J/A+A/540/A106ivo://CDS.VizieR/J/A+A/540/A106doi:10.26093/cds/vizier.35400106CDSTempel E.Tago E.Liivamagi L.J.2014-03-07T07:27:43Z2012-04-05T07:52:12ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxy-clustersgalaxiescatalogsphotometryWe create a new catalogue of groups and clusters for the SDSS Data Release 8 sample. We add environmental parameters to our catalogue, together with other galaxy parameters (e.g., morphology), missing from our previous catalogues. We use a modified friends-of-friends (FoF) method with a variable linking length in the transverse and radial directions to eliminate selection effects and to find reliably as many groups as possible to track the supercluster network. We use the groups of galaxies as a basis to determine the luminosity density field. We take into account various selection effects caused by a magnitude limited sample. Our final sample contains 576493 galaxies and 77858 groups. The group catalogue is available at http://www.aai.ee/~elmo/dr8groups/ and from the Strasbourg Astronomical Data Center (CDS).2012A&A...540A.106Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/540/A106CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/306 : The SDSS Photometric Catalog, Release 8 (Adelman-McCarthy+, 2011)J/A+A/514/A102 : SDSS DR7 groups of galaxies (Tago+, 2010)J/A+A/479/927 : Group of galaxies in SDSS 5 (Tago+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/540/A106https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/540/A106http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/540/A106https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/540/A106https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/540/A106http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/540/A106GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/540/A106/dr8gal (Galaxy parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/540/A106/dr8gal?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/540/A106/dr8gal?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/540/A106/dr8gal?GETtext/xml+votable180.050000true251.1607428.22250.005555555555555556Cone search capability for table J/A+A/540/A106/dr8gr (Group/cluster parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/540/A106/dr8gr?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/540/A106/dr8gr?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/540/A106/dr8gr?GETtext/xml+votable180.050000true251.1690528.180230.0055555555555555561/5 8 10 27 2/16-17 19 25 28 38 103 107 3/72-73 75 97 116 144 146-147 176-178 184 407 409-411 421 423 427 494 4/297 299 399 468-469 472 580 582-583 592 594 600 602 624 716 718 740 744-746 1373 1375 1599 1621-1623 1625-1627 1690-1691 1701-1703 1707 1961-1963 1965-1967 1980 1982-1983 2027 5/1184-1185 1187 1193 1540-1541 1549 1585 1588-1589 1685 1728-1729 1732-1733 1880-1882 1884 1896-1898 1900-1901 2325 2327 2504-2506 2528 2530 2536 2868 2870 2876 2878 2968-2970 2988 5461-5463 5469 5471 5491 5588-5589 5591 5597 5599 6391 6395 6461-6463 6477-6479 6481-6483 6497-6499 6535 6541-6543 6735 6757-6759 6821-6823 6825-6827 7786 7823 7827 7829-7831 7833-7834 7838 7841-7843 7856 7858-7859 7882-7883 7886 7924 7926 8099 8102-8103 8105 8107 8114 8120 8122 8125 8127 8170 11261-11263 6/4744-4745 4747 4769 4780-4781 4783 6149 6168-6169 6172-6173 6175 6205 6207 6337 6339 6363 6365-6367 6739 6976-6977 6980-6981 6992-6993 6996-6997 7532-7533 7540 7568-7570 7572-7573 7576 7579 7582-7583 7596-7597 7608-7609 7612-7613 7680-7681 7684-7685 7696-7697 7700-7701 9296-9298 9304 9306-9307 9520 9522 9528 9530 9616 9618 9624-9626 9648 9650 9656 9658 10000 10028 10030 10116 10118 10124 10152-10154 11476-11478 11484 11486 11508 11520 11522 11528 11530 11552 11856-11858 11864 11884 11956 11960-11961 11968-11970 21843 21873 21883 21959 21963 21988 21991 21997 21999 22341 22360-22361 22363 22385 22485 22487 25559 25575 25579 25821-25823 25835 25837-25839 25841-25843 25885-25887 25901-25903 25905-25907 25921-25923 25985-25987 26135 26139 26151 26155 26157-26159 26161-26163 26871 26877-26879 26903 26909-26911 26933 26935 27015 27019 27021-27023 27025-27027 27197-27199 27213-27215 27277-27279 27281-27283 27297-27299 30973-30975 31138-31139 31148 31150 31286 31289-31291 31303 31307 31313-31315 31329-31331 31340-31342 31344-31346 31357-31359 31363 31429-31431 31488-31490 31548 31550-31551 31594 31598-31599 31611 31700 31710 32391 32402-32403 32406-32407 32425-32427 32460 32462 32478 32484 32486 32492 32494-32495 32497 32499 32505-32507 32672 32674 32678 32684 32686 40957 40959 