The GC stellar cluster: The central arcsecond

Rainer Schödel1, Andreas Eckart2, Reinhard Genzel1, Nelly Mouawad2, Thomas Ott1

1 Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany
2 I.Physikalisches Institut, Universität zu Köln, Zülpicher Straß e 77, 50937 Köln, Germany

E-mail contact: rainer@mpe.mpg.de

We outline the evolution of the central 1 x 1" of the SgrA* stellar cluster, based on ten years of near-infrared high resolution speckle and adaptive optics imaging. By combining high quality maps produced from a painstaking selection and careful deconvolution of the best SHARP/NTT imaging data (1992-2002) with Gemini science verification (2000) and CONICA/NAOS/VLT commissioning/science verification data (2002), we obtain proper motions for 25 stars at K16, with 4 sources moving at velocities 1000km/s. Implications of the new proper motion data are discussed. Our data on stellar dynamics in the central stellar cluster provide compelling evidence for the presence of a supermassive black hole at the location of SgrA*. We present NIR K- and H-Band high resolution (FWHM 60 mas) CONICA/NAOS/VLT adaptive optics imaging observations of the central 1 x 1". These new data are 2-3 magnitudes deeper than earlier observations, promising significant progress on the observation of stellar dynamics in the immediate vicinity of the supermassive black hole over the next years.