VLBI observations of the galactic center source SGR A* at 86 GHz and 215 GHz

Details VLBI observations of the galactic center source SGR A* at 86 GHz and 215 GHz VLBI observations of the galactic center source SGR A* at 86 GHz and 215 GHz

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...335l.106k&link_type=abstract

Astronomy and Astrophysics, v.335, p.L106-L110 (1998)

Astronomy and Astrophysics

Astrophysics

73

Galaxy: Center, Galaxies: Individual: Sgr A*, Scattering, Techniques: Interferometry, Vlbi

Scientific paper

We have observed and detected Sgr A* with VLBI at 86 GHz and at 215 GHz in March 1995. At 86 GHz the measured closure phase is close to zero, consistent with a point-like or symmetric structure of 190 +/- 30 mu as in size. At 215 GHz we have detected Sgr A* with a signal-to-noise ratio of 6. This yields a tentative size estimate of 110 +/- 60 mu as which, despite of a limited calibration accuracy and uncertainty in the origin of the mm/sub-mm total flux density excess, lies well above the scattering size of 20 mu as at this frequency. The intrinsic size of Sgr A* thus appears to be 17 +/- 9 Schwarzschild radii for a 2.6 * 10^6 M_solar black hole.

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