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

  title={Detection of orbital motions near the last stable circular orbit of the massive black hole SgrA*},
  author={Gravity Collaboration R. Abuter and Ant{\'o}nio 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 P. Garcia and Feng 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 Thomas 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 Frederic H. Vincent and S. D. von Fellenberg and Idel Waisberg and Felix Widmann and Ekkehard Wieprecht and Erich Wiezorrek and Julien Woillez and S. Yazici},
  journal={Astronomy \& Astrophysics},
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 μas over a few tens of minutes, corresponding to about 30% the speed of light. At the same time, the… 
Modeling the orbital motion of Sgr A*’s near-infrared flares
Infrared observations of Sgr A* probe the region close to the event horizon of the black hole at the Galactic center. These observations can constrain the properties of low-luminosity accretion as
A Plasmoid model for the Sgr A* Flares Observed With Gravity and CHANDRA
The Galactic Center black hole Sgr A* shows significant variability and flares in the submillimeter, infrared, and X-ray wavelengths. Owing to its exquisite resolution in the IR bands, the GRAVITY
Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole
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
Effect of Electromagnetic Interaction on Galactic Center Flare Components
Recently, near-infrared GRAVITY@ESO observations at 2.2 μm announced the detection of three bright “flares” in the vicinity of the Galactic center supermassive black hole (SMBH) that exhibited
Flares in the Galactic Centre – I. Orbiting flux tubes in magnetically arrested black hole accretion discs
Recent observations of SgrA* by the GRAVITY instrument have astrometrically tracked infrared flares (IR) at distances of $\sim 10$ gravitational radii ($r_g$). In this paper, we study a model for the
S62 on a 9.9 yr Orbit around SgrA*
We present the Keplerian orbit of S62 around the supermassive black hole Sagittarius A* (SgrA*) in the center of our Galaxy. We monitor this S-star cluster member over more than a full orbit around
Unprecedented Near-infrared Brightness and Variability of Sgr A*
The electromagnetic counterpart to the Galactic center supermassive black hole, Sgr A*, has been observed in the near-infrared for over 20 yr and is known to be highly variable. We report new Keck
Dynamically important magnetic fields near the event horizon of Sgr A*
We study the time-variable linear polarisation of Sgr A* during a bright near-infrared flare observed with the GRAVITY instrument on July 28, 2018. Motivated by the time evolution of both the
Light curve of a hotspot on equatorial orbit around Kerr black hole surrounded by reflective firewall
Recent technological advancements in getting signatures of astrophysical events has been remarkable in the last decade. Gravitational wave observations by LIGO/VIRGO/KAGRA confirmed the primary
A parameter survey of Sgr A* radiative models from GRMHD simulations with self-consistent electron heating
The Galactic centre black hole candidate Sgr A* is the best target for studies of low-luminosity accretion physics, including with near-infrared (NIR) and submillimetre wavelength long baseline


Performance of astrometric detection of a hotspot orbiting on the innermost stable circular orbit of the galactic centre black hole
The Galactic Central black hole Sgr A* exhibits outbursts of radiation in the near-infrared (so-called IR flares). One model of these events consists in a hotspot orbiting on the innermost stable
Detection of the gravitational redshift in the orbit of the star S2 near the Galactic centre massive black hole
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
Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
Observations at a wavelength of 1.3 mm set a size of microarcseconds on the intrinsic diameter of Sagittarius A*, suggesting that the bulk of Sgr A* emission may not be centred on the black hole, but arises in the surrounding accretion flow.
General Relativistic Flux Modulations from Disk Instabilities in Sagittarius A
Near-IR and X-ray flares have been detected from the supermassive black hole Sgr A* at the center of our Galaxy with a (quasi-)period of ~17-20 minutes, suggesting an emission region only a few
Prospects for testing the nature of Sgr A*'s NIR flares on the basis of current VLT- and future VLTI-observations
Sagittarius A*, the supermassive compact object at the center of the Galaxy, exhibits outbursts in the near infrared and X-ray domains. These flares are likely due to energetic events very close to
The Post-pericenter Evolution of the Galactic Center Source G2
In early 2014, the fast-moving near-infrared source G2 reached its closest approach to the supermassive black hole Sgr A* in the Galactic center. We report on the evolution of the ionized gaseous
Imaging bright-spots in the accretion flow near the black hole horizon of Sgr A*
Images from the vicinity of the black hole horizon at the Galactic centre (Sgr A*) could be obtained in the near future with a Very Large Baseline Array of submillimetre telescopes. The recently
A gas cloud on its way towards the supermassive black hole at the Galactic Centre
The presence of a dense gas cloud approximately three times the mass of Earth that is falling into the accretion zone of Sagittarius A*, a compact radio source at the Galactic Centre, is reported.
Pinpointing the near-infrared location of Sgr A* by correcting optical distortion in the NACO imager
Near-infrared observations of stellar orbits at the Galactic Center provide conclusive evidence for a massive black hole associated with the compact radio source Sgr A*. The astrometric reference
Polarimetric Imaging of the Massive Black Hole at the Galactic Center
The radio source Sagittarius A* in the Galactic center emits a polarized spectrum at millimeter and submillimeter wavelengths that is strongly suggestive of relativistic disk accretion onto a massive