/ftp/cats/aliases/K/./KLI2012



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J/ApJ/753/121     zCOSMOS 20k sample group catalog to z< 1.2     (Knobel+, 2012)
The following files can be converted to FITS (extension .fit or fit.gz)
	table4.dat table5.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJ/753/121
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Beginning of ReadMe : J/ApJ/753/121 zCOSMOS 20k sample group catalog to z< 1.2 (Knobel+, 2012) ================================================================================ The zCOSMOS 20k group catalog. Knobel C., Lilly S.J., Iovino A., Kovac K., Bschorr T.J., Presotto V., Oesch P.A., Kampczyk P., Carollo C.M., Contini T., Kneib J.-P., Le Fevre O., Mainieri V., Renzini A., Scodeggio M., Zamorani G., Bardelli S., Bolzonella M., Bongiorno A., Caputi K., Cucciati O., de la Torre S., de Ravel L., Franzetti P., Garilli B., Lamareille F., Le Borgne J.-F., Le Brun V., Maier C., Mignoli M., Pello R., Peng Y., Perez Montero E., Silverman J., Tanaka M., Tasca L., Tresse L., Vergani D., Zucca E., Barnes L., Bordoloi R., Cappi A., Cimatti A., Coppa G., Koekemoer A.M., Lopez-Sanjuan C., McCracken H.J., Moresco M., Nair P., Pozzetti L., Welikala N. <Astrophys. J., 753, 121 (2012)> =2012ApJ...753..121K ================================================================================ ADC_Keywords: Galaxy catalogs ; Redshifts Keywords: catalogs; cosmology: observations; galaxies: evolution; galaxies: groups: general; large-scale structure of universe; methods: data analysis Abstract: We present an optical group catalog between 0.1< z< 1 based on 16500 high-quality spectroscopic redshifts in the completed zCOSMOS-bright survey. The catalog published herein contains 1498 groups in total and 192 groups with more than five observed members. The catalog includes both group properties and the identification of the member galaxies. Based on mock catalogs, the completeness and purity of groups with three and more members should be both about 83% with respect to all groups that should have been detectable within the survey, and more than 75% of the groups should exhibit a one-to-one correspondence to the "real" groups. Particularly at high redshift, there are apparently more galaxies in groups in the COSMOS field than expected from mock catalogs. We detect clear evidence for the growth of cosmic structure over the last seven billion years in the sense that the fraction of galaxies that are found in groups (in volume-limited samples) increases significantly with cosmic time. In the second part of the paper, we develop a method for associating galaxies that only have photo-z to our spectroscopically identified groups. We show that this leads to improved definition of group centers, improved identification of the most massive galaxies in the groups, and improved identification of central and satellite galaxies, where we define the former to be galaxies at the minimum of the gravitational potential wells. Subsamples of centrals and satellites in the groups can be defined with purities up to 80%, while a straight binary classification of all group and non-group galaxies into centrals and satellites achieves purities of 85% and 75%, respectively, for the spectroscopic sample. Description: In this paper we present a new group catalog produced with the zCOSMOS-bright survey (Lilly et al. 2007, Cat. J/ApJS/172/70), which now contains about 16500 high-quality spectroscopic galaxies with I_AB_<=22.5 in the redshift range 0.1< z< 1.2 (the "20k sample"). zCOSMOS-bright covers the  1.7deg^2^ of the COSMOS field which was fully observed by the Hubble Space Telescope down to I_AB_<28 (5sigma) and followed up in more than 30 bands by several telescopes from radio to X-ray wavelengths (Capak et al. 2007, Cat. II/284).