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

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dc.contributor.authorWillett, Kyle W.
dc.contributor.authorLintott, Chris J.
dc.contributor.authorBamford, Steven P.
dc.contributor.authorMasters, Karen L.
dc.contributor.authorSimmons, Brooke D.
dc.contributor.authorCasteels, Kevin R. V.
dc.contributor.authorEdmondson, Edward M.
dc.contributor.authorFortson, Lucy F.
dc.contributor.authorKaviraj, Sugata
dc.contributor.authorKeel, William C.
dc.contributor.authorMelvin, Thomas
dc.contributor.authorNichol, Robert C.
dc.contributor.authorRaddick, M. Jordan
dc.contributor.authorSchawinski, Kevin
dc.contributor.authorSimpson, Robert J.
dc.contributor.authorSkibba, Ramin A.
dc.contributor.authorSmith, Arfon M.
dc.contributor.authorThomas, Daniel
dc.contributor.otherUniversity of Minnesota System
dc.contributor.otherUniversity of Minnesota Twin Cities
dc.contributor.otherUniversity of Oxford
dc.contributor.otherUniversity of Nottingham
dc.contributor.otherUniversity of Portsmouth
dc.contributor.otherInstitut d'Estudis Espacials de Catalunya (IEEC)
dc.contributor.otherUniversity of Barcelona
dc.contributor.otherUniversity of Hertfordshire
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherJohns Hopkins University
dc.contributor.otherSwiss Federal Institutes of Technology Domain
dc.contributor.otherETH Zurich
dc.contributor.otherUniversity of California System
dc.contributor.otherUniversity of California San Diego
dc.date.accessioned2018-09-21T20:24:00Z
dc.date.available2018-09-21T20:24:00Z
dc.date.issued2013-09-22
dc.description.abstractWe 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.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationWillett, K. et al. (2013): Galaxy Zoo 2: detailed morphological classifications for 304 122 galaxies from the Sloan Digital Sky Survey. Monthly Notices of the Royal Astronomical Society, 435(4). DOI: https://doi.org/10.1093/mnras/stt1458
dc.identifier.doi10.1093/mnras/stt1458
dc.identifier.orcidhttps://orcid.org/0000-0001-7821-7195
dc.identifier.orcidhttps://orcid.org/0000-0002-6325-5671
dc.identifier.orcidhttps://orcid.org/0000-0003-0846-9578
dc.identifier.orcidhttps://orcid.org/0000-0001-5464-0888
dc.identifier.orcidhttps://orcid.org/0000-0002-5601-575X
dc.identifier.orcidhttps://orcid.org/0000-0002-3957-2474
dc.identifier.orcidhttps://orcid.org/0000-0001-5882-3323
dc.identifier.orcidhttps://orcid.org/0000-0002-1067-8558
dc.identifier.orcidhttps://orcid.org/0000-0003-2896-2503
dc.identifier.urihttp://ir.ua.edu/handle/123456789/3931
dc.languageEnglish
dc.language.isoen_US
dc.publisherOxford University Press
dc.subjectmethods: data analysis
dc.subjectcatalogues
dc.subjectgalaxies: elliptical and lenticular
dc.subjectgalaxies: general
dc.subjectgalaxies: spiral
dc.subjectEARLY DATA RELEASE
dc.subjectMILKY-WAY PROJECT
dc.subjectDISC GALAXIES
dc.subjectHUBBLE SEQUENCE
dc.subjectNEARBY GALAXIES
dc.subjectPLANET HUNTERS
dc.subjectSTAR-FORMATION
dc.subjectCATALOG
dc.subjectSDSS
dc.subjectREDSHIFT
dc.subjectAstronomy & Astrophysics
dc.titleGalaxy Zoo 2: detailed morphological classifications for 304 122 galaxies from the Sloan Digital Sky Surveyen_US
dc.typetext
dc.typeArticle

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