J/MNRAS/329/87 2dF Galaxy Redshift Survey: galaxy clusters (de Propris+, 2002)
The 2dF Galaxy Redshift Survey:
a targeted study of catalogued clusters of galaxies.
de Propris R., Couch W.J., Colless M., Dalton G.B., Collins C., Baugh C.M.,
Bland-Hawthorn J., Bridges T., Cannon R., Cole S., Cross N., Deeley K.,
Driver S.P., Efstathiou G., Ellis R.S., Frenk C.S., Glazebrook K.,
Jackson C., Lahav O., Lewis I., Lumsden S., Maddox S., Madgwick D.,
Moody S., Norberg P., Peacock J.A., Percival W., Peterson B.A.,
Sutherland W., Taylor K.
<Mon. Not. R. Astron. Soc. 329, 87 (2002)>
=2002MNRAS.329...87D 2002MNRAS.329...87D
ADC_Keywords: Clusters, galaxy ; Redshifts ; Velocity dispersion
Keywords: astronomical data bases: miscellaneous - surveys -
galaxies: clusters: general - galaxies: distances and redshifts -
cosmology: observations
Abstract:
We have carried out a study of known clusters within the 2dF Galaxy
Redshift Survey (2dFGRS, Cat. VII/226) observed areas and have
identified 431 Abell, 173 APM and 343 EDCC clusters. Precise
redshifts, velocity dispersions and new centroids have been measured
for the majority of these objects, and this information is used to
study the completeness of these catalogues, the level of contamination
from foreground and background structures along the cluster's line of
sight, the space density of the clusters as a function of redshift,
and their velocity dispersion distributions. We find that the Abell
and EDCC catalogues are contaminated at the level of about 10 per
cent, whereas the APM catalogue suffers only 5 per cent contamination.
If we use the original catalogue centroids, the level of contamination
rises to approximately 15 per cent for the Abell and EDCC catalogues,
showing that the presence of foreground and background groups may
alter the richness of clusters in these catalogues. There is a
deficiency of clusters at z∼0.05 hat may correspond to a large
underdensity in the Southern hemisphere. From the cumulative
distribution of velocity dispersions for these clusters, we derive a
space density of σ>1000km/s clusters of 3.6x10-6h3/Mpc3.
This result is used to constrain models for structure formation; our
data favour low-density cosmologies, subject to the usual assumptions
concerning the shape and normalization of the power spectrum.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 92 894 2dF cluster catalogue
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See also:
VII/226 : The 2dF Galaxy Redshift Survey (Colless+ 2001)
J/MNRAS/329/227 : 2dF Galaxy Redshift Survey. II. (Sadler+, 2002)
VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
VII/175 : Edinburgh-Durham Southern Galaxy Cluster Cat. (Lumsden+ 1992)
J/MNRAS/289/263 : Galaxy clusters from the APM galaxy survey (Dalton+ 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Cluster name (ACO, APMCC or EDCC)
12 A1 --- n_Name [*] * for double or triple systems where more
than one identifiable cluster or group is
present in the line of sight
14- 16 I3 --- APMCC ? APMCC number (Dalton et al., 1997,
Cat. J/MNRAS/289/263)
18- 20 I3 --- EDCC ? EDCC number (Lumsden et al., 1992,
Cat. VII/175)
22- 23 I2 h RAh Cluster centroid right ascension (1950)
25- 26 I2 min RAm Cluster centroid right ascension (1950)
28- 32 F5.2 s RAs Cluster centroid right ascension (1950)
34 A1 --- DE- Cluster centroid declination sign (1950)
35- 36 I2 deg DEd Cluster centroid declination (1950)
38- 39 I2 arcmin DEm Cluster centroid declination (1950)
41- 44 F4.1 arcsec DEs Cluster centroid declination (1950)
46- 51 I6 km/s czp ? Previous cz
53- 57 I5 km/s cz ? 2DF cz
59- 61 I3 km/s e_cz ? rms uncertainty on cz
63- 66 I4 km/s sigma ? Velocity dispersion
68- 71 I4 km/s E_sigma ? Error in sigma (+ve)
73- 76 I4 km/s e_sigma ? Error in sigma (-ve)
78- 80 I3 --- Nclus ? Number of cluster members
82- 85 F4.2 % Comp ? Redshift completeness in the 2° diameter
tile where the cluster is located
87- 91 A5 --- Notes Notes (1)
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Note (1): Notes as follows:
1 = in a random field
2 = foreground group
3 = Wegner et al. (1999, Cat. J/MNRAS/305/259) claim two groups
4 = redshift discrepant
5 = bright E galaxy at this position: cluster centre ?
6 = bright star 'hole' in APM catalog
7 = background group
8 = Mazure et al. (1996, Cat. J/A+A/310/31) claim a third group
9 = Mazure et al. (1996, Cat. J/A+A/310/31) claim a low redshift
group and a higher redshift group
10 = Lumsden et (1992, Cat. VII/175) have a different redshift
11 = Katgert et al. (1996, Cat. J/A+A/310/8) claim multiple systems
12 = merged with 3094 ?
13 = confused with S1043 ?
14 = confused with 4038 ?
15 = possibly embedded in larger structure
16 = same as EDCC 061 ?
17 = same as EDCC 176 ?
18 = same as A2923 ?
19 = same as APMCC 120
20 = same as EDCC 474
21 = same as APM759
22 = same as APM938
23 = same as APM269
24 = coincides with EDCC315
25 = coincides with APM898
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 19-Mar-2002