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Black holes and galactic density cusps I radial orbit cusps and bulges

AuthorsLe Delliou, Morgan ; Henriksen, Richard N.; Macmillan, Joseph D.
Physics gravitation
Issue Date8-Feb-2010
AbstractAims: In this paper we study density cusps made from radial orbits that may contain central black holes. The actual co-eval self-similar growth would not distinguish between the central object and the surroundings.
Methods: To study the environment of an existing black hole we seek distribution functions that may contain a black hole and that retain at least a memory of self-similarity. We refer to the environment in brief as the 'bulge' or sometimes the 'halo'. This depends on whether the black hole is a true singularity dominating its halo or rather a core mass concentration that dominates a larger bulge. The hierarchy might extend to include galactic bulge and halo.
Results: We find simple descriptions of simulated collisionless matter in the process of examining the presence of central masses. The Fridmann & Polyachenko distribution function describes co-eval growth of a bulge and black hole that might explain the observed mass correlation.
Conclusions: We derive our results from first principles assuming either self-similar virialisation or normal steady virialisation. The implied energy relaxation of the collisionless matter is due to the time dependence. Phase mixing relaxation may be enhanced by clump-clump interactions.
Description8 pages, 3 figures.-- En: Astronomy & Astrophysics manuscript no. AA_2009_13647v1 Dec. 8, 2009
Publisher version (URL)http://arxiv.org/abs/0911.2232
Appears in Collections:(IFT) Artículos
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