Other
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1053...71g&link_type=abstract
OBSERVATIONAL EVIDENCE FOR BLACK HOLES IN THE UNIVERSE: Proceedings of the 2nd Kolkata Conference on Observational Evidence for
Other
Galactic Center, Bar, Circumnuclear Matter, And Bulge, Gravitational Radiation, Magnetic Fields, And Other Observations, Globular Clusters In The Milky Way
Scientific paper
Since the discovery of the non-thermal, compact radio source Sgr A* it has been suspected that the center of the Milky Way harbors a massive black hole. A breakthrough in measuring the associated mass became possible with the advance of infrared astronomy. Within a decade the observations have progressed from velocity dispersion arguments to tracking individual stars as test particles for the gravitational potential. Technically this was possible due to high-angular resolution techniques, in particular adaptive optics, at a very large telescope. The observations revealed a star that moves apparently on a Keplerian orbit with a period of 15 years, allowing to measure the mass with unprecedented accuracy. Today, the 4 million solar masses black hole in the Galactic Center is the best case for the existence of an astrophysical black hole in general. For more than ten stars orbits have been determined and further progress can be expected-both from the ever growing time base as well as from future techniques such as near-infrared interferometry.
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