Central Singularities and the Persistence of the Core Fundamental Plane

Details Central Singularities and the Persistence of the Core Fundamental Plane Central Singularities and the Persistence of the Core Fundamental Plane

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.8403h&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #84.03; Bulletin of the American Astronomical Society, Vol. 30, p.1378

Astronomy and Astrophysics

Astronomy

Scientific paper

In order for the core Fundamental Plane (cFP) to endure, small ellipticals must not survive mergers with giant ellipticals, despite the fact the small secondary galaxy can be as much as a million times more dense than the primary. However, we present extensive simulations which demonstrate that, for purely stellar galaxies, the secondary does in fact survive mergers with primaries up to 100 times more massive. We present experiments which indicate, though, that the addition of a massive central singularity inside the primary galaxy provides strong enough tidal forces to destroy dense cFP companions when the secondary's orbital decay is sufficiently elongated. The secondary's destruction acts to preserve the original low central density profile of the primary in the giant merger remnant. In this way, massive central black holes can be considered to 'protect' the cFP during mergers. With the increasing evidence that black holes may be omnipresent in elliptical galaxy centers, we also investigate the effect that a massive central black hole in the secondary has on the structure and energy evolution of cFP merger remnants.

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