J/AN/327/365 Clusters and groups of galaxies in 2dF (Tago+, 2006)
Clusters and groups of galaxies in the 2dF galaxy redshift survey:
a new catalogue.
Tago E., Einasto J., Saar E., Einasto M., Suhhonenko I., Joeveer M.,
Vennik J., Heinamaki P., Tucker D.L.
<Astron. Nachrichten, 327, 365-378 (2006)>
=2006AN....327..365T 2006AN....327..365T
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry
Keywords: cosmology: observations - cosmology: large-scale structure -
galaxies: clusters: general
Abstract:
We create a new catalogue of groups and clusters, applying the
friends-to-friends method to the 2dF GRS final release. We investigate
various selection effects due to the use of a magnitude limited
sample. For this purpose we follow the changes in group sizes and mean
galaxy number densities within the groups when shifting nearby
observed groups to larger distances. We study the distribution of
sizes of dark matter haloes in N-body simulations and compare
properties of these haloes and the 2dF groups.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
2dfgrn.dat 131 10750 Catalogue of the 2dF GRS Northern groups
2dfgrs.dat 131 14465 Catalogue of the 2dF GRS Southern groups
2dfgaln.dat 140 33933 Catalogue of the galaxies in the
2dF GRS Northern groups
2dfgals.dat 140 44984 Catalogue of the galaxies in the
2dF GRS Southern groups
2dfgalni.dat 87 44134 Catalogue of isolated galaxies in the
2dF GRS Northern galactic sky
2dfgalsi.dat 87 61344 Catalogue of isolated galaxies in the
2dF GRS Southern galactic sky
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See also:
VII/226 : The 2dF Galaxy Redshift Survey 100k Data Release (2dFGRS Team, 2001)
VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)
J/MNRAS/328/805 : The 2dF QSO Redshift Survey. VIII (Outram+, 2001)
J/A+A/462/811 : Superclusters of galaxies from 2dF (Einasto+, 2007)
Byte-by-byte Description of file: 2dfgrn.dat 2dfgrs.dat
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Bytes Format Units Label Explanations
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2- 6 I5 --- Group Group number
10- 12 I3 --- Rich Rrichness (number of member galaxies)
14- 25 F12.8 deg RAdeg Right ascension, in decimal degrees (J2000)
(mean of member galaxies)
27- 38 F12.8 deg DEdeg Declination, in decimal degrees (J2000)
(mean of member galaxies)
41- 48 F8.4 Mpc cdist Comoving distance in Mpc/h
(mean of member galaxies)
52- 57 F6.4 Mpc SizeSky Maximum projected size (in Mpc/h)
60- 69 F10.6 km/s sigma rms radial velocity (velocity dispersion)
72- 79 F8.6 Mpc Rvir Virial radius in Mpc/h
81- 92 E12.6 solLum Lgal1 Luminosity of the main galaxy (G1)
94-105 E12.6 solLum Lgalv Total observed luminosity of galaxies in
the visibility window (G1)
107-118 E12.6 solLum Ltot1 Estimated total luminosity of the group
using param. set 1 (G1)
120-131 E12.6 solLum Ltot2 Estimated total luminosity of the group
using param. set 2 (G1)
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Byte-by-byte Description of file: 2dfgaln.dat 2dfgals.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Galaxy Galaxy ID number
8- 12 I5 --- Group Group ID number
16- 18 I3 --- Rich Group richness
21- 32 F12.8 deg RAdeg Right ascension, in decimal degrees (J2000)
33- 44 F12.8 deg DEdeg Declination, in decimal degrees (J2000)
47- 54 F8.6 --- z Original redshift
57- 64 F8.4 Mpc cdist Co-moving distance in Mpc/h,
corrected for the CMB
68- 74 F7.4 mag bjmag bj magnitude
77- 84 F8.4 mag bjMAG Absolute magnitude
88- 94 F7.4 mag bj-br Colour bj-br
97-104 F8.4 --- SpClass ?=-99.9000 spectral classification
(if -99 then absent) (eta)
107-114 F8.2 km/s Vpec Peculiar velocity
116-127 E12.6 solLum Lobs Observed luminosity
129-140 E12.6 solLum Ltot Estimated total luminosity
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Byte-by-byte Description of file: 2dfgalni.dat 2dfgalsi.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Galaxy Galaxy ID number
12 I1 --- Rich [1] Richness (number of member galaxies)
14- 25 F12.8 deg RAdeg Right ascension, in decimal degrees (J2000)
(mean of member galaxies)
27- 38 F12.8 deg DEdeg Declination (J2000), in decimal degrees
(mean of member galaxies)
41- 48 F8.4 Mpc cdist Comoving distance in Mpc/h
(mean of member galaxies)
50- 61 E12.6 solLum Lgal Luminosity of the cluster main galaxy (G1)
63- 74 E12.6 solLum Lgalv Total observed luminosity of galaxies in
the visibility window (G1)
76- 87 E12.6 solLum Ltot Estimated total luminosity of the group (G1)
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Global Notes:
Note (G1):
Luminosities are expressed in units of h-2L☉.
The luminosity window corresponds to to galaxies having their
corrected apparent magnitude bJ in the range [13.5,19.45]mag.
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History:
Copied at http://www.aai.ee/~maret/2dfgr.html
(End) Patricia Vannier [CDS] 04-Dec-2006