High-resolution Millimeter-VLBI Imaging of Sgr A*

Details High-resolution Millimeter-VLBI Imaging of Sgr A* High-resolution Millimeter-VLBI Imaging of Sgr A*

2006-11-20

arxiv.org/abs/astro-ph/0611613v1

Astronomy and Astrophysics

Astrophysics

4 pages, Contribution to the proceedings of the Galactic Center Workshop 2006 "From the Center of the Milky Way to Nearby Low-

Scientific paper

10.1088/1742-6596/54/1/059

We present the highest resolution VLBI imaging observations of Sgr A* made at both 7 and 3.5 mm. These data reveal wavelength-dependent intrinsic sizes with an intrinsic emitting region at 3.5 mm of about 1 AU (at a distance of 8 kpc to the Galactic Center). When combined with the lower limit on the mass of Sgr A*, these size measurements provide strong evidence that Sgr A* is a super-massive black hole. We also detected a structural variation which results in an intrinsically symmetrical structure that increases in its intrinsic size by more than 25% at 7 mm.

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