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We present images taken using the Gemini South Adaptive Optics Imager (GSAOI)with the Gemini Multiconjugate Adaptive Optics System (GeMS) in three 2arcmin$^2$ fields in the Spitzer Extragalactic Representative Volume Survey.These GeMS/GSAOI observations are among the first $\approx 0.1^{''}$ resolutiondata in the near-infrared spanning extragalactic fields exceeding$1.5^{\prime}$ in size. We use these data to estimate galaxy sizes, obtainingresults similar to those from studies with the Hubble Space Telescope, thoughwe find a higher fraction of compact star forming galaxies at $z>2$. Todisentangle the star-forming galaxies from active galactic nuclei (AGN), we usemultiwavelength data from surveys in the optical and infrared, includingfar-infrared data from Herschel, as well as new radio continuum data from theAustralia Telescope Compact Array and Very Large Array. We identifyultraluminous infrared galaxies (ULIRGs) at $z \sim 1-3$, which consist of acombination of pure starburst galaxies and Active Galactic Nuclei(AGN)/starburst composites. The ULIRGs show signs of recent merger activity,such as highly disturbed morphologies and include a rare candidate triple AGN.We find that AGN tend to reside in hosts with smaller scale sizes than purelystar-forming galaxies of similar infrared luminosity. Our observationsdemonstrate the potential for MCAO to complement the deeper galaxy surveys tobe made with the James Webb Space Telescope.

A subarcsecond near-infrared view of massive galaxies at z > 1 with Gemini Multiconjugate Adaptive Optics