Galaxy Zoo: Quantitative Visual Morphological Classifications for 48,000 galaxies from CANDELS
Creators: name: Simmons, B. D.
name: Lintott, Chris
name: Willett, Kyle W.
name: Masters, Karen L.
name: Kartaltepe, Jeyhan S.
name: Häußler, Boris
name: Kaviraj, Sugata
name: Krawczyk, Coleman
name: Kruk, S. J.
name: McIntosh, Daniel H.
name: Smethurst, R. J.
name: Nichol, Robert C.
name: Scarlata, Claudia
name: Schawinski, Kevin
name: Conselice, Christopher J.
name: Almaini, Omar
name: Ferguson, Henry C.
name: Fortson, Lucy
name: Hartley, William
name: Kocevski, Dale
name: Koekemoer, Anton M.
name: Mortlock, Alice
name: Newman, Jeffrey A.
name: Bamford, Steven P.
name: Grogin, N. A.
name: Lucas, Ray A.
name: Hathi, Nimish P.
name: McGrath, Elizabeth
name: Peth, Michael
name: Pforr, Janine
name: Rizer, Zachary
name: Wuyts, Stijn
name: Barro, Guillermo
name: Bell, Eric F.
name: Castellano, Marco
name: Dahlen, Tomas
name: Ownsworth, Avishai Dekel Jamie
name: Faber, Sandra M.
name: Finkelstein, Steven L.
name: Fontana, Adriano
name: Galametz, Audrey
name: Grützbauch, Ruth
name: Koo, David
name: Lotz, Jennifer
name: Mobasher, Bahram
name: Mozena, Mark
name: Salvato, Mara
name: Wiklind, Tommy
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present quantified visual morphologies of approximately 48,000 galaxies observed in three Hubble Space Telescope legacy fields by the Cosmic And Near-infrared Deep Extragalactic Legacy Survey (CANDELS) and classified by participants in the Galaxy Zoo project. 90% of galaxies have z &lt; 3 and are observed in rest-frame optical wavelengths by CANDELS. Each galaxy received an average of 40 independent classifications, which we combine into detailed morphological information on galaxy features such as clumpiness, bar instabilities, spiral structure, and merger and tidal signatures. We apply a consensus-based classifier weighting method that preserves classifier independence while effectively down-weighting significantly outlying classifications. After analysing the effect of varying image depth on reported classifications, we also provide depth-corrected classifications which both preserve the information in the deepest observations and also enable the use of classifications at comparable depths across the full survey. Comparing the Galaxy Zoo classifications to previous classifications of the same galaxies shows very good agreement; for some applications the high number of independent classifications provided by Galaxy Zoo provides an advantage in selecting galaxies with a particular morphological profile, while in others the combination of Galaxy Zoo with other classifications is a more promising approach than using any one method alone. We combine the Galaxy Zoo classifications of "smooth" galaxies with parametric morphologies to select a sample of featureless disks at 1 &lt; z &lt; 3, which may represent a dynamically warmer progenitor population to the settled disk galaxies seen at later epochs.
description: 30 pages, 14 figures, MNRAS accepted. Galaxy classifications available at data.galaxyzoo.org