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An important open question is the relation between intracluster light and thehalos of central galaxies in galaxy clusters. Here we report results from an ongoing project with the aim to characterize the dynamical state in the core ofthe Hydra I (Abell 1060) cluster around NGC 3311. Methods: We analyze deeplong-slit absorption line spectra reaching out to ~25 kpc in the halo of NGC3311. Results: We find a very steep increase in the velocity dispersion profilefrom a central sigma_0=150 km/s to sigma_out ~450 km/s at R ~ 12 kpc. Fartherout, to ~25 kpc, sigma appears to be constant at this value, which is ~60% ofthe velocity dispersion of the Hydra I galaxies. With its dynamically hot halokinematics, NGC 3311 is unlike other normal early-type galaxies. Conclusions:These results and the large amount of dark matter inferred from X-rays aroundNGC 3311 suggest that the stellar halo of this galaxy is dominated by thecentral intracluster stars of the cluster, and that the transition frompredominantly galaxy-bound stars to cluster stars occurs in the radial range 4to 12 kpc from the center of NGC 3311. We comment on the wide range of halokinematics observed in cluster central galaxies, depending on the evolutionarystate of their host clusters.

The dynamically hot stellar halo around NGC 3311: a small cluster-dominated central galaxy