High-Resolution Millimeter-VLBI Imaging of Sgr A*

2006/11/20 by Zhi-Qiang Shen · 1 citation
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Galactic Center #Galaxy #Geology #High resolution #Millimeter #Optics #Physics #Pulsars and Gravitational Waves Research #Remote sensing #Resolution (logic) #Very-long-baseline interferometry #Wavelength #astro-ph

paper · pdf · doi:10.1088/1742-6596/54/1/059

4 pages, Contribution to the proceedings of the Galactic Center Workshop 2006 "From the Center of the Milky Way to Nearby Low-Luminosity Galactic Nuclei", held in Bad Honnef, Germany on April 18 - 22, 2006. Editors: R. Schoedel (University of Cologne), et al.. To be published in the Journal of Physics: Conference Series by Institute of Physics Publishing

arxiv created 2006/11/20 · openalex publication_date 2006/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

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 kc 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.

Citations

• Structure of Sagittarius A* at 86 GH[CLC]z[/CLC] using VLBI Closure Quantities
• The Proper Motion of Sagittarius A*. II. The Mass of Sagittarius A*
• Intraday Variation of Sagittarius A* at Short Millimeter Wavelengths
• A size of ∼1 au for the radio source Sgr A* at the centre of the Milky Way
• Viewing the Shadow of the Black Hole at the Galactic Center

Cited by

• THE CIRCULAR POLARIZATION OF SAGITTARIUS A* AT SUBMILLIMETER WAVELENGTHS