VLBA Imaging of Sgr A* at 86 GHz

Details VLBA Imaging of Sgr A* at 86 GHz VLBA Imaging of Sgr A* at 86 GHz

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..340..263s&link_type=abstract

Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA, ASP Conference Proceedings, Vol. 340. Edited

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first VLBI image of Sgr A* ever made at 86 GHz. The image shows an E-W elongated elliptical Gaussian brightness distribution. By means of a model fitting procedure that makes use of the closure amplitudes, we determined the source apparent structure to be 0.21 + 0.02 - 0.01 mas by 0.13 + 0.05 - 0.13 mas with a position angle of 79° + 12° - 33°. There is a large error bar in the fitted minor axis size (mainly due to the poor spatial resolution along the N-S direction), but the major axis is determined very well. The discrepancy between the measured major axis size and that of the current scattering angle of 0.175 mas at 86 GHz implies an intrinsic size along E-W of 0.116 mas, or, 0.93 AU at a distance of 8 kpc.

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