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Advection‐dominated Accretion Model of Sagittarius A*: Evidence for a Black Hole at the Galactic Center
Sagittarius A*, which is located at the Galactic center, is a puzzling source. It has a mass of M = (2.5 ± 0.4) × 106 M☉, which makes it an excellent black hole candidate. Observations of stellar winds and other gas flows in its vicinity suggest a mass accretion rate …