Detection of faint stars near Sagittarius A* with GRAVITY

  title={Detection of faint stars near Sagittarius A* with GRAVITY},
  author={Roberto Abuter and Ant{\'o}nio Amorim and Michi Baub{\"o}ck and J. P. Berger and Henri Bonnet and Wolfgang Brandner and Yann Cl'enet and Yigit Dallilar and Richard I. Davies and P. Tim de Zeeuw and Jason Dexter and Anderson Drescher and Frank Eisenhauer and Natascha M. F{\"o}rster Schreiber 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 Th. Henning and Stephen Hippler and M. Horrobin and Alejandra Jim{\'e}nez-Rosales and L. Jochum and L. Jocou and A. Kaufer and Pierre Kervella and Sylvestre Lacour and Vincent Lapeyr{\`e}re and Jean-Baptiste Le Bouquin and Pierre L'ena and Dieter Lutz and M. Nowak and Thomas Ott and T. Paumard and K. Perraut and Guy Perrin and Oliver Pfuhl and Sebastian Rabien and Gustavo Rodr'iguez-Coira and Jinyi Shangguan and T. Taro Shimizu and Silvia Scheithauer and J. Stadler and Odele Straub and C. Straubmeier and Eckhard Sturm and Linda J. Tacconi and Frederic H. Vincent and Sebastiano D. von Fellenberg and Idel Waisberg and Felix Widmann and Ekkehard Wieprecht and Erich Wiezorrek and Julien Woillez and S. Yazici and G{\'e}rard Zins},
  journal={Astronomy \& Astrophysics},
The spin of the supermassive black hole that resides at the Galactic Center can, in principle, be measured by accurate measurements of the orbits of stars that are much closer to Sgr A* than S2, the orbit of which recently provided the measurement of the gravitational redshift and the Schwarzschild precession. The GRAVITY near-infrared interferometric instrument combining the four 8m telescopes of the VLT provides a spatial resolution of 2–4 mas, breaking the confusion barrier for adaptive… 
13 Citations

The impact of gravitational lensing in the reconstruction of stellar orbits around Sgr A*

. After the amazing discoveries by the GRAVITY collaboration in the last few years on the star S2 orbiting the black hole Sgr A* in the center of the Milky Way, we present a detailed investigation of

Observation of S4716—a Star with a 4 yr Orbit around Sgr A*

The ongoing monitoring of the Galactic center and Sgr A*, the central supermassive black hole, produces surprising and unexpected findings. This goes hand in hand with the technical evolution of

Nobel Lecture: A forty-year journey

First Sagittarius A* Event Horizon Telescope Results. VI. Testing the Black Hole Metric

Astrophysical black holes are expected to be described by the Kerr metric. This is the only stationary, vacuum, axisymmetric metric, without electromagnetic charge, that satisfies Einstein’s

Multiwavelength Variability of Sagittarius A* in 2019 July

We report a timing analysis of near-infrared (NIR), X-ray, and submillimeter data during a 3 day coordinated campaign observing Sagittarius A*. Data were collected at 4.5 μm with the Spitzer Space

Unveiling the nature of SgrA* with the geodesic motion of S-stars

Despite the huge improvements guaranteed by future GRAVITY observations of the S0-2 star, these will not be able to unveil the fundamental nature, whether black hole or wormhole, of the central

Central X-Ray Point Sources Found to Be Abundant in Low-mass, Late-type Galaxies Predicted to Contain an Intermediate-mass Black Hole

Building upon three late-type galaxies in the Virgo cluster with both a predicted black hole mass of less than ∼105 M ⊙ and a centrally located X-ray point source, we reveal 11 more such galaxies,

Unveiling the nature of SgrA* with the geodesic motion of S-stars

Despite the huge improvements guaranteed by future GRAVITY observations of the S0-2 star, these will not be able to unveil the fundamental nature, whether black hole or wormhole, of the central



The Laser Interferometer Space Antenna: Unveiling the Millihertz Gravitational Wave Sky.

The first terrestrial gravitational wave interferometers have dramatically underscored the scientific value of observing the Universe through an entirely different window, and of folding this new

The flux distribution of Sgr A*

The Galactic center black hole Sagittarius A* is a variable near-infrared (NIR) source that exhibits bright flux excursions called flares. When flux from Sgr A* is detected, the light curve has been

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

Relativistic redshift of the star S0-2 orbiting the Galactic Center supermassive black hole

A combination of special relativistic and gravitational redshift is detected, quantified using the redshift parameter ϒ, which is consistent with general relativity and excludes a Newtonian model with a statistical significance of 5σ.

First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole

We present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. These images show a prominent ring with a diameter of ∼40 μas, consistent

Probing post-newtonian physics near the galactic black hole with stellar redshift measurements

Stars very close to the massive black hole (MBH) in the center of the Galaxy allow us to probe post-Newtonian (PN) physics in a yet unexplored regime of celestial mechanics. Recent advances in

The galactic center massive black hole and nuclear star cluster

The Galactic Center is an excellent laboratory for studying phenomena and physical processes that may be occurring in many other galactic nuclei. The Center of our Milky Way is by far the closest

A geometric distance measurement to the Galactic center black hole with 0.3% uncertainty

We present a 0.16% precise and 0.27% accurate determination of R0, the distance to the Galactic center. Our measurement uses the star S2 on its 16-year orbit around the massive black hole Sgr A* that

Variability Timescale and Spectral Index of Sgr A* in the Near Infrared: Approximate Bayesian Computation Analysis of the Variability of the Closest Supermassive Black Hole

An analysis of the most comprehensive NIR variability data set of Sagittarius A* to date, which implies that the Sgr A* NIR color becomes bluer during higher flux-density phases, and a new approximate Bayesian computation method for fitting the first-order structure function extracts information beyond current fast Fourier transformation methods of power spectral density (PSD) estimation.