Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 435, Issue 4, Pages 2835-2860Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1458
Keywords
methods: data analysis; catalogues; galaxies: elliptical and lenticular; galaxies: general; galaxies: spiral
Categories
Funding
- Leverhulme Trust
- US National Science Foundation [DRL-0941610]
- Science and Technology Facilities Council (STFC) Science in Society programme
- Swiss National Science Foundation [PP00P2_138979/1]
- STFC [ST/J500665/1, ST/K00090X/1]
- Worcester College, Oxford
- Oxford Martin School
- National Aeronautics and Space Administration's Earth Science Technology Office [NCC5-626]
- California Institute of Technology [NCC5-626]
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy, the National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society and the Higher Education Funding Council for England
- Science and Technology Facilities Council [1105957, ST/H007156/1, ST/K00090X/1, ST/J001465/1, ST/I001212/1, ST/J500665/1] Funding Source: researchfish
- Division Of Research On Learning
- Direct For Education and Human Resources [0941610] Funding Source: National Science Foundation
- STFC [ST/J500665/1, ST/J001465/1, ST/I001212/1, ST/K00090X/1, ST/H007156/1] Funding Source: UKRI
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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 Legacy survey with m(r) > 17, in addition to deeper images from SDSS Stripe 82. While the original GZ2 project identified galaxies as early-types, late-types or mergers, GZ2 measures finer morphological features. These include bars, bulges and the shapes of edge-on disks, as well as quantifying the relative strengths of galactic bulges and spiral arms. This paper presents the full public data release for the project, including measures of accuracy and bias. The majority (greater than or similar to 90 per cent) of GZ2 classifications agree with those made by professional astronomers, especially for morphological T-types, strong bars and arm curvature. Both the raw and reduced data products can be obtained in electronic format at ext-link-type=uri xlink:href=http://data.galaxyzoo.org xmlns:xlink=http://www.w3.org/1999/xlink>http://data.galaxyzoo.org.
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