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J/AJ/123/2976       The UZC-SSRS2 group catalog                (Ramella+, 2002)

The UZC-SSRS2 group catalog. Ramella M., Geller M.J., Pisani A., da Costa L.N. <Astron. J. 123, 2976 (2002)> =2002AJ....123.2976R
ADC_Keywords: Clusters, galaxy ; Radial velocities ; Redshifts ; Cross identifications Keywords: catalogs - galaxies: clusters: general - galaxies: distances and redshifts Abstract: We apply a friends-of-friends algorithm to the combined Updated Zwicky Catalog (UZC, Cat. J/PASP/111/438 )and Southern Sky Redshift Survey (SSRS2, Cat. J/AJ/116/1) to construct a catalog of 1168 groups of galaxies; 411 of these groups have five or more members within the redshift survey. The group catalog covers 4.69 sr, and all groups exceed the number density contrast threshold, δP/P=80. We demonstrate that the groups catalog is homogeneous across the two underlying redshift surveys; the catalog of groups and their members thus provides a basis for other statistical studies of the large-scale distribution of groups and their physical properties. The median physical properties of the groups are similar to those for groups derived from independent surveys, including the ESO Key Programme and the Las Campanas Redshift Survey. We include tables of groups and their members. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 58 1168 UZC-SSRS2 Group Catalog table2.dat 48 6846 USGC Member Galaxies table3.dat 12 149 Cross-references for RPG97 Groups table4.dat 14 60 Cross-references for RASSCALS
See also: J/A+A/391/35 : Compact Groups in the UZC galaxy sample (Focardi+, 2002) J/PASP/111/438 : Updated Zwicky catalog (UZC) (Falco+, 1999) J/AJ/116/1 : Southern Sky Redshift Survey (SSRS2) (Da Costa+, 1998) J/AJ/113/483 : Groups of Galaxies (Ramella+ 1997) J/ApJ/534/114 : RASSCALS: X-ray and optical study (Mahdavi+, 2000) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- USGC Identification number (G1) 6- 8 I3 --- Num Number of member galaxies 10- 11 I2 h RAh Hour of Right Ascension (J2000) 13- 14 I2 min RAm Minute of Right Ascension (J2000) 16- 19 F4.1 s RAs Second of Right Ascension (J2000) 21 A1 --- DE- Sign of the Declination (J2000) 22- 23 I2 deg DEd Degree of Declination (J2000) 25- 26 I2 arcmin DEm Arcminute of Declination (J2000) 28- 29 I2 arcsec DEs Arcsecond of Declination (J2000) 31- 35 I5 km/s cz Mean redshift 37- 40 I4 km/s e_cz The velocity dispersion in cz 42- 45 F4.2 Mpc Rad Virial radius in units Mpc/h (2) 47- 51 F5.2 [solMass] log(M) Logarithm of the virial mass in solar units 53- 57 F5.2 [Sun] log(M/L) Log of the mass-to-light ratio in solar units
Note (2): Where H0 = 100h.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- USGC Identification number (G1) 7- 9 I3 --- Num Number of member galaxies 11- 12 I2 h RAh Hour of Right Ascension (J2000) 14- 15 I2 min RAm Minute of Right Ascension (J2000) 17- 20 F4.1 s RAs Second of Right Ascension (J2000) 22 A1 --- DE- Sign of the Declination (J2000) 23- 24 I2 deg DEd Degree of Declination (J2000) 26- 27 I2 arcmin DEm Arcminute of Declination (J2000) 29- 30 I2 arcsec DEs Arcsecond of Declination (J2000) 33- 36 F4.1 mag mag Magnitude (UNNN: Zwicky Bmag, SNNN: SSRS2 mag) 38- 42 I5 km/s HRV Heliocentric radial velocity 45- 47 I3 km/s e_HRV Error in HRV
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- RPG 4- 6 A3 --- RPG97 The Ramella et al. (1997, Cat. <J/AJ/113/483>) group label (1) 8- 11 A4 --- USGC This paper group label (G1)
Note (1): Only Ramella et al. (1997, Cat. J/AJ/113/483) groups with Nmember≥5.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 7 A7 --- RASSCALS The RASSCALS (Mahdavi et al., 2000, Cat. J/ApJ/534/114) label (1) 10- 13 A4 --- USGC This paper group label (G1)
Note (1): Only Madhavi et al., 2000, Cat. J/ApJ/534/114, groups with extended X-ray emission.
Global notes: Note (G1): Identification number: U = USGC, <USGC UNNN> (Nos U001-U864) in Simbad S = SSRS2, <USGC SNNN> (Nos S001-S304) in Simbad
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 06-Sep-2002
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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