VLBA Image of Sagittarius-A* at λ=1.35-Centimeters

Details VLBA Image of Sagittarius-A* at λ=1.35-Centimeters VLBA Image of Sagittarius-A* at λ=1.35-Centimeters

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277l...1a&link_type=abstract

Astronomy and Astrophysics, Vol. 277, NO. 1/SEP(III), P. L1, 1993

Astronomy and Astrophysics

Astrophysics

17

Radio Sources: Sgr A* - The Galactic Center - Interferometry: Vlbi

Scientific paper

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.

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