Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-12-08
Astrophys.J.638:L21-L24,2006
Astronomy and Astrophysics
Astrophysics
6 pages, 2 figures, submitted to ApJ Letters
Scientific paper
10.1086/500930
We consider a model in which Sgr A*, the 3.5x10^6 M_sun supermassive black hole candidate at the Galactic Center, is a compact object with a surface. Given the very low quiescent luminosity of Sgr A* in the near infrared, the existence of a hard surface, even in the limit in which the radius approaches the horizon, places severe constraints upon the steady mass accretion rate in the source, requiring dM/dt < 10^-12 M_sun/yr. This limit is well below the minimum accretion rate needed to power the observed submillimeter luminosity of Sgr A*. We thus argue that Sgr A* does not have a surface, i.e., it must have an event horizon. The argument could be made more restrictive by an order of magnitude with microarcsecond resolution imaging, e.g., with submillimeter VLBI.
Broderick Avery E.
Narayan Ramesh
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