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We present Ha integral field spectroscopy of well resolved, UV/opticallyselected z~2 star-forming galaxies as part of the SINS survey with SINFONI onthe ESO VLT. Our laser guide star adaptive optics and good seeing data show thepresence of turbulent rotating star forming rings/disks, plus centralbulge/inner disk components, whose mass fractions relative to total dynamicalmass appears to scale with [NII]/Ha flux ratio and star formation age. Wepropose that the buildup of the central disks and bulges of massive galaxies atz~2 can be driven by the early secular evolution of gas-rich proto-disks. Highredshift disks exhibit large random motions. This turbulence may in part bestirred up by the release of gravitational energy in the rapid cold accretionflows along the filaments of the cosmic web. As a result dynamical friction andviscous processes proceed on a time scale of <1 Gyr, at least an order ofmagnitude faster than in z~0 disk galaxies. Early secular evolution thus drivesgas and stars into the central regions and can build up exponential disks andmassive bulges, even without major mergers. Secular evolution along withincreased efficiency of star formation at high surface densities may also helpto account for the short time scales of the stellar buildup observed in massivegalaxies at z~2.

From rings to bulges: evidence for rapid secular galaxy evolution at z~2 from integral field spectroscopy in the SINS survey