2012A&A...540A.123E


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.28CET06:07:54

2012A&A...540A.123E - Astronomy and Astrophysics, volume 540A, 123-123 (2012/4-1)

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. and MARTINEZ V.J.

Abstract (from CDS):

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. 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. More than 80% of the clusters in our sample have substructure according to 3D normal mixture modelling, and the Dressler-Shectman (DS) test shows substructure in about 70% of the clusters. The median value of the peculiar velocities of the main galaxies in clusters is 206km/s (41% of the rms velocity). The velocities of galaxies in more than 20% of the clusters show significant non-Gaussianity. While multidimensional normal mixture modelling is more sensitive than the DS test in resolving substructure in the sky distribution of cluster galaxies, the DS test determines better substructure expressed as tails in the velocity distribution of galaxies (possible line-of-sight mergers). Richer, larger, and more luminous clusters have larger amount of substructure and larger (compared to the rms velocity) peculiar velocities of the main galaxies. Principal component analysis of both the substructure indicators and the physical parametres of clusters shows that galaxy clusters are complicated objects, the properties of which cannot be explained with a small number of parametres or delimited by one single test. The presence of substructure, the non-Gaussian velocity distributions, as well as the large peculiar velocities of the main galaxies, shows that most of the clusters in our sample are dynamically young.

Abstract Copyright:

Journal keyword(s): large-scale structure of Universe - Galaxies: clusters: general

VizieR on-line data: <Available at CDS (J/A+A/540/A123): table3.dat>

Nomenclature: Table 3: [EVN2012] NNNNN N=110 among (Nos 18-74783).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 32

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Number of rows : 32

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ACO 602 ClG 07 53 24.2 +29 21 58           ~ 65 0
2 ACO 671 ClG 08 28 31.97 +30 24 19.7           ~ 151 0
3 ACO 1035 ClG 10 32 07.51 +40 15 49.2           ~ 82 0
4 ACO 1066 ClG 10 39 06.62 +05 12 35.2           ~ 86 1
5 ACO 1139 ClG 10 58 10.98 +01 36 16.4           ~ 152 3
6 ACO 1238 ClG 11 22 05.37 +00 47 03.0           ~ 90 0
7 ACO 1291 ClG 11 32 11.20 +56 01 31.3           ~ 129 0
8 ACO 1436 ClG 12 00 15.94 +56 15 47.8           ~ 102 0
9 NAME VIRGO-COMA SUPERCL SCG 12 04 +09.0           ~ 16 0
10 ACO 1516 ClG 12 18 50.20 +05 13 56.6           ~ 47 1
11 ACO 1620 ClG 12 50 03.89 -01 32 26.7           ~ 51 0
12 ACO 1650 ClG 12 58 36.76 -01 43 34.2           ~ 277 0
13 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4317 2
14 ACO 1663 ClG 13 02 52.55 -02 31 04.0           ~ 91 0
15 ACO 1750 ClG 13 30 49.94 -01 52 22.1           ~ 147 1
16 ACO 1775 ClG 13 41 55.6 +26 21 53           ~ 278 0
17 ACO 1773 ClG 13 42 11.73 +02 13 28.2           ~ 108 0
18 ACO 1809 ClG 13 53 03.72 +05 08 17.7           ~ 157 0
19 ACO 1904 ClG 14 22 11.75 +48 34 07.1           ~ 120 0
20 ACO 1983 ClG 14 52 44.0 +16 44 46           ~ 237 1
21 ACO 1991 ClG 14 54 30.2 +18 37 51           ~ 314 1
22 ACO 2028 ClG 15 09 33 +07 31.6           ~ 69 0
23 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 870 0
24 ACO 2033 ClG 15 11 23.50 +06 19 08.4           ~ 88 0
25 ACO 2040 ClG 15 12 45.2 +07 25 48           ~ 136 1
26 ACO 2069 ClG 15 23 57.9 +29 53 26           ~ 124 0
27 ACO 2089 ClG 15 32 35.9 +28 01 07           ~ 101 0
28 ACO 2092 ClG 15 33 20.93 +31 09 31.7           ~ 124 0
29 NAME HERCULES SUPERCL SCG 15 47 +18.2           ~ 137 1
30 ACO 2169 ClG 16 14 02.75 +49 12 30.7           ~ 57 0
31 ACO 2175 ClG 16 20 30.70 +29 53 31.2           ~ 98 0
32 NAME Sloan Great Wall ? ~ ~           ~ 157 0

    Equat.    Gal    SGal    Ecl

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2021.02.28-06:07:54

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