45023 45039 45043https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/540/A106?format=asciiOpticaldefaultJ/A+A/540/A106/dr8galGalaxy parametersgmagGalactic extinction corrected Petrosian g-magnitudemagphot.mag;em.opt.BfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDUnique identification number for galaxiesmeta.id;meta.mainintIDcl[1/388773] Group/cluster ID number (1)meta.idintNgal[1/878] Richness of group the galaxy belongs tometa.numberintzRedshift, corrected to CMB rest framesrc.redshiftdoubleDistCo-moving distance of a galaxy (G1)Mpcpos.distancefloatDist.cCo-moving distance of the group centre (G1)Mpcpos.distancefloatRAJ2000Right ascension of galaxy (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination of galaxy (J2000)degpos.eq.dec;meta.mainindexedGLONGalactic longitude of galaxydegpos.galactic.lonGLATGalactic latitude of galaxydegpos.galactic.latdoubleumagGalactic extinction corrected Petrosian u-magnitudemagphot.mag;em.opt.UfloatrmagGalactic extinction corrected Petrosian r-magnitudemagphot.mag;em.opt.RfloatimagGalactic extinction corrected Petrosian i-magnitudemagphot.mag;em.opt.IfloatzmagGalactic extinction corrected Petrosian z-magnitudemagphot.mag;em.opt.IfloatuMAGAbsolute u-magnitude (G1)magphys.magAbsfloatgMAGAbsolute g-magnitude (G1)magphys.magAbsfloatrMAGAbsolute r-magnitude (G1)magphys.magAbsfloatiMAGAbsolute i-magnitude (G1)magphys.magAbsfloatzMAGAbsolute z-magnitude (G1)magphys.magAbsfloatkcoruK-correction in u-filtermagarith.factor;phot.magfloatkcorgK-correction in g-filtermagarith.factor;phot.magfloatkcorrK-correction in r-filtermagarith.factor;phot.magfloatkcoriK-correction in i-filtermagarith.factor;phot.magfloatkcorzK-correction in z-filtermagarith.factor;phot.magfloatLrr-band observed luminosity (G1)1e+10solLumphys.luminosityfloatWWeight factor for the galaxystat.weightfloatRank[1/878] Galaxy rank in its groupstat.fit.paramintDen1? Normalised environmental density at 1Mpc/h (G1)phys.density;arith.ratiodoublenullableDen2? Normalised environmental density at 2Mpc/h (G1)phys.density;arith.ratiodoublenullableDen4? Normalised environmental density at 4Mpc/h (G1)phys.density;arith.ratiodoublenullableDen8? Normalised environmental density at 8Mpc/h (G1)phys.density;arith.ratiodoublenullableDen16? Normalised environmental density at 16Mpc/h (G1)phys.density;arith.ratiodoublenullableEdgeCo-moving distance from the survey mask (G1)Mpcpos.distancefloatMph[0/2] Morphology of galaxy, 1=S, 2=E (2)meta.code;src.morphintprEProbability of being an early type galaxystat.fit.goodnessfloatIDDR7ID number to link to our previous DR7 catmeta.idintzobsObserved redshift (without CMB correction)src.redshift;pos.heliocentricdoubleDistcorCorrected co-moving distance of galaxy (G1) (in Mpc/h)Mpcpos.distancefloatfc[0/5] Number of missing neighbours (fibre collision) (G2)meta.numberintSloanDisplay the SDSS data for this galaxymeta.ref.urlcharDR8Details from the SDSS-DR8 photometrymeta.ref.urlcharJ/A+A/540/A106/dr8grGroup/cluster parametersDen4? Environmental density for group at a=4Mpc/h (G1)phys.density;arith.ratiodoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDcl[1/77858] Group/cluster ID numbermeta.idintNgal[2/878] Group richnessmeta.numberintzclRedshift to the group centresrc.redshift;pos.heliocentricdoubleDist.cCo-moving distance to the group centre (G1)Mpcpos.distancefloatRAJ2000Right ascension of group centre (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination of group centre (J2000)degpos.eq.dec;meta.mainindexedGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latdoubleSizeMax linear size of the group in the sky (G1)Mpcphys.size.radiusfloatRvirVirial radius (projected harmonic mean) (G1)Mpcphys.size.radiusfloatsigmaExtent of the group in the sky (G1)Mpcphys.angSizefloatsigmavrms radial velocity deviationkm/sphys.veloc.dispersionfloatLrobsr-band observed luminosity (G1)1e+10solLumphys.luminosityfloatLrtotr-band estimated total luminosity (G1)1e+10solLumphys.luminosityfloatDlinkCo-moving linking length (G1)Mpcpos.distancefloatDen1? Environmental density for group at a=1Mpc/h (G1)phys.density;arith.ratiodoublenullableDen2? Environmental density for group at a=2Mpc/h (G1)phys.density;arith.ratiodoublenullableDen8? Environmental density for group at a=8Mpc/h (G1)phys.density;arith.ratiodoublenullableDen16? Environmental density for group at a=16Mpc/h (G1)phys.density;arith.ratiodoublenullableEdgeMinimum distance from survey mask (G1)Mpcpos.distancefloatfc[0/64] Number of potentially missing fibre collision galaxies (G2)meta.numberint