Supermassive Black Hole Binaries as Galactic Blenders

Details Supermassive Black Hole Binaries as Galactic Blenders Supermassive Black Hole Binaries as Galactic Blenders

2003-03-07

arxiv.org/abs/astro-ph/0303173v2

Astrophys.J. 597 (2003) 111-130

Astronomy and Astrophysics

Astrophysics

14 pages plus 15 figures, revised and condensed version to appear in Astrophysical Journal

Scientific paper

10.1086/378287

This paper focuses on the dynamical implications of close supermassive black hole binaries both as an example of resonant phase mixing and as a potential explanation of inversions and other anomalous features observed in the luminosity profiles of some elliptical galaxies. The presence of a binary comprised of black holes executing nearly periodic orbits leads to the possibility of a broad resonant coupling between the black holes and various stars in the galaxy. This can result in efficient chaotic phase mixing and, in many cases, systematic increases in the energies of stars and their consequent transport towards larger radii. Allowing for the presence of a supermassive black hole binary with plausible parameter values near the center of a spherical, or nearly spherical, galaxy characterised initially by a Nuker density profile enables one to reproduce in considerable detail the central surface brightness distributions of such galaxies as NGC 3706.

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