J/AJ/123/1807ivo://CDS.VizieR/J/AJ/123/1807doi:10.26093/cds/vizier.51231807CDSGoto T.Sekiguchi M.Nichol R.C.Bahcall N.A.Kim R.S.J.Annis J.,Ivezic Z.Brinkmann J.Hennessy G.S.Szokoly G.P.Tucker D.L.2023-04-06T16:50:47Z2006-11-29T14:37:58ZCDS support team

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

cds-question@unistra.frgalaxy-clustersredshiftedWe describe an automated method, the cut-and-enhance (CE) method, for detecting clusters of galaxies in multicolor optical imaging surveys. This method uses simple color cuts, combined with a density enhancement algorithm, to up-weight pairs of galaxies that are close in both angular separation and color. The method is semiparametric, since it uses minimal assumptions about cluster properties in order to minimize possible biases. No assumptions are made about the shape of clusters, their radial profile, or their luminosity function. The method is successful in finding systems ranging from poor to rich clusters of galaxies, of both regular and irregular shape. We determine the selection function of the CE method via extensive Monte Carlo simulations that use both the real, observed background of galaxies and a randomized background of galaxies. We use position-shuffled and color-shuffled data to perform false-positive tests. We have also visually checked all the clusters detected by the CE method. We apply the CE method to the 350{deg}^2^ of the Sloan Digital Sky Survey (SDSS) commissioning data, taken in 1998 September and 1999 March, and construct an SDSS CE galaxy cluster catalog with an estimated redshift and richness for each cluster. The CE method is compared with other cluster selection methods used on SDSS data such as the matched filter, "maxBCG," and Voronoi tessellation techniques. The CE method can be adopted for cluster selection in any multicolor imaging survey.2002AJ....123.1807Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/123/1807CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://www.sdss.org : Sloan Digital Sky Survey Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/123/1807https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/123/1807http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/123/1807https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/123/1807https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/123/1807http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/123/1807GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/123/1807/clusters (Clusters found with the cut-and-enhance method, in the 2 regions |b|<1.25{deg} and RA ranges 145.1-236.0 and 350.5-56.5{deg})https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/123/1807/clusters?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/123/1807/clusters?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/123/1807/clusters?GETtext/xml+votable180.050000true148.46855194-1.012250.0055555555555555565/4437-4438 4441-4442 4453-4454 4456-4458 4500-4502 4505-4506 4517-4518 4521-4522 4528 4693-4694 4697 5797-5798 5801-5802 6483 6485-6486 6489-6490 6501-6502 6505-6506 6549-6550 6553-6554 6565-6566 6569-6570 6741-6742 6745-6746 6757-6758 6761-6762 6805-6806 6809-6810 7845-7846 7849-7850 6/0-2 8192-8194 17405-17407 17661-17663 17726-17727 17741-17743 17745-17747 17756-17758 17761-17763 17772-17774 17776-17778 17784 17805-17807 17809-17811 17820-17822 17836-17838 17840-17842 17856-17858 17981 17983 17997-17999 18012-18014 18017-18019 18028-18030 18032-18034 18061-18063 18065-18067 18076-18078 18081-18083 18092-18094 18096-18098 18100 18176-18178 18765-18767 18769-18771 18780-18782 18785-18787 18793 18796-18798 18800-18802 19456-19458 23102-23103 23181-23183 23185-23187 23196-23198 23201-23203 23212-23214 23216-23218 23220 23232 23234 25598-25599 25853-25855 25917-25919 25937-25939 25948-25950 25953-25955 25964-25966 25968-25970 25997-25999 26001-26003 26012-26014 26017-26019 26028-26030 26032-26034 26048-26050 26173-26175 26189 26191 26193-26195 26204-26206 26209-26211 26220-26222 26224-26226 26253-26255 26257-26259 26268-26270 26273-26275 26284-26286 26288-26290 26304-26306 26368-26370 26877-26879 26939 26941-26943 26961-26963 26972-26974 26977-26979 26988-26990 26992-26994 27021-27023 27025-27027 27036-27038 27041-27043 27052-27054 27056-27058 27072-27074 27197-27199 27213-27215 27217-27219 27228-27230 27233-27235 27244-27246 27248-27249 27284-27285 27328-27330 27392-27394 27648-27650 31294-31295 31373-31375 31377-31379 31388-31390 31393-31395 31404-31406 31408-31410 31424 31426 36861-36863 45053-45055https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/123/1807?format=asciiOpticaldefaultJ/AJ/123/1807/clustersClusters found with the cut-and-enhance method, in the 2 regions |b|<1.25{deg} and RA ranges 145.1-236.0 and 350.5-56.5{deg}recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension, in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination, in decimal degrees (J2000)degpos.eq.dec;meta.mainRadRadiusdegphys.angSizefloatRichRichness of the cluster (1)src.class.richnessintNgalNumber of galaxies fed (2)stat.paramfloatzEstimated redshift using maxBCG strategysrc.redshiftfloat