Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-02-15
Mem.Soc.Ast.It.77:750-758,2006
Astronomy and Astrophysics
Astrophysics
9 pages. Invited contribution to "AGN and Galaxy Evolution," held in the Specola Vaticana, Castel Gandolfo, Italy, 3 - 6 Octob
Scientific paper
Supermassive black holes inhabit galactic nuclei, and their presence influences in crucial ways the evolution of the stellar distribution. The low-density cores observed in bright galaxies are probably a result of black hole infall, while steep density cusps like those at the Galactic center are a result of energy exchange between stars moving in the gravitational field of the single black hole. Loss-cone dynamics are substantially more complex in galactic nuclei than in collisionally-relaxed systems like globular clusters due to the wider variety of possible geometries and orbital populations. The rate of star-black hole interactions has begun to be constrained through observations of energetic events associated with stellar tidal disruptions.
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