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We present quantified visual morphologies of approximately 48,000 galaxiesobserved in three Hubble Space Telescope legacy fields by the Cosmic AndNear-infrared Deep Extragalactic Legacy Survey (CANDELS) and classified byparticipants in the Galaxy Zoo project. 90% of galaxies have z < 3 and areobserved in rest-frame optical wavelengths by CANDELS. Each galaxy received anaverage of 40 independent classifications, which we combine into detailedmorphological information on galaxy features such as clumpiness, barinstabilities, spiral structure, and merger and tidal signatures. We apply aconsensus-based classifier weighting method that preserves classifierindependence while effectively down-weighting significantly outlyingclassifications. After analysing the effect of varying image depth on reportedclassifications, we also provide depth-corrected classifications which bothpreserve the information in the deepest observations and also enable the use ofclassifications at comparable depths across the full survey. Comparing theGalaxy Zoo classifications to previous classifications of the same galaxiesshows very good agreement; for some applications the high number of independentclassifications provided by Galaxy Zoo provides an advantage in selectinggalaxies with a particular morphological profile, while in others thecombination of Galaxy Zoo with other classifications is a more promisingapproach than using any one method alone. We combine the Galaxy Zooclassifications of "smooth" galaxies with parametric morphologies to select asample of featureless disks at 1 < z < 3, which may represent a dynamicallywarmer progenitor population to the settled disk galaxies seen at later epochs.

Galaxy Zoo: Quantitative Visual Morphological Classifications for 48,000 galaxies from CANDELS