J/A+A/437/883 K20 survey: spectroscopic catalogue (Mignoli+, 2005)
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 2005A&A...437..883M
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 52arcmin2. 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 =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).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 97 545 K20 redshift survey results:
CDFS and QSO 0055-2659 fields
sp/* . 524 FITS spectra
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See also:
J/A+A/392/395 : Ks-band magnitudes of the K20 sample (Cimatti+, 2002)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Seq K20 identification number,
CDFS_NNNNN or q0055_NNNNN
13- 14 I2 h RAh Right ascension (J2000.0)
16- 17 I2 min RAm Right ascension (J2000.0)
19- 24 F6.3 s RAs Right ascension (J2000.0)
26 A1 --- DE- Declination sign (J2000.0)
27- 28 I2 deg DEd Declination (J2000.0)
30- 31 I2 arcmin DEm Declination (J2000.0)
33- 37 F5.2 arcsec DEs Declination (J2000.0)
39- 43 F5.2 mag Ksmag Total (SExtractor BEST) Ks-band magnitude
45- 48 F4.2 mag R-K R-K colour index, measured in a 2"-diameter
aperture corrected to total
50- 54 F5.3 --- z ? Spectroscopic redshift
55 A1 --- --- [I] (indef) when no redshift (q_z=-1)
56- 57 I2 --- q_z [-1/1]? Quality flag on redshfit (1)
59- 61 A3 --- Class Spectroscopic classes code (2)
63- 79 A17 --- FileName Spectra file name in "sp" subdirectory
81- 92 A12 --- Com Comment
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Note (1): Quality flag on redshfit as follows:
1 = solid redshift determination;
0 = tentative redshift determination;
-1 = no redshfit determination.
Note (2): Spectroscopic classes as follows:
0 = objects classified as stars;
1 = red passive early-type galaxies;
2 = blue emission-line galaxies;
1.5 = intermediate galaxies with emission lines but red continuum indices;
3 = galaxies which are not included in one of the three previous classes;
4 = broad-line AGN.
We remind that objects with only a tentative redshift (q_z=0)
are not classified.
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History:
Spectra copied from http://www.arcetri.astro.it/~k20
References:
Cimatti et al., Paper I 2002A&A...381L..68C 2002A&A...381L..68C
Daddi et al., Paper II 2002A&A...384L...1D 2002A&A...384L...1D
Cimatti et al., Paper III 2002A&A...392..395C 2002A&A...392..395C, Cat. J/A+A/392/395
Cimatti et al., Paper IV 2002A&A...391L...1C 2002A&A...391L...1C
Pozzetti et al., Paper V 2003A&A...402..837P 2003A&A...402..837P
Fontana et al., Paper VI 2004A&A...424...23F 2004A&A...424...23F
(End) Patricia Vannier [CDS] 01-Jul-2005