2015A&A...580A..69E


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.21CET18:03:34

2015A&A...580A..69E - Astronomy and Astrophysics, volume 580A, 69-69 (2015/8-1)

Unusual A2142 supercluster with a collapsing core: distribution of light and mass.

EINASTO M., GRAMANN M., SAAR E., LIIVAMAGI L.J., TEMPEL E., NEVALAINEN J., HEINAEMAEKI P., PARK C. and EINASTO J.

Abstract (from CDS):

Superclusters of galaxies can be used to test cosmological models of the formation and evolution of the largest structures in the cosmic web, and of galaxy and cluster evolution in superclusters. We study the distribution, masses, and dynamical properties of galaxy groups in the A2142 supercluster. We analyse the global luminosity density distribution in the supercluster and divide the supercluster into the high-density core and the low-density outskirts regions. We find galaxy groups and filaments in these regions, calculate their masses and mass-to-light ratios and analyse their dynamical state with 1D and 3D statistics. We use the spherical collapse model to study the dynamical state of the supercluster. In the A2142 supercluster rich groups and clusters lie along an almost straight line forming the 50h–1Mpc long main body of the supercluster. The A2142 supercluster has a very high density core surrounded by lower-density outskirts. The total estimated mass of the supercluster is Mest=6.2x1015M. More than a half of groups with at least ten member galaxies in the supercluster lie in the high-density core of the supercluster, centred at the X-ray cluster A2142. Most of the groups in the core region are multimodal. In the outskirts of the supercluster, the number of groups is larger than in the core, and groups are poorer. The orientation of the axis of the cluster A2142 follows the orientations of its X-ray substructures and radio halo, and is aligned along the supercluster axis. The high-density core of the supercluster with the global density D8≥17 and perhaps with D8≥13 may have started to collapse. A2142 supercluster with collapsing core and straight body, is an unusual object among superclusters. In the course of the future evolution, the supercluster may split into several systems.

Abstract Copyright:

Journal keyword(s): cosmology: miscellaneous - large-scale structure of Universe - galaxies: groups: general

Nomenclature: Table 2: [EGS2015] NN (Nos 1-14).

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SCl 1 SCG 00 06.6 +32 58           ~ 7 0
2 [EGS2015] 9 GrG 02 43 20.84 +26 57 24.3           ~ 1 0
3 NAME LOCAL SUPERCL SCG 12 31 +12.4           ~ 443 0
4 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 482 0
5 NAME BOO SUPERCL SCG 14 01.5 +25 09           ~ 22 1
6 ACO 1958 ClG 14 43 13 +30 58.3           ~ 51 0
7 NAME Corona Borealis SCG 15 25 +29.5           ~ 116 0
8 NAME HERCULES SUPERCL SCG 15 47 +18.2           ~ 137 1
9 [EGS2015] 1 GrG 15 54 08.77 +27 28 14.5           ~ 1 0
10 NAME ACO 2142 supercluster SCG 15 56 +27.           ~ 6 0
11 [EGS2015] 2 GrG 15 58 05.26 +27 19 28.7           ~ 2 0
12 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 661 0
13 [EGS2015] 3 GrG 15 59 08.26 +26 34 00.0           ~ 1 0
14 [EGS2015] 4 GrG 16 00 27.61 +26 43 04.0           ~ 1 0
15 [EGS2015] 5 GrG 16 00 32.94 +27 00 57.1           ~ 1 0
16 [EGS2015] 6 GrG 16 00 49.44 +25 52 17.0           ~ 1 0
17 [EGS2015] 7 GrG 16 01 32.00 +26 10 11.4           ~ 1 0
18 [EGS2015] 8 GrG 16 03 00.44 +25 24 30.9           ~ 1 0
19 [EGS2015] 10 GrG 16 03 48.77 +24 57 24.0           ~ 1 0
20 [EGS2015] 11 GrG 16 04 56.01 +24 31 39.6           ~ 1 0
21 [EGS2015] 12 GrG 16 07 38.11 +23 12 38.4           ~ 1 0
22 [EGS2015] 13 GrG 16 11 40.59 +21 01 13.2           ~ 1 0
23 [EGS2015] 14 GrG 16 12 19.89 +20 46 23.8           ~ 1 0
24 NAME Sloan Great Wall ? ~ ~           ~ 152 0
25 NAME A2199 Supercluster SCG ~ ~           ~ 15 0

    Equat.    Gal    SGal    Ecl

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2020.01.21-18:03:34

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