VLBA image of SGR A at lambda = 1.35 cm.

The compact non-thermal radio source at the Galactic Center, Sgr A^*, has been imaged, at λ=1.35 cm, for the first time with VLBI techniques. We observed Sgr A^*, on 1991 June 23, with an array formed by 5 of the VLBA telescopes and the phased-VLA. The maximum angular resolution corresponded to a fringe spacing of 6.0×2.8 milliarcseconds in position angle 3° (measured east from north). The observed surface brightness distribution of Sgr A^* is best modelled by an elliptically shaped gaussian component with parameter values: flux density = 1.07±0.15 Jy, major axis of FWHM =2.58±0.08 milliarcseconds in position angle = 790±6°, and axial ratio =0.5±0.2. The angular size of this model agrees well with the expected scattering size of Sgr A^*. There is no clear evidence of any change in the source structure between our two sets of λ=1.35 cm VLBI observations on Sgr A^* which were separated by 6 years.