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J/A+A/437/883 K20 survey: spectroscopic catalogue (Mignoli+, 2005)
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The K20 survey - VII. The spectroscopic catalogue:
Spectral properties and evolution of the galaxy population.
Mignoli M., Cimatti A., Zamorani G., Pozzetti L., Daddi E., Renzini A.,
Broadhurst T., Cristiani S., D'Odorico S., Fontana A., Giallongo E.,
Gilmozzi R., Menci N., Saracco P.
<Astron. Astrophys. 437, 883 (2005)>
=2005A&A...437..883M
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ADC_Keywords: Galaxies, spectra ; Galaxies, photometry ; Redshifts
Keywords: galaxies: evolution - galaxies: distances and redshifts
Abstract:
The K20 survey is a near infrared-selected, deep (Ks<20) redshift
survey targeting galaxies in two independent regions of the sky, the
Chandra Deep Field South and the field around the quasar 0055-2659,
for a total area of 52arcmin^2^. The total Ks-selected sample includes
545 objects. Low-resolution (R 300-600) optical spectra for 525 of
them have been obtained with the FORS1/FORS2 spectrographs at the
ESO/VLT, providing 501 spectroscopic identifications (including 12
type-1 AGN and 45 stars); consequently, we were able to measure
redshifts and identify stars in 96% of the observed objects, whereas
the spectroscopic completeness with respect to the total
photometrically selected sample is 92% (501/545). The K20 survey is
therefore the most complete spectroscopic survey of a near
infrared-selected sample to date. The K20 survey contains 444
spectroscopically identified galaxies, covering a redshift range of
0.05<z<2.73, with a mean redshift <z>=0.75; excluding the 32
"low-quality" redshifts does not significantly change these values.
Description:
The spectroscopic observations were obtained at the ESO Very Large
Telescope (VLT) UT1 and UT2 equipped with FORS1 and FORS2,
respectively. The optical spectroscopy was collected during 20 nights
distributed over a period of four years (1999-2000, 20002).