Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...612..593c&link_type=abstract
The Astrophysical Journal, Volume 612, Issue 2, pp. 593-596.
Astronomy and Astrophysics
Astronomy
3
Galaxies: Elliptical And Lenticular, Cd, Galaxies: Formation, Galaxies: Nuclei
Scientific paper
We have carried out a set of N-body simulations to investigate the formation of cuspy density profiles through collapses starting from cold initial conditions around a preexisting supermassive central black hole. It is found that a cold collapse leads to an inner power-law profile ρ-γ, with 0.2<~γ<~2 depending on the mass of the central black hole as well as on the slope of the initial density profile ρ-γ0 (0<=γ0<=3/2). The upper limit obtained for γ corresponds to the more massive black hole and to the steeper initial profile with γ0=3/2. Models without a central black hole form a core rather than a cusp. Also, our numerical simulations with a virial ratio of η=0.05 do not show compelling evidence that a radial anisotropy in the initial velocity distribution would play an important role in the formation of steeper cusps, as was suggested by previous authors.
Cruz Fidel
Velazquez Hector
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