Single and Binary Black Holes and their Influence on Nuclear Structure

Details Single and Binary Black Holes and their Influence on Nuclear Structure Single and Binary Black Holes and their Influence on Nuclear Structure

2003-01-14

arxiv.org/abs/astro-ph/0301257v1

Astronomy and Astrophysics

Astrophysics

10 pages, 4 figures, uses emulateapj.sty, onecolfloat.sty. An abridged version of this article will appear in Carnegie Observa

Scientific paper

Massive central objects affect both the structure and evolution of galactic nuclei. Adiabatic growth of black holes generates power-law central density profiles with logarithmic slopes in the range from ~1.5 to ~2.5, in good agreement with the profiles observed in the nuclei of galaxies fainter than visual magnitude -20. However the shallow nuclear profiles of bright galaxies require a different explanation. Binary black holes are an inevitable result of galactic mergers, and the ejection of stars by a massive binary displaces a mass of order the binary's own mass, creating a core or shallow power-law cusp. This model is at least crudely consistent with core sizes in bright galaxies. Uncertainties remain about the effectiveness of stellar- and gas-dynamical processes at inducing coalescence of binary black holes, and uncoalesced binaries may be common in low-density nuclei.

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