Galaxy Cores as Relics of Black Hole Mergers

Details Galaxy Cores as Relics of Black Hole Mergers Galaxy Cores as Relics of Black Hole Mergers

2001-10-08

arxiv.org/abs/astro-ph/0110185v3

Mon.Not.Roy.Astron.Soc. 331 (2002) L51

Astronomy and Astrophysics

Astrophysics

5 pages, 2 postscript figures, uses emulateapj.sty. Accepted for publication in Monthly Notices of the Royal Astronomical Soci

Scientific paper

10.1046/j.1365-8711.2002.05436.x

We investigate the hypothesis that the cores of elliptical galaxies and bulges are created from the binding energy liberated by the coalescence of supermassive binary black holes during galaxy mergers. Assuming that the central density profiles of galaxies were initially steep power laws, we define the ``mass deficit'' as the mass in stars that had to be removed from the nucleus in order to produce the observed core. We use nonparametric deprojection to compute the mass deficit in a sample of 35 early-type galaxies with high-resolution imaging data. We find that the mass deficit correlates well with the mass of the nuclear black hole, consistent with the predictions of merger models. We argue that core sizes in halos of non-interacting dark matter particles should be comparable to those observed in the stars.

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