SDSS automated morphology classification J/A+A/525/A157 ivo://CDS.VizieR/J/A+A/525/A157 doi:10.26093/cds/vizier.35250157 CDS Huertas-Company M. Aguerri J.A.L. Bernardi M. Mei S. Sanchez Almeida J. 2011-02-27T21:17:20Z 2010-12-10T13:57:47Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr surveys galaxies spectroscopy galaxy-classification-systems We present an automated morphological classification in 4 types (E, S0, Sab, Scd) of ~700 000 galaxies from the SDSS DR7 spectroscopic sample based on support vector machines. The main new property of the classification is that we associate a probability to each galaxy of being in the four morphological classes instead of assigning a single class. The classification is therefore better adapted to nature where we expect a continuous transition between different morphological types. The algorithm is trained with a visual classification and then compared to several independent visual classifications including the Galaxy Zoo first-release catalog. We find a very good correlation between the automated classification and classical visual ones. 2011A&A...525A.157H https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/525/A157 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to http://www.sdss.org : SDSS Home Page https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/525/A157 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/525/A157 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/525/A157 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/525/A157 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/525/A157 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/525/A157 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/525/A157/catalog (Automated probabilistic morphological classification of SDSS DR7 catalog) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/525/A157/catalog? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/525/A157/catalog? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/525/A157/catalog? 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49077-49079 49081 49091 49108 49112 49114 49124-49126 49147 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/525/A157?format=ascii Optical default J/A+A/525/A157/catalog Automated probabilistic morphological classification of SDSS DR7 catalog recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ID [1,699684] Sequential number meta.record int DR7 Details of the SDSS-DR7 photometry for this galaxy meta.ref.url char RAJ2000 Right ascension in decimal degrees (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 Declination in decimal degrees (J2000) deg pos.eq.dec;meta.main indexed z Redshift (from SDSS-DR7) src.redshift pE/S0 Probability of being early-type (E or S0) stat.fit.goodness float pE Probability of being elliptical stat.fit.goodness float pS0 Probability of being S0 type stat.fit.goodness float pSab Probability of being Sa or Sb stat.fit.goodness float pScd Probability of being Sc or Sd stat.fit.goodness float ASK [0/27] Spectral class from Sanchez Alemida et al. (2010ApJ...714..487A) in classes.dat file meta.code.class int SpecObjID SDSS SpecObjID meta.id char
J/A+A/525/A157/classes Main properties of the ASK classes (from Sanchez Alemida et al., 2010ApJ...714..487A) recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ASK [0/27] ASK Class meta.id int primary n_ASK [*] Major class (1) meta.note char N Number of members in SDSS DR7 meta.number int u-g SDSS u-g computed colour index (2) mag phot.color;em.opt.U;em.opt.B float g-r SDSS g-r computed colour index(2) mag phot.color;em.opt.B;em.opt.R float r-i SDSS r-i computed colour index(2) mag phot.color;em.opt.R;em.opt.I float EWHb Equivalent width of Hbeta (3) 0.1nm spect.line.eqWidth;em.line.Hbeta float EW[OIII] Equivalent width of [OIII] lambda5007 (3) 0.1nm spect.line.eqWidth;em.line.OIII float EWHa Equivalent width of Halpha (3) 0.1nm spect.line.eqWidth;em.line.Halpha float EW[NII] Equivalent width of [N II] lambda6583 (3) 0.1nm spect.line.eqWidth float Em Percentage of galaxies in the class with Hbeta in emission according to the SDSS/DR7 catalog % meta.number int Clust Clustering (Good, Neutral) meta.code char