MegaZ-LRG catalogue J/MNRAS/375/68 ivo://CDS.VizieR/J/MNRAS/375/68 doi:10.26093/cds/vizier.73750068 CDS Collister A. Lahav O. Blake C. Cannon R. Croom S. Drinkwater M.,Edge A. Eisenstein D. Loveday J. Nichol R. Pimbblet K. De Propris R.,Roseboom I. Ross N. Schneider D.P. Shanks T. Wake D. 2024-07-04T20:17:55Z 2008-06-29T15:44:53Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr surveys galaxies catalogs redshifted photometry We describe the construction of MegaZ-LRG, a photometric redshift catalogue of over one million luminous red galaxies (LRGs) in the redshift range 0.4<z<0.7 with limiting magnitude i<20. The catalogue is selected from the imaging data of the Sloan Digital Sky Survey (SDSS) Data Release 4. The 2dF-SDSS LRG and Quasar (2SLAQ) spectroscopic redshift catalogue of 13000 intermediate-redshift LRGs provides a photometric redshift training set, allowing use of ANNZ, a neural network-based photometric-redshift estimator. The rms photometric redshift accuracy obtained for an evaluation set selected from the 2SLAQ sample is z=0.049 averaged over all galaxies, and z=0.040 for a brighter subsample (i<19.0). The catalogue is expected to contain ~5 per cent stellar contamination. The ANNZ code is used to compute a refined star/galaxy probability based on a range of photometric parameters; this allows the contamination fraction to be reduced to 2 per cent with negligible loss of genuine galaxies. The MegaZ-LRG catalogue is publicly available on the World Wide Web from http://www.2slaq.info . 2007MNRAS.375...68C https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/375/68 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to II/267 : The SDSS Photometric Catalog, Release 4 (Adelman-McCarthy+, 2006) VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004) J/MNRAS/372/425 : 2dF-SDSS Luminous Red Galaxy Survey, 2SLAQ (Cannon+, 2006) http://www.sdss.org/ : SDSS Home Page http://www.2slaq.info : 2SLAQ Website https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/375/68 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/375/68 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/375/68 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/375/68 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/375/68 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/375/68 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/375/68/catalog (MegaZ-LRG photometric redshift catalogue) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/375/68/catalog? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/375/68/catalog? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/375/68/catalog? 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21857-21859 21868 21871 21917 21919 21941 21952 21955 21984 21988 21990-21991 21993 21995 22012-22013 22337 22340-22341 22352 22481 22483 22491 22524-22525 22710-22711 22713-22715 22760 22762-22763 23043 23064-23066 23068 23076-23078 23080 23104 23142 23148-23150 23175 23185-23187 23201-23203 23220 23236 23240 25559 25563 25575 25579 25821-25823 25837-25839 25841-25843 25885-25887 25901-25903 25905-25907 25921-25923 25985-25987 26135 26139 26151 26155 26344-26345 26347 26588-26590 26604-26606 26608-26610 26877-26879 26932-26933 26941-26943 27021-27023 27025-27027 27041-27043 27197-27199 27213-27215 27217-27219 27233-27235 27277-27279 27281-27283 27297-27299 27468-27470 27480-27481 27483 27612 27620-27622 27624-27625 27892 27896 27956 27960 27972 27976 28036 28040 28204-28206 28208-28210 28228 28232 28288-28289 28503 28507 28519 28523 28567 28571 28583 28585-28587 29973 30016 30023 30029-30031 30044-30046 30053 30068 30975 31139 31148 31279 31285-31287 31289-31291 31309-31311 31315 31324 31326 31344-31346 31351 31363 31388-31390 31408-31410 31413-31415 31417-31419 31424-31426 31429-31431 31433-31435 31488 31522-31523 31526-31527 31538-31539 31542 31548 31609 31611 31614 31632-31634 31640 31652-31654 31660 31685-31687 31700 31713 31715 31721-31723 31728-31730 32302-32303 32314-32315 32387 32393 32395 32417 32419 32425-32427 32454 32467 32470 32484 32486 32650 32672 32674 36607 36702-36703 36711 36715 36721-36723 36758-36759 36761-36763 36771 36792-36794 36796 36812-36814 36816-36818 36820 36832 36855 36859 36861-36863 40957-40959 45023 45039 45043 48981 48983 48987 49005-49007 49055 49077-49079 49081 49091 49108 49112 49114 49124-49126 49143 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/375/68?format=ascii Optical default J/MNRAS/375/68/catalog MegaZ-LRG photometric redshift catalogue recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int SDSS SDSS object identification number meta.id;meta.main 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 umag ? Dereddened u band magnitude mag phot.mag;em.opt.U float nullable gmag Dereddened g band magnitude mag phot.mag;em.opt.B float rmag Dereddened r band magnitude mag phot.mag;em.opt.R float imag Dereddened i band magnitude mag phot.mag;em.opt.I float zmag Dereddened z band magnitude mag phot.mag;em.opt.I float i(dev) Dereddened de Vaucouleurs i band magnitude mag phot.mag;em.opt.I float zph ANNZ Photometric redshift (2) src.redshift float S/G [0,1] ANNZ Star/galaxy class (3) meta.id float SDSS6 Detailed data from SDSS-DR6 (Cat. II/282) meta.ref.url char SDSSdata Display the SDSS data and image for this galaxy meta.ref.url char