VLBI Observations of the Galactic Center Source Sgr A* at 86 GHz and 215 GHz
| dc.creator | Krichbaum, T. P. | |
| dc.creator | Witzel, A. | |
| dc.creator | Zensus, J. A. | |
| dc.date | 1998-12-02 | |
| dc.date.accessioned | 2026-07-25T13:25:15Z | |
| dc.description | We summarize previous VLBI observations of Sgr A* at millimeter wavelengths and present new results from VLBI observations at 86 and at 215 GHz. At 86 GHz the measured closure phase is close to zero, consistent with a point-like or symmetric structure of 190 +/- 30 micro-arcsec size. At 215 GHz we have detected Sgr A* with a signal-to-noise ratio of 6. This yields a tentative size estimate of 50 < theta < 190 micro-arcsec, which is larger than the scattering size of 20 micro-arcsec at this frequency. The intrinsic size of Sgr A* thus appears to be a few up to a few ten Schwarzschild radii. | |
| dc.description | 9 pages, 4 figures, (PASP)Latex, to appear in: Proceedings of an International Workshop on the Galactic Center, held in Tucson, Arizona, September 7-11, 1998: `The Central Parsec of the Galaxy', eds. H. Falcke, A. Cotera, W. Duschl, F. Melia, and M. Riecke, ASP Conference Series | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9812050 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9812050 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/17135 | |
| dc.subject | Astrophysics | |
| dc.title | VLBI Observations of the Galactic Center Source Sgr A* at 86 GHz and 215 GHz | |
| dc.type | text |