Name    E_mail_Address  Scientific_Session      Contribution_type       Title   Authors_affiliations    Abstract
abstract        Kisselev Alexej A.      Shakht@gao.spb.ru       EAS Symp.6:Dynamics of Galaxies and Galactic Nuclei.    poster  Determination of the Physical Parameters of the Supermassive Black Hole at the Center of our Galaxy     A.A.Kisselev, Yu.N.Gnedin, E.A.Grosheva, N.A.Shakht, D.L.Gorshanov, M.Yu.Piotrovich / Central (Pulkovo) Astronomical observatory of RAS, St-Petersburg, Russia  The mass of the supermassive black hole (SMBH) at the center of our Galaxy was
estimated using astrophysical methods, based on the empirical relation between the
masses of black holes in the centers of galaxies and radio and X-ray luminosities of
these regions. Also we had used two astrometric methods developed at Pulkovo
observatory to derive the orbital elements of the star S2 rotated around the galactic
center and thereby the mass of the black hole. It is shown that of our AMP (Apparent
Motion Parameters) method, based on measurements of short orbital arc and
observational data of radial velocity, has good efficiency. We estimated also the
magnetic field magnitude near the event horizon of the supermassive black hole in the
Galactic Center using the model of synchrotron emission with self-absorption. We
have also estimated an angular momentum of the black hole. This estimate suggests,
that the SMBH at the Galactic Center is a Schwarzschild than Kerr black hole, since
we estimate the Kerr parameter to be $a/M ~0.01$ (in units with $G = c = 1$).^M