Observations of stellar proper motions near the Galactic Centre

@article{Eckart1996ObservationsOS,
  title={Observations of stellar proper motions near the Galactic Centre},
  author={Andreas Eckart and Reinhard Genzel},
  journal={Nature},
  year={1996},
  volume={383},
  pages={415-417}
}
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 spectroscopic determination of radial velocities for stars and gas near the Galactic Centre, combined with the assumption that the stars are moving on largely circular, isotropically distributed orbits. But if this assumption is incorrect, the observations can be explained with a much smaller central mass, perhaps… 

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References

SHOWING 1-10 OF 23 REFERENCES

Evidence for a black hole from high rotation velocities in a sub-parsec region of NGC4258

MANY galaxies are thought to contain massive black holes— exceeding ten million solar masses—at their centres1,2, but firm observational evidence has proved to be surprisingly elusive. The best

Stellar velocities and the mass distribution in the galactic center

Radial velocities have been measured for 43 stars within 6.5 pc of the Galactic center. The stellar velocity dispersion of 75 km/s is virtually independent of radius from 0.36 pc to 6 pc, indicating

Forbidden Ne II observations of the galactic center - Evidence for a massive black hole

The velocity field within two pc of the galactic center has been investigated by observing the forbidden Ne II 12.8 micron fine-structure emission from Sgr West. The velocity variation indicates that

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 to

Collimation of astrophysical jets by inertial confinement

IT has been known for almost two decades that there is a compact, nonthermal radio source within one arcsecond of the dynamical/ gravitational centre of our Galaxy1,2. This source, designated SgrA*,

The neutral-gas disk around the galactic center

The mapping of far-infrared C(+) and O(0) fine-structure lines and the first detection of far-infrared CO and OH rotational line emission and OH absorption toward the Galactic center are reported.

Observations of the motion and distribution of the ionized gas in the central parsec of the galaxy. II

Observations of infrared fine-structure line emission from compact clouds of ionized gas within Sgr A West are presented. These clouds have diameters of 0.1--0.5 pc, internal velocity dispersions

OH/IR stars close to the Galactic Centre. II - Their spatial and kinematic properties and the mass distribution within 5-100 PC from the galactic centre

An analysis of a sample of OH/IR stars close to the Galactic Centre (GC) is presented. It is shown that the dispersion in radial velocity and the dispersion in galactic latitude both are correlated

The Nuclear Cluster of the Milky Way: Star Formation and Velocity Dispersion in the Central 0.5 Parsec

We report the first results of an extensive new study of the Galactic center stellar cluster. The central parsec is powered by a cluster of about two dozen luminous and helium-rich blue

Subarcsecond resolution observations of the central parsec of the Galaxy at 2.2 microns

Four separate lunar occultations of the Galactic center in the infrared K-band have been observed, and the results are used to estimate the size of the sources and to derive photometry. It is found