Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99q.134b&link_type=abstract
Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.134
Astronomy and Astrophysics
Astrophysics
Scientific paper
We use N-body simulations to study the merging of two elliptical galaxies with central supermassive black holes. The study of merging of bulges with a central point mass is of relevant astrophysical interest, since the formation of binary black holes seems to play a major role in the evolution of the properties and the structure of merged galaxies. Previous simulations (e.g. Makino 1997; Milosavlievic & Merritt 2001) have shown that the central stellar density profile, the stellar orbits, and the global structure of merging relics are strongly influenced by the presence of a black hole binary system. Our simulations have the advantage of higher resolution and more realistic galaxy models. We use two self-consistent models. The first is from Widrow & Dubinski (2005), consisting of an Hernquist profile for the stellar component (Hernquist 1990), a Navarro, Frenk, and White dark halo (Navarro, Frenk, & White 1996), and a central massive particle. We constructed a second model, consisting of a Jaffe density profile for the stellar component (Jaffe 1983), an Hernquist profile for the halo, and a central massive particle. We are studying the evolution of the binary black holes, their effects on the host galaxy, and we are examining the origin of the empirical relation between the mass of the central black hole and the galaxy central velocity dispersion (Magorrian et al. 1998; Gebhardt et al. 2000; Ferrarese & Merritt 2000). We are also investigating if this relation and the Fundamental Plane (Djorgovski & Davis 1987; Dressler et al. 1987) are preserved during mergers.
Bonoli Silvia
Dubinski John
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