2005A&A...443...17A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST15:03:24

2005A&A...443...17A - Astronomy and Astrophysics, volume 443, 17-27 (2005/11-3)

The build-up of the Coma cluster by infalling substructures.

ADAMI C., BIVIANO A., DURRET F. and MAZURE A.

Abstract (from CDS):

We present a new multiwavelength analysis of the Coma cluster subclustering based on recent X-ray data and on a compilation of nearly 900 redshifts. We characterize subclustering using the Serna & Gerbal (1996A&A...309...65S) hierarchical method, which makes use of galaxy positions, redshifts, and magnitudes, and identify 17 groups. One of these groups corresponds to the main cluster, one is the well known group associated with the infalling galaxy NGC 4839, and one is associated with NGC 4911/NGC 4926. About one third of the 17 groups have velocity distributions centered on the velocities of the very bright cluster galaxies they contain (magnitudes R<13). In order to search for additional substructures, we made use of the isophotes of X-ray brightness residuals left after the subtraction of the best-fit β-model from the overall X-ray gas distribution (Neumann et al., 2003A&A...400..811N). We selected galaxies within each of these isophotes and compared their velocity distributions with that of the whole cluster. We confirm in this way the two groups associated, respectively, with NGC 4839, and with the southern part of the extended western substructure visible in X-rays. We discuss the group properties in the context of a scenario in which Coma is built by the accretion of groups infalling from the surrounding large-scale structure. We estimate the recent mass accretion rate of Coma and compare it with hierarchical models of cluster evolution.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: Coma

Nomenclature: Table 2: [ABD2005] GNN (Nos G1-G17).

CDS comments: Table1 and figures 3/4: read "NGC 4952" instead of "NGC 4852"

Simbad objects: 33

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Number of rows : 33

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 ACO 779 ClG 09 19 48.0 +33 45 32           ~ 241 0
2 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 994 1
3 MLCG 0564 CGG 12 54 16.2 +28 05 01           ~ 2 0
4 NGC 4789 GiG 12 54 19.016 +27 04 04.87   13.12 12.10     ~ 118 2
5 [ABD2005] G6 GrG 12 54 25.5 +27 09 21           ~ 1 0
6 NGC 4816 GiG 12 56 12.136 +27 44 44.05 14.25 13.80 12.84     ~ 121 1
7 [ABD2005] G11 GrG 12 56 34.8 +26 58 33           ~ 1 0
8 [ABD2005] G13 GrG 12 57 20.5 +27 32 25           ~ 1 0
9 [ABD2005] G2 GrG 12 57 21.5 +27 31 54           ~ 1 0
10 NGC 4839 rG 12 57 24.353 +27 29 51.80 13.56 13.02 12.06     ~ 420 3
11 [ABD2005] G16 GrG 12 57 29.9 +29 01 11           ~ 1 0
12 NGC 4841 LIN 12 57 31.978 +28 28 36.86   13.5       ~ 132 0
13 [ABD2005] G12 GrG 12 57 38.2 +27 40 21           ~ 3 0
14 MLCG 0636 CGG 12 57 48.9 +27 52 01           ~ 4 0
15 [ABD2005] G3 GrG 12 57 53.1 +28 20 20           ~ 1 0
16 [ABD2005] G9 GrG 12 58 51.4 +27 48 17           ~ 4 0
17 MLCG 1527 CGG 12 59 09.8 +27 46 39           ~ 5 0
18 NGC 4874 LIN 12 59 35.709 +27 57 33.80 13.01 13.7 11.40 12.122 11.386 ~ 713 3
19 [ABD2005] G10 GrG 12 59 37.9 +28 10 05           ~ 1 0
20 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4208 2
21 [ABD2005] G1 GrG 12 59 55.4 +27 59 13           ~ 2 0
22 NGC 4889 BiC 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 642 1
23 NGC 4911 LIN 13 00 56.0616026595 +27 47 27.151217355 14.58 13.7 13.33 12.601 12.068 ~ 179 0
24 [ABD2005] G15 GrG 13 01 12.9 +29 01 15           ~ 2 0
25 [ABD2005] G4 GrG 13 01 25.6 +27 46 03           ~ 1 0
26 NGC 4921 LIN 13 01 26.1220299719 +27 53 09.631792431   13.7       ~ 170 0
27 [ABD2005] G7 GrG 13 01 47.4 +28 01 10           ~ 2 0
28 NGC 4926 LIN 13 01 53.731 +27 37 28.01   14.1       ~ 149 0
29 NGC 4944 GiG 13 03 49.9448514200 +28 11 08.557001189   13.3   12.69   ~ 93 0
30 [ABD2005] G5 GrG 13 04 21.5 +27 58 00           ~ 1 0
31 NGC 4952 LIN 13 04 58.392 +29 07 20.50   13.39 13.01     ~ 84 1
32 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1101 1
33 ClG J2334+4851 ClG 23 34 02.7 +48 51 08           ~ 6 1

    Equat.    Gal    SGal    Ecl

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2020.07.02-15:03:24

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