J/A+A/392/395ivo://CDS.VizieR/J/A+A/392/395doi:10.26093/cds/vizier.33920395CDSCimatti A.Mignoli M.Daddi E.Pozzetti L.Fontana A.Saracco P.,Poli F.Renzini A.Zamorani G.Broadhurst T.Cristiani S.D'Odorico S.,Giallongo E.Gilmozzi R.Menci N.2003-02-15T21:29:51Z2003-02-15T22:29:31ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryinfrared-photometryThe K20 survey is an ESO VLT optical and near-infrared spectroscopic survey aimed at obtaining spectral information and redshifts of a complete sample of about 550 objects to K_s_<=20.0 over two independent fields with a total area of 52arcmin^2^. In this paper we discuss the scientific motivation of such a survey, we describe the photometric and spectroscopic properties of the sample, and we release the K_s_-band photometric catalog. Extensive simulations showed that the sample is photometrically highly complete to K_s_=20. The observed galaxy counts and the R-K_s_ color distribution are consistent with literature results. We observed spectroscopically 94% of the sample, reaching a spectroscopic redshift identification completeness of 92% to K_s_<=20.0 for the observed targets, and of 87% for the whole sample (i.e. counting also the unobserved targets). Deep spectroscopy was complemented with multi-band deep imaging in order to derive tested and reliable photometric redshifts for the galaxies lacking of spectroscopic redshifts. The results show a very good agreement between the spectroscopic and the photometric redshifts with <z_(spe)_-z_(phot)_>=0.01 and with a dispersion of {sigma}_({Delta}z)_=0.09. Using both the spectroscopic and the photometric redshifts, we reached an overall redshift completeness of about 98%. The size of the sample, the redshift completeness, the availability of high quality photometric redshifts and multicolor spectral energy distributions make the K20 survey database one of the most complete samples available to date for constraining the currently competing scenarios of galaxy formation and for a variety of other galaxy evolution studies.2002A&A...392..395Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/392/395CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/392/395https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/392/395http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/392/395https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/392/395https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/392/395http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/392/395GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/392/395/cdfsk (Positions and magnitudes in the CDFS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/392/395/cdfsk?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/392/395/cdfsk?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/392/395/cdfsk?GETtext/xml+votable180.050000true53.1321667-27.81088330.005555555555555556Cone search capability for table J/A+A/392/395/0055k (Positions and magnitudes in the 0055-269 field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/392/395/0055k?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/392/395/0055k?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/392/395/0055k?GETtext/xml+votable180.050000true14.4802917-26.6828750.0055555555555555566/16656 35935https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/392/395?format=asciiOpticalInfrareddefaultJ/A+A/392/395/cdfskPositions and magnitudes in the CDFSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identification numbermeta.id;meta.maincharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainKsKs-band total magnitudemagphot.mag;em.IR.Kfloate_KsKs-band total magnitude 1sigma errormagstat.errorfloatJ/A+A/392/395/0055kPositions and magnitudes in the 0055-269 fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identification numbermeta.id;meta.maincharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainKsKs-band total magnitudemagphot.mag;em.IR.Kfloate_KsKs-band total magnitude 1sigma errormagstat.errorfloat