Structure of SGR A* from 3mmλ-VLBI

Details Structure of SGR A* from 3mmλ-VLBI Structure of SGR A* from 3mmλ-VLBI

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aspc..186...98d&link_type=abstract

The Central Parsecs of the Galaxy, ASP Conference Series, Vol. 186. Edited by Heino Falcke, Angela Cotera, Wolfgang J. Duschl, F

Physics

6

Scientific paper

We report on 3mmλ-VLBI observations of Sgr A* with an array of three antennas. A brief discussion of calibration precedes our results as it is the most important problem to overcome in high frequency continuum VLBI measurements. Our size estimates of Sgr A* are consistent with past results but cannot improve on them. However, calculation of the closure phase (sum of interferometric phases around a triplet of antennas) does yield direct information on the possible asymmetry of Sgr A*. In our observations we find the closure phase to be consistent with zero which restricts to some extent the type and degree of asymmetry that Sgr A* can exhibit.

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