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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 71 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
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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.
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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
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Bytes Format Units Label Explanations
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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)
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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).
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Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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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
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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).
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History:
From electronic version of the journal
References:
McConnachie et al., Paper I 2008MNRAS.387.1281M 2008MNRAS.387.1281M
Brasseur et al., Paper II 2009MNRAS.392.1141B 2009MNRAS.392.1141B
(End) Patricia Vannier [CDS] 29-Jul-2010