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Relaxed, massive galactic objects have been identified at redshifts z = 4;5;and 6 in hydrodynamical simulations run in a large cosmological volume. Thisallowed us to analyze the assembly patterns of the high mass end of the galaxydistribution at these high zs, by focusing on their structural and dynamicalproperties. Our simulations indicate that massive objects at high redshiftalready follow certain scaling relations. These relations define virial planesat the halo scale, whereas at the galactic scale they define intrinsicdynamical planes that are, however, tilted relative to the virial plane.Therefore, we predict that massive galaxies must lie on fundamental planes fromtheir formation.  We briefly discuss the physical origin of the tilt in terms the physicalprocesses underlying massive galaxy formation at high z, in the context of atwo-phase galaxy formation scenario. Specifically, we have found that it lieson the different behavior of the gravitationally heated gas as compared withcold gas previously involved in caustic formation, and the mass dependence ofthe energy available to heat the gas.

Massive Galaxies at High-z: Assembly Patterns, Structure & Dynamics in the Fast Phase of Galaxy Formation