Is there a Supermassive Black Hole at the Center of the Milky Way?

Details Is there a Supermassive Black Hole at the Center of the Milky Way? Is there a Supermassive Black Hole at the Center of the Milky Way?

2008-08-19

arxiv.org/abs/0808.2624v1

Int.J.Mod.Phys.D18:889-910,2009

Astronomy and Astrophysics

Astrophysics

Invited review submitted to International Journal of Modern Physics D; 23 pages; 10 figures

Scientific paper

10.1142/S0218271809014820

This review outlines the observations that now provide an overwhelming scientific case that the center of our Milky Way Galaxy harbors a supermassive black hole. Observations at infrared wavelength trace stars that orbit about a common focal position and require a central mass (M) of 4 million solar masses within a radius of 100 Astronomical Units. Orbital speeds have been observed to exceed 5,000 km/s. At the focal position there is an extremely compact radio source (Sgr A*), whose apparent size is near the Schwarzschild radius (2GM/c^2). This radio source is motionless at the ~1 km/s level at the dynamical center of the Galaxy. The mass density required by these observations is now approaching the ultimate limit of a supermassive black hole within the last stable orbit for matter near the event horizon.

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