Galaxies with kinematically distinct cores in Illustris

The growing amount of integral-field spectroscopic data creates an increased demand for understanding kinematic peculiarities that carry valuable information about the evolution host galaxies. For kinematically distinct cores (KDCs), a number formation mechanisms have been proposed, but it is still unclear which them commonly occur in Universe. We aim to address KDC cosmological context. used publicly available large-scale hydrodynamic simulation Illustris. identify 134 KDCs, study their properties, and follow back time. Examples four galaxies hosting KDCs are presented described detail. masses hosts general distribution Illustris galaxies, with possible slight preference towards massive can be long-lived features, epochs roughly uniformly distributed look-back times 0-11.4 Gyr, they survive even major or multiple subsequent mergers. There no single channel formation, mergers seem mechanism 60% significant percentage being higher among hosts. Other formed during pericentric passage flyby another galaxy, by precession previously rapidly rotating core, without obvious external cause. mean mass-weighted stellar age inside radius either same as time older. Although radii our on average larger than observed, we find younger ages typically associated smaller KDCs. A fraction possess shells led within last 5 double peaks velocity dispersion maps.