Galactic cannibalism in the galaxy cluster C0337-2522 at z=0.59

Details Galactic cannibalism in the galaxy cluster C0337-2522 at z=0.59 Galactic cannibalism in the galaxy cluster C0337-2522 at z=0.59

2003-06-04

arxiv.org/abs/astro-ph/0306082v1

Mon.Not.Roy.Astron.Soc. 344 (2003) 748

Astronomy and Astrophysics

Astrophysics

30 pages, 7 figures, MNRAS (accepted)

Scientific paper

10.1046/j.1365-8711.2003.06866.x

According to the galactic cannibalism model, cD galaxies are formed in the center of galaxy clusters by merging of massive galaxies and accretion of smaller stellar systems: however, observational examples of the initial phases of this process are lacking. We have identified a strong candidate for this early stage of cD galaxy formation: a group of five elliptical galaxies in the core of the X-ray cluster C0337-2522 at redshift z=0.59. With the aid of numerical simulations, in which the galaxies are represented by N-body systems, we study their dynamical evolution up to z=0; the cluster dark matter distribution is also described as a N-body system. We find that a multiple merging event in the considered group of galaxies will take place before z=0 and that the merger remnant preserves the Fundamental Plane and the Faber-Jackson relations, while its behavior with respect to the Mbh-sigma relation is quite sensitive to the details of black hole merging [abridged].

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