| Merging of galaxies with central black holes I. Hierarchical mergings of equal-mass galaxies (2007) | |||||||||||||||
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| We investigated the merging of galaxies with central massive black holes. We performed simulation of hierarchical mergings, in which the merger remnant of one simulation was used as the progenitor for the next simulation. Our main results are the following. First, the central part of the merger has a very shallow density cusp (ae / r \Gammaff with ff ! ΒΈ 1). This result is in good agreement with recent HST result which suggest most of large ellipticals have shallow density cusps. This shallow cusp gives almost constant surface density. The radius of this shallow cusp (core) roughly doubles at each merging event. This expansion of the core was supported by the energy production from the black hole binary. As a result, the ratio between the core radius and the half mass radius was kept roughly constant. This result is again in good agreement with the observed positive correlation between the core radius and the effective radius of elliptical galaxies. In previous simulations of galax... | |||||||||||||||
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