A star in a 15.2-year orbit around the supermassive black hole at the centre of the Milky Way

  title={A star in a 15.2-year orbit around the supermassive black hole at the centre of the Milky Way},
  author={R. Sch{\"o}del and T. Ott and Reinhard Genzel and Reiner Hofmann and Matthew D. Lehnert and Andreas Eckart and Nelly Mouawad and Tal Alexander and Mark J. Reid and Rainer Lenzen and Markus Hartung and François Lacombe and Daniel Rouan and Eric Gendron and G'erard Rousset and Anne-Marie Lagrange and Wolfgang Brandner and Nancy Ageorges and Christopher E. Lidman and A. F. M. Moorwood and Jason Spyromilio and Norbert N. Hubin and Karl M. Menten},
Many galaxies are thought to have supermassive black holes at their centres—more than a million times the mass of the Sun. Measurements of stellar velocities and the discovery of variable X-ray emission have provided strong evidence in favour of such a black hole at the centre of the Milky Way, but have hitherto been unable to rule out conclusively the presence of alternative concentrations of mass. Here we report ten years of high-resolution astrometric imaging that allows us to trace two… Expand
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. Expand
Is there a Supermassive Black Hole at the Center of the Milky Way
This review outlines the observations that now provide an overwhelming scientific case that the center of the Milky Way harbors a supermassive black hole. Observations at infrared wavelength traceExpand
Star close to the massive black hole at center of the Milky Way
Recent measurements of stellar velocities ([5], [7]) and variable X-ray emission [3] near the center of the Milky Way have already provided the strongest case for the presence of a super-massiveExpand
Close stars and an inactive accretion disc in Sgr A* : eclipses and flares
The combination of the expected flares and eclipses offers an invaluable tool for constraining the disc density, size, plane and even direction of rotation. Expand
A Black Hole in the Galactic Center Complex IRS 13E
The IRS 13E complex is an unusual concentration of massive, early-type stars at a projected distance of ~0.13 pc from the Milky Way's central supermassive black hole Sagittarius A* (Sgr A*). BecauseExpand
Stellar Disk in the Galactic Center: A Remnant of a Dense Accretion Disk?
Observations of the Galactic center revealed a population of young massive stars within 0.4 pc from Sgr A*—the presumed location of a supermassive black hole. The origin of these stars is a puzzle asExpand
The need for a second black hole at the Galactic center
Deep infra-red observations and long-term monitoring programs have provided dynamical evidence for a supermassive black hole of mass 3 × 10 6 M⊙ associated with the radio source Sagitarrius A ∗ atExpand
The Galactic Centre star S2 as a dynamical probe for intermediate-mass black holes
We study the short-term effects of an intermediate mass black hole (IBH) on the orbit of star S2 (S02), the shortest-period star known to orbit the supermassive black hole (MBH) in the centre of theExpand
The S-star cluster at the center of the Milky Way - On the nature of diffuse NIR emission in the inner tenth of a parsec
Sagittarius A*, the super-massive black hole at the center of the Milky Way, is surrounded by a small cluster of high velocity stars, known as the S-stars. We aim to constrain the amount and natureExpand
A size of ∼1 au for the radio source Sgr A* at the centre of the Milky Way
Although it is widely accepted that most galaxies have supermassive black holes at their centres, concrete proof has proved elusive. Sagittarius A* (Sgr A*), an extremely compact radio source at theExpand


The accelerations of stars orbiting the Milky Way's central black hole
Measurements of the accelerations of three stars from the central radio source Sagittarius A* increase the inferred minimum mass density in the central region of the Galaxy by an order of magnitude relative to previous results, and localize the dark mass to within 0.05 ± 0.04 arcsec of the nominal position of Sgr A*. Expand
Over a 2 year period we have conducted a di†raction-limited imaging study at 2.2 km of the inner 6A ] 6A of the central stellar cluster of the Galaxy using the W. M. Keck 10 m telescope. The K-bandExpand
Periastron shifts of stellar orbits near the Galactic Center
The presence of a $2.9\pm0.4$ million solar mass object in the central stellar cluster of the Milky Way has recently been demonstrated via measurements of the stellar proper motions and radialExpand
Rapid X-ray flaring from the direction of the supermassive black hole at the Galactic Centre
The discovery of rapid X-ray flaring from the direction of Sagittarius A* provides compelling evidence that the emission is coming from the accretion of gas onto a supermassive black hole at the Galactic Centre. Expand
Proper Motion of the Compact, Nonthermal Radio Source in the Galactic Center, Sagittarius A*
Proper motions and radial velocities of luminous infrared stars in the Galactic center have provided strong evidence for a dark mass of 2.5 × 106 M☉ in the central 0.05 pc of the Galaxy. The leadingExpand
Observations of stellar proper motions near the Galactic Centre
EVIDENCE for a massive black hole at the centre of our Galaxy has been accumulating for the past two decades 1−7. Estimates of the mass of this region have hitherto been based on the spectroscopicExpand
The Motion of Stars near the Galactic Center: A Comparison of the Black Hole and Fermion Ball Scenarios
After a discussion of the properties of degenerate fermion balls, we analyze the orbits of the stars S0-1 and S0-2, which have the smallest projected distances to Sgr A*, in the supermassive blackExpand
The distance to the center of the Galaxy
For nearly a century astronomers have expended considerable effort to determine the size of the Milky Way. This effort is worthwhile because any change in the value of the distance from the Sun toExpand
The Proper Motion of Sagittarius A*. I. First VLBA Results
We observed Sgr A* and two extragalactic radio sources nearby in angle with the VLBA over a period of 2 yr and measured relative positions with an accuracy approaching 0.1 mas. The apparent properExpand
Inward Bound—The Search for Supermassive Black Holes in Galactic Nuclei
Dynamical searches reveal central dark objects with masses"" 106 to 109.5 M0 in the Galaxy, M31, M32, M87, NGC 3115, NGC 3377, NGC 4258, and NGC 4594. Indirect arguments suggest but do not prove thatExpand