========================================================================== J/A+A/392/395 Ks-band magnitudes of the K20 sample (Cimatti+, 2002) The following files can be converted to FITS (extension .fit .fgz or .fiZ) 0055k.dat cdfsk.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/A+A/392/395 ==========================================================================
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Beginning of ReadMe : J/A+A/392/395 Ks-band magnitudes of the K20 sample (Cimatti+, 2002) ================================================================================ The K20 survey. III. Photometric and spectroscopic properties of the sample. Cimatti 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. <Astron. Astrophys. 392, 395 (2002)> =2002A&A...392..395C ================================================================================ ADC_Keywords: Galaxies, photometry ; Photometry, infrared Keywords: galaxies: fundamental parameters - galaxies: photometry - galaxies: distances and redshifts Abstract: The 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_(Deltaz)_=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. Description: Ks-band "total" magnitudes of the K20 sample galaxies. For each galaxy, the ID name, equatorial coordinates (J2000), total magnitudes and magnitude errors (1sigma) are given. A magnitude error equal to 0.30 magnitudes means that the object was deblended. The magnitudes are not corrected for Galactic extinction. According to the maps of Schlegel et al. (1998ApJ...500..525S), the extinction are A_K_=0.007mag and A_K_=0.003mag in the 0055-269 and in the CDFS fields respectively. The coordinates given in these tables were obtained by applying rigid offsets using USNO stars present in the fields, but no corrections for distorsions were applied because of the small number of suitable stars in each field. Thus, the precision of such coordinates is about +/-0.4" both in RA and in Dec, yielding a total uncertainty in the position of about 0.6" (1sigma).