News from the Dark Mass at the Center of the Milky Way

Details News from the Dark Mass at the Center of the Milky Way News from the Dark Mass at the Center of the Milky Way

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005idm..conf..171e&link_type=abstract

THE IDENTIFICATION OF DARK MATTER. Proceedings of the Fifth International Workshop. Held 6-10 September 2004 in Edinburgh, UK. E

Physics

1

Scientific paper

The Galactic Center measurements of stellar orbits and strongly variable NIR and X-ray emission from Sagittarius A* at the center of the Milky Way have provided the strongest evidence so far that the dark mass concentrations seen in many galactic nuclei are most likely super massive black holes. As proven by the Keplerian orbits of several of the high velocity stars within the central arcsecond at the position of the compact radio source SgrA* the Galactic Center harbors a ~3.5×106M&sun; massive black hole. Simultaneous NIR/X-ray observations of SgrA* in 2003/2004 have revealed first insights into the emission mechanisms of both the powerful near-infrared flares and the `quiescent' emission from within a few 10 - 100 Schwarzschild radii of the super-massive black hole at the center of the Milky Way. The central source shows synchronous NIR/X-ray flare variations and indications of quasi-periodicity within the NIR flares. In addition the detection of a stellar cusp give evidence for the presence of a spherical potential which is neither Keplerian nor harmonic. In such a potential orbits will precess resulting in rosetta shaped trajectories on the sky and the assumption of non-Keplerian orbits is a more physical approach. It is also the only approach through which cusp mass information can be obtained via stellar dynamics of the cusp members. First results of modeling such a system are now available as well.

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