J/A+A/540/A123 Galaxy clusters from SDSS DR8 (Einasto+, 2012)
Multimodality in galaxy clusters from SDSS DR8:
substructure and velocity distribution.
Einasto M., Vennik J., Nurmi P., Tempel E., Ahvensalmi A., Tago E.,
Liivamaegi L.J., Saar E., Heinaemaeki P., Einasto J., Martinez V.J.
<Astron. Astrophys., 540, A123-123 (2012)>
=2012A&A...540A.123E 2012A&A...540A.123E
ADC_Keywords: Clusters, galaxy ; Surveys
Keywords: large-scale structure of Universe - galaxies: clusters: general
Abstract:
The study of the signatures of multimodality in groups and clusters of
galaxies, an environment for most of the galaxies in the Universe,
gives us information about the dynamical state of clusters and about
merging processes, which affect the formation and evolution of
galaxies, groups and clusters, and larger structures - superclusters
of galaxies and the whole cosmic web.
We search for the presence of substructure, a non-Gaussian,
asymmetrical velocity distribution of galaxies, and large peculiar
velocities of the main galaxies in clusters with at least 50 member
galaxies, drawn from the SDSS DR8.
Description:
We employ a number of 3D, 2D, and 1D tests to analyse the distribution
of galaxies in clusters: 3D normal mixture modelling, the
Dressler-Shectman test, the Anderson-Darling and Shapiro-Wilk tests,
as well as the Anscombe-Glynn and the D'Agostino tests. We find the
peculiar velocities of the main galaxies, and use principal component
analysis to characterise our results.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 72 109 Data on clusters
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See also:
VII/4 : Abell and Zwicky Clusters of Galaxies (Abell+ 1974)
J/AN/327/365 : Clusters and groups of galaxies in 2dF (Tago+, 2006)
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)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq Identification number of the cluster
7- 9 I3 --- Ngal Number of galaxies in the cluster
11- 16 F6.2 deg RAdeg Cluster right ascension (J2000)
18- 22 F5.2 deg DEdeg Cluster declination (J2000)
24- 29 F6.2 Mpc Dist Cluster comoving distance (in Mpc/h)
31- 36 F6.2 10+10Lsun Ltot Cluster total luminosity (in 1010Lsun/h2)
38- 44 F7.2 km/s sigma rms velocity of galaxies in the cluster
46- 49 F4.2 Mpc rvir Cluster virial radius (in Mpc/h)
51- 54 A4 --- ACO ? Abell ID of the cluster
55 A1 --- --- [,]
57- 60 A4 --- ACO2 ? Second Abell ID of the cluster
61 A1 --- --- [,]
63- 66 A4 --- ACO3 ? Third Abell ID of the cluster
67 A1 --- --- [,]
69- 72 A4 --- ACO4 ? Fourth Abell ID of the cluster
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Jun-2012