Detection of orbital motions near the last stable circular orbit of the massive black hole SgrA

@article{Abuter2018DetectionOO,
  title={Detection of orbital motions near the last stable circular orbit of the massive black hole SgrA},
  author={Gravity Collaboration R. Abuter and Ant'onio Amorim and Michi Baubock and J. P. Berger and Henri Bonnet and Wolfgang Brandner and Yann Cl'enet and Vincent Coud'e du Foresto and P. T. de Zeeuw and Casey Deen and Jason Dexter and G. Duvert and Andreas Eckart and Frank Eisenhauer and Natascha M. Forster Schreiber and Paolo J. V. Garcia and F. Gao and Eric Gendron and Reinhard Genzel and Stefan Gillessen and Patricia Guajardo and Maryam Habibi and X. Haubois and Th. Henning and Stephen Hippler and M. Horrobin and Armin Huber and Alejandra Jim'enez-Rosales and L. Jocou and Pierre Kervella and Sylvestre Lacour and Vincent Lapeyr{\`e}re and Bernard Lazareff and J.-B. Le Bouquin and Pierre L'ena and Magdalena Lippa and T. Ott and Johana Panduro and T. Paumard and K. Perraut and Guy Perrin and Oliver Pfuhl and Philipp M. Plewa and Sebastian Rabien and Gustavo Rodr'iguez-Coira and G'erard Rousset and Amiel Sternberg and Odele Straub and C. Straubmeier and Eckhard Sturm and Linda J. Tacconi and F. Vincent and S. D. von Fellenberg and I. Waisberg and Felix Widmann and Ekkehard Wieprecht and Erich Wiezorrek and Julien Woillez and S. Yazici},
  journal={arXiv: Astrophysics of Galaxies},
  year={2018}
}
We report the detection of continuous positional and polarization changes of the compact source SgrA* in high states ('flares') of its variable near- infrared emission with the near-infrared GRAVITY-Very Large Telescope Interferometer (VLTI) beam-combining instrument. In three prominent bright flares, the position centroids exhibit clockwise looped motion on the sky, on scales of typically 150 micro-arcseconds over a few tens of minutes, corresponding to about 30% the speed of light. At the… Expand
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