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We search for z~10 galaxies over ~160 arcmin^2 of WFC3/IR data in the ChandraDeep Field South, using the public HUDF09, ERS, and CANDELS surveys, that reachto 5sigma depths ranging from 26.9 to 29.4 in H_160 AB mag. z>~9.5 galaxycandidates are identified via J_125-H_160>1.2 colors and non-detections in anyband blueward of J_125. Spitzer IRAC photometry is key for separating thegenuine high-z candidates from intermediate redshift (z~2-4) galaxies withevolved or heavily dust obscured stellar populations. After removing 16 sourcesof intermediate brightness (H_160~24-26 mag) with strong IRAC detections, weonly find one plausible z~10 galaxy candidate in the whole data set, previouslyreported in Bouwens et al. (2011). The newer data cover a 3x larger area andprovide much stronger constraints on the evolution of the UV luminosityfunction (LF). If the evolution of the z~4-8 LFs is extrapolated to z~10, sixz~10 galaxies are expected in our data. The detection of only one sourcesuggests that the UV LF evolves at an accelerated rate before z~8. Theluminosity density is found to increase by more than an order of magnitude inonly 170 Myr from z~10 to z~8. This increase is >=4x larger than expected fromthe lower redshift extrapolation of the UV LF. We are thus likely witnessingthe first rapid build-up of galaxies in the heart of cosmic reionization.Future deep HST WFC3/IR data, reaching to well beyond 29 mag, can enable a morerobust quantification of the accelerated evolution around z~10.

Expanded Search for z~10 Galaxies from HUDF09, ERS, and CANDELS Data: Evidence for Accelerated Evolution at z>8?