J/A+A/542/A36 Rich clusters from SDSS DR8 (Einasto+, 2012)
Multimodality of rich clusters from the SDSS DR8 within the
supercluster-void network.
Einasto M., Liivamaegi L.J., Tempel E., Saar E., Vennik J., Nurmi P.,
Gramann M., Einasto J., Tago E., Heinaemaeki P., Ahvensalmi A.,
Martinez V.J.
<Astron. Astrophys., 542, A36-36 (2012)>
=2012A&A...542A..36E 2012A&A...542A..36E
ADC_Keywords: Galaxy catalogs; Clusters, galaxy
Keywords: large-scale structure of Universe - galaxies: clusters: general
Abstract:
The study of the properties of galaxy clusters and their environment
gives us information about the formation and evolution of galaxies,
groups and clusters, and larger structures - superclusters of
galaxies and the whole cosmic web.
We study the relations between the multimodality of galaxy clusters
drawn from the SDSS DR8 and the environment where they reside. As
cluster environment we consider the global luminosity density field,
supercluster membership, and supercluster morphology.
Description:
We use 3D normal mixture modelling, the Dressler-Shectman test, and
the peculiar velocity of cluster main galaxies as signatures of
multimodality of clusters. We calculate the luminosity density field
to study the environmental densities around clusters, and to find
superclusters where clusters reside. We determine the morphology of
superclusters with the Minkowski functionals and compare the
properties of clusters in superclusters of different morphology. We
apply principal component analysis to study the relations between the
multimodality parameters of clusters and their environment
simultaneously.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 92 109 Data on clusters
table6.dat 71 50 Data on superclusters
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See also:
J/A+AS/123/119 : The supercluster-void network. I. (Einasto+ 1997)
J/AJ/122/2222 : Superclusters of Abell and X-ray clusters (Einasto+, 2001)
J/A+A/459/L1 : Supercluster sample from SDSS DR4 (Einasto+, 2006)
J/AN/327/365 : Clusters and groups of galaxies in 2dF (Tago+, 2006)
J/A+A/462/811 : Superclusters of galaxies from 2dF (Einasto+, 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)
J/A+A/540/A106 : SDSS-DR8 groups and clusters of galaxies (Tempel+, 2012)
J/A+A/539/A80 : SDSS DR7 superclusters. The catalogues (Liivamagi+, 2012)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq ID of cluster
7- 9 I3 --- Ngal Number of galaxies in the cluster
11- 13 I3 10+10Lsun Ltot Total luminosity of the cluster,
(in 1010h-2Lsun)
15- 18 I4 km/s sigma rms velocity of the cluster σ
20- 23 F4.2 Mpc rvir Virial radius of the cluster (in Mpc/h)
25- 29 I5 km/s Vpec Peculiar velocity of the main galaxy
31 I1 --- Nc Number of components in the cluster
33 A1 --- l_pDS Limit flag on pDS
34- 39 F6.4 --- pDS p-value of the Δ test (Dressler-Shectman
test, 1988AJ.....95..985D 1988AJ.....95..985D)
41- 46 F6.1 --- D4 ?=-999 Environmental density around the
cluster, at smoothing lengths 4Mpc/h (1)
48- 53 F6.1 --- D8 ?=-999 Environmental density around the
cluster, at smoothing lengths 8Mpc/h (1)
55- 60 F6.1 --- D16 ?=-999 Environmental density around the
cluster, at smoothing lengths 16Mpc/h (1)
62- 65 I4 --- ID8 [0/1295]?=0 ID of the supercluster where
the cluster resides in table6
67- 92 A26 --- Abell Abell ID(s) of the cluster
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Note (1): in units of the mean density; -999 denotes cluster at the edge of a
survey where the density cannot be calculated).
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- IDscl Long ID of a supercluster AAA+BBB+ZZZZ (1)
14- 17 I4 --- ID8 ID of a supercluster from the SDSS DR8
superclusters catalogue
19- 22 I4 --- ID7 ID of a supercluster from the SDSS DR7
superclusters catalogue (Liivamagi et al.,
2012, Cat. J/A+A/539/A80)
24- 27 I4 --- Ngal Number of galaxies in the supercluster
29- 31 I3 Mpc Dist Distance of supercluster (in Mpc/h)
33- 36 I4 10+10Lsun Ltot Total weighted luminosity of galaxies in the
supercluster (in 10+10h-2^Lsun)
38- 41 F4.1 --- Dpeak Density at the density maximum, in units of
mean density
43- 46 F4.1 --- V3 Maximum value of the fourth Minkowski
functional V3 (clumpiness) for the supercluster
48- 52 F5.2 --- K1 Shapefinders K1 (planarity) for the full
supercluster
54- 58 F5.2 --- K2 Shapefinders K2 (filamentarity) for the full
supercluster
60- 65 F6.2 --- K1/K2 Ratio of the shapefinders K1/K2 for the full
supercluster
67 A1 --- Mt [FS] Morphological type of a supercluster
(Filament or Spider)
69- 71 I3 --- SCl ? Supercluster ID in the catalogue by Einasto
et al. (2001, Cat. J/AJ/122/2222) (2)
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Note (1): where AAA is RA, ±BBB is Dec (in degrees), and ZZZZ is 1000z
Note (2): Peculiar superclusters:
* SCl 160: the Hercules supercluster,
* SCl 111 and SCl 126: members of the Sloan Great Wall,
* SCl 158: the Corona Borealis supercluster,
* SCl 138: the Bootes supercluster,
* SCl 336: the Ursa Major supercluster.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 31-Jul-2012