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J/ApJ/625/6   Galaxy groups in the DEEP2 Galaxy Redshift Survey   (Gerke+, 2005)

The DEEP2 Galaxy Redshift Survey: first results on galaxy groups. Gerke B.F., Newman J.A., Davis M., Marinoni C., Yan R., Coil A.L., Conroy C., Cooper M.C., Faber S.M., Finkbeiner D.P., Guhathakurta P., Kaiser N., Koo D.C., Phillips A.C., Weiner B.J., Willmer C.N.A. <Astrophys. J., 625, 6-22 (2005)> =2005ApJ...625....6G
ADC_Keywords: Clusters, galaxy ; Redshifts ; Velocity dispersion Keywords: galaxies: clusters: general - galaxies: high-redshift Abstract: We use the first 25% of the DEEP2 Galaxy Redshift Survey spectroscopic data to identify groups and clusters of galaxies in redshift space. The data set contains 8370 galaxies with confirmed redshifts in the range 0.7≤z≤1.4, over 1°2 on the sky. Groups are identified using an algorithm (the Voronoi-Delaunay method) that has been shown to accurately reproduce the statistics of groups in simulated DEEP2-like samples. We optimize this algorithm for the DEEP2 survey by applying it to realistic mock galaxy catalogs and assessing the results using a stringent set of criteria for measuring group-finding success, which we develop and describe in detail here. We present the first DEEP2 group catalog, which assigns 32% of the galaxies to 899 distinct groups with two or more members, 153 of which have velocity dispersions above 350km/s. We provide locations, redshifts and properties for this high-dispersion subsample. This catalog represents the largest sample to date of spectroscopically detected groups at z∼1. Description: The survey consists of four fields on the sky, chosen to lie in zones of low Galactic dust extinction. Three-band (BRI) photometry has been obtained for each of these fields using the CFH12K camera on the Canada-France-Hawaii Telescope (CFHT). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 33 153 Locations and properties of groups with σ≥350km/s
See also: J/ApJS/142/1 : DEEP Groth Strip Survey. II. (Simard+, 2002) J/ApJ/599/1006 : DEEP Groth Strip Survey. VII. (Kobulnicky+, 2003) J/ApJS/157/175 : DEEP Groth Strip Survey. VIII. (Koo+, 2005) J/ApJ/571/136 : DEEP Groth Strip survey. X. (Im+, 2002) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Hour of Right Ascension (J2000) (2) (1) 4- 5 I2 min RAm Minute of Right Ascension (J2000) (2) (1) 7- 8 I2 s RAs Second of Right Ascension (J2000) (2) (1) 10 A1 --- DE- Sign of the Declination (J2000) (2) (1) 11- 12 I2 deg DEd Degree of Declination (J2000) (2) (1) 14- 15 I2 arcmin DEm Arcminute of Declination (J2000) (2) (1) 17- 18 I2 arcsec DEs Arcsecond of Declination (J2000) (2) (1) 20- 24 F5.3 --- z Redshift (2) 26- 28 I3 km/s sigma Velocity dispersion 30- 31 I2 --- NGal Number of galaxies 33 A1 --- SDet [Y] Strong detection (3)
Note (1): [GND2005] JHHMMSS+DDMMSS in Simbad Note (2): Median value of all galaxies in the group. Note (3): "Y" indicates detection in both the standard and high-purity group catalogs.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 23-Nov-2005
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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