Galaxy Zoo 2: detailed morphological classifications for 304 122 galaxies from the Sloan Digital Sky Survey

We present the data release for Galaxy Zoo 2 (GZ2), a citizen science project with more than 16 million morphological classifications of 304 122 galaxies drawn from the Sloan Digital Sky Survey (SDSS). Morphology is a powerful probe for quantifying a galaxy's dynamical history; however, automatic classifications of morphology (either by computer analysis of images or by using other physical parameters as proxies) still have drawbacks when compared to visual inspection. The large number of images available in current surveys makes visual inspection of each galaxy impractical for individual astronomers. GZ2 uses classifications from volunteer citizen scientists to measure morphologies for all galaxies in the DR7…

• NS
  National Science Foundation

  Awards: 0941610, PP00P2_138979
• UD
  U.S. Department of Energy
• NA
  National Aeronautics and Space Administration

  Award: NCC5-626
• AP
  Alfred P. Sloan Foundation
• PU
  Princeton University
• OS
  Ohio State University
• CI
  California Institute of Technology
• UO
  University of Washington
• JH
  Johns Hopkins University
• UO
  University of Pittsburgh
• CW
  Case Western Reserve University
• DU
  Drexel University
• UB
  Universität Basel
• UO
  University of Portsmouth
• NM
  New Mexico State University
• LT
  Leverhulme Trust
• SN
  Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

  Awards: PP00P2_138979, PP00P2_138979/1
• CA
  Chinese Academy of Sciences
• M
  Max-Planck-Gesellschaft
• MF
  Max-Planck-Institut für Astronomie
• SA
  Science and Technology Facilities Council

  Awards: ST/H007156/1, ST/J500665/1, ST/J001465/1, ST/K00090X/1, K00090X/1, ST/K00090X/1, ST/J500665/1, ST/I001212/1
• UN
  U.S. Naval Observatory
• F
  Fermilab
• LA
  Los Alamos National Laboratory