and Th. Henning and Stephen Hippler and M. Horrobin and Zolt{\'a}n Hubert and Norbert N. Hubin and A. Jim{\'e}nez Rosales and L. Jochum and L. Jocou and A. Kaufer and Stefan Kellner and Sarah Kendrew and Pierre Kervella and Yitping Kok and Martin Kulas and Sylvestre Lacour and Vincent Lapeyr{\`e}re and Bernard Lazareff and J.-B. Le Bouquin and Pierre L'ena and Magdalena Lippa and Rainer Lenzen and Antoine M'erand and E. Muller and Udo Neumann and Thomas Ott and L. Palanca and T. Paumard and Luca Pasquini and K. Perraut and Guy Perrin and Oliver Pfuhl and Philipp M. Plewa and Sebastian Rabien and A. Ram'irez and Jos{\'e} Ricardo Ramos and Christian Rau and Gustavo Rodr'iguez-Coira and R. R. Rohloff and G'erard Rousset and Joel Sanchez-Bermudez and Silvia Scheithauer and Markus Scholler and N. Schuler and Jason Spyromilio and Odele Straub and C. Straubmeier and Eckhard Sturm and Linda J. Tacconi and Konrad R. W. Tristram and Frederic H. Vincent and S. D. von Fellenberg and Imke Wank and Idel Waisberg and Felix Widmann and Ekkehard Wieprecht and Michael Wiest and Erich Wiezorrek and Julien Woillez and S. Yazici and Denis Ziegler and G{\'e}rard Zins},
  journal={Astronomy \& Astrophysics},
The highly elliptical, 16-year-period orbit of the star S2 around the massive black hole candidate Sgr A✻ is a sensitive probe of the gravitational field in the Galactic centre. Near pericentre at 120 AU ≈ 1400 Schwarzschild radii, the star has an orbital speed of ≈7650 km s−1, such that the first-order effects of Special and General Relativity have now become detectable with current capabilities. Over the past 26 years, we have monitored the radial velocity and motion on the sky of S2, mainly… 

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