J/MNRAS/395/255 Compact groups of galaxies in SDSS DR6 (McConnachie+, 2009)
Compact groups in theory and practice. III. Compact groups of galaxies in the sixth data release of the Sloan Digital Sky Survey. McConnachie A.W., Patton D.R., Ellison S.L., Simard L. <Mon. Not. R. Astron. Soc., 395, 255-268 (2009)> =2009MNRAS.395..255M
ADC_Keywords: Surveys ; Clusters, galaxy ; Morphology Keywords: catalogues - surveys - galaxies: general - galaxies: interactions Abstract: We present the largest publicly available catalogue of compact groups (CGs) of galaxies identified using the original selection criteria of Hickson, selected from the Sixth Data Release of the Sloan Digital Sky Survey (SDSS DR6). We identify 2297 CGs down to a limiting magnitude of r=18 (∼0.24groups/deg2), and 74791 CGs down to a limiting magnitude of r=21 (∼6.7groups/deg2). This represents 0.9 per cent of all galaxies in the SDSS DR6 at these magnitude levels. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 72 2297 *Compact groups identified in Catalogue A table2.dat 72 74791 *Compact groups identified in Catalogue B table3.dat 102 9713 *Individual member galaxies in each compact group found in Catalogue A table4.dat 102 313508 *Individual member galaxies in each compact group found in Catalogue B
Note on table1.dat, table2.dat: ranked in order of decreasing surface brightness Note on table3.dat, table4.dat: galaxies in each group are listed in order of descending r-band luminosity.
See also: J/AJ/127/1811 : Catalog of SDSS compact groups of galaxies (Lee+, 2004) J/ApJS/167/1 : Galaxy groups and clusters from SDSS (Berlind+, 2006) J/A+A/474/783 : Main galaxy groups from SDSS-DR5 (Deng+, 2007) J/A+A/479/927 : Group of galaxies in SDSS 5 (Tago+, 2008) J/A+A/514/A102 : SDSS DR7 groups of galaxies (Tago+, 2010) http://www.sdss.org : SDSS Home Page Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 6 A6 --- --- [SDSSCG] 7 A1 --- Cat [AB] Catalogue 8- 12 I05 --- Group Group number 14- 15 I2 h RAh Geometrical center of group Right ascension (J2000) 17- 18 I2 min RAm Geometrical center of group Right ascension (J2000) 20- 23 F4.1 s RAs [0/60] Geometrical center of group Right ascension (J2000) 25 A1 --- DE- Geometrical center of group Declination sign (J2000) 26- 27 I2 deg DEd Geometrical center of group Declination (J2000) 29- 30 I2 arcmin DEm Geometrical center of group Declination (J2000) 32- 35 F4.1 arcsec DEs [0/60] Geometrical center of group Declination (J2000) 37 I1 --- Nm Number of members in the group 39- 44 F6.3 mag/arcsec2 SuBr Group surface brightness in r band 46- 49 F4.2 arcmin Rad Group radius, defined by the Hickson criteria 51- 55 F5.2 --- Dist Distance to the next nearest non-member galaxy in the galaxy catalogue (1) 57- 61 F5.2 mag rmag Apparent Petrosian magnitude of brightest group galaxy, corrected for foreground Galactic extinction 63 I1 --- Nz Number of galaxies in the group with a spectroscopic redshift 65- 70 F6.3 --- z ?=99.999 Redshift of group (2) 72 I1 --- Flag [0/1]? Flag indicating if the group contains members which were originally identified as belonging to groups in Catalogue A which were subsequently identified as containing contamination (flag = 1 if true, 0 if false)
Note (1): in the appropriate magnitude range, measured from the group centre in units of the group radius. Note (2): If only one galaxy has a spectroscopic redshift, then that is adopted as the group redshift. If multiple members of the group have redshifts, the mean redshift is listed. Only considers groups with ΔV≤1000km/s (see Section 3.1.2 for definition). Only considers galaxies with zconf≥0.7 (see paper for definition).
Byte-by-byte Description of file: table.dat
Bytes Format Units Label Explanations
1- 6 A6 --- --- [SDSSCG] 7 A1 --- Cat [AB] Catalogue 8- 12 I05 --- Group Group number 13 A1 --- --- [.] 14- 15 A2 --- Gal Galaxy number in Group 17- 34 A18 --- objID SDSS ObjID (1) 36- 37 I2 h RAh Galaxy Right ascension (J2000) 39- 40 I2 min RAm Galaxy Right ascension (J2000) 42- 45 F4.1 s RAs [0/60] Galaxy Right ascension (J2000) 47 A1 --- DE- Galaxy Declination sign (J2000) 48- 49 I2 deg DEd Galaxy Declination (J2000) 51- 52 I2 arcmin DEm Galaxy Declination (J2000) 54- 57 F4.1 arcsec DEs [0/60] Galaxy Declination (J2000) 59- 63 F5.2 --- rmag r-band apparent Petrosian magnitude of galaxy, corrected for foreground Galactic extinction 65- 69 F5.2 mag g-r (g-r) colour index of galaxy, corrected for foreground Galactic extinction. No k correction has been applied 71- 88 A18 --- spObjID ?=0 SDSS SpecObjID (2) 90- 95 F6.3 --- zconf [0/1]?=99.900 SDSS redshift confidence level (3) 97-102 F6.3 --- z ?=99.900 Redshift
Note (1): Unique identifier of object in the SDSS data base which can be used to retrieve all information stored in the SDSS on the galaxy. Note (2): Unique identifier of the SDSS spectrum for this galaxy. Note (3): If a spectrum exists for the galaxy, this parameter indicates how reliable the derived redshift is 0(poor)≤zconf≤1(excellent).
History: From electronic version of the journal References: McConnachie et al., Paper I 2008MNRAS.387.1281M Brasseur et al., Paper II 2009MNRAS.392.1141B
(End) Patricia Vannier [CDS] 29-Jul-2010
|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|