High-resolution Millimeter-VLBI Study of Sgr A* -- A Supermassive Black Hole at the Galactic Center

Details High-resolution Millimeter-VLBI Study of Sgr A* -- A Supermassive Black Hole at the Galactic Center High-resolution Millimeter-VLBI Study of Sgr A* -- A Supermassive Black Hole at the Galactic Center

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..373...37s&link_type=abstract

The Central Engine of Active Galactic Nuclei, ASP Conference Series, Vol. 373, proceedings of the conference held 16-21 October,

Physics

Scientific paper

We report on the millimeter-VLBI study of Sgr A*, which has revealed a wavelength-dependent (λ^β with β=1.09+0.34-0.32) intrinsic size with an intrinsic emitting region at 3.5 mm of 1 AU in diameter. When combined with the lower limit on the mass of Sgr A*, these size measurements provide strong evidence for Sgr A* being a supermassive black hole. We also detected a structural variation at 7 mm that results in an increase in the intrinsic size.

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