Relativistic Signatures at the Galactic Center
  Studies of the inner few parsecs at the Galactic Centre provide evidence of a supermassive black hole, associated with the unusual, variable radio and infrared source Sgr A*.   Our major aim is the study and analysis of the physical processes responsible for the variable emission from the compact radio source Sgr A*. In order to understand the physics behind the observed variability, we model the time evolution of the flare emitting region by studying light curves and spectra of emission originating at the surface of the accretion disk, close to the event horizon, near the marginally stable orbit of a rotating black hole.   Here we discuss the methods used in the analysis of the time-variable spectral features and subsequently present preliminary modeling results. 
E. M. Howard
astro-ph.HE