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We present the results from a new search for candidate galaxies at z ~ 8.5-11discovered over the 850 arcmin^2 area probed by the Cosmic AssemblyNear-Infrared Deep Extragalactic Legacy Survey (CANDELS). We use a photometricredshift selection including both Hubble and Spitzer Space Telescope photometryto robustly identify galaxies in this epoch at F160W < 26.6. We use a detailedvetting procedure, including screening for persistence, stellar contamination,inclusion of ground-based imaging, and followup space-based imaging to build arobust sample of 11 candidate galaxies, three presented here for the firsttime. The inclusion of Spitzer/IRAC photometry in the selection process reducescontamination, and yields more robust redshift estimates than Hubble alone. Weconstrain the evolution of the rest-frame ultraviolet luminosity function via anew method of calculating the observed number densities without choosing aprior magnitude bin size. We find that the abundance at our brightest probedluminosities (M_UV=-22.3) is consistent with predictions from simulations whichassume that galaxies in this epoch have gas depletion times at least as shortas those in nearby starburst galaxies. Due to large Poisson and cosmic varianceuncertainties we cannot conclusively rule out either a smooth evolution of theluminosity function continued from z=4-8, or an accelerate decline at z > 8. Wecalculate that the presence of seven galaxies in a single field (EGS) is anoutlier at the 2-sigma significance level, implying the discovery of asignificant overdensity. These scenarios will be imminently testable to highconfidence within the first year of observations of the James Webb SpaceTelescope.

A Census of the Bright z=8.5-11 Universe with the Hubble and Spitzer Space Telescopes in the CANDELS Fields