2004ApJ...613...95C


Query : 2004ApJ...613...95C

2004ApJ...613...95C - Astrophys. J., 613, 95-108 (2004/September-3)

Weak-lensing mass distributions for 24 X-ray Abell clusters.

CYPRIANO E.S., SODRE L.Jr, KNEIB J.-P. and CAMPUSANO L.E.

Abstract (from CDS):

We use the weak gravitational lensing effect to study the mass distribution and dynamical state of a sample of 24 X-ray-luminous clusters of galaxies (0.05<z<0.31) observed with the FORS1 instrument mounted on the VLT-Antu (Unit Telescope 1) under homogeneous sky conditions and subarcsecond image quality. The galaxy shapes were measured in the combined VIR image after deconvolution with a locally determined point-spread function, while the two-dimensional mass distributions of the clusters were computed using an algorithm based on the maximum entropy method. By comparing the mass and light distributions of the clusters in our sample, we find that their centers of mass, for the majority of the clusters, are consistent with the positions of optical centers. We find that some clusters present significant mass substructures that generally have optical counterparts. In at least one cluster (A1451), we detect a mass substructure without an obvious luminous counterpart. The radial profile of the shear of the clusters was fitted using circular and elliptical isothermal distributions, which allowed the finding of a strong correlation between the orientation of the major axis of the matter distribution and the corresponding major axes of the brightest cluster galaxy light profiles. Estimates of how close to dynamical relaxation are these clusters were obtained through comparison of our weak-lensing mass measurements with the X-ray and velocity dispersion determinations available in the literature. We find that clusters with intracluster gas colder than 8 keV show good agreement between the different mass determinations, but clusters with gas hotter than 8 keV present weak-lensing masses smaller than those inferred by the other methods and therefore have been diagnosed to be out of equilibrium. These clusters are A1451, A2163, and A2744, all of which have hints of substructure. A2744 presents the largest discrepancy between its X-ray, velocity dispersion, and weak-lensing mass determinations, which can be interpreted as being due to the interaction between the two kinematic components along the line of sight found by Girardi & Mezzeti.

Abstract Copyright:

Journal keyword(s): Cosmology: Observations - Cosmology: Dark Matter - Galaxies: Clusters: General - Galaxies: Clusters: Individual: Alphanumeric: A2744 - Galaxies: Clusters: Individual: Alphanumeric: A1451 - Galaxies: Clusters: Individual: Alphanumeric: A2163 - Cosmology: Gravitational Lensing

Simbad objects: 24

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Number of rows : 24
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 2744 ClG 00 14 20.03 -30 23 17.8           ~ 606 0
2 ACO 22 ClG 00 20 34.8 -25 41 51           ~ 96 0
3 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 816 0
4 ACO 2811 ClG 00 42 08.82 -28 32 08.8           ~ 58 0
5 ACO 1437 ClG 12 00 24.5 +03 19 52           ~ 67 0
6 ACO 1451 ClG 12 03 16.0 -21 30 42           ~ 40 0
7 ACO 1553 ClG 12 30 48.000 +10 33 21.60           ~ 70 0
8 ACO 1650 ClG 12 58 36.76 -01 43 34.2           ~ 278 0
9 ACO 1651 ClG 12 59 22.43 -04 11 47.1           ~ 277 0
10 ACO 1664 ClG 13 03 42.4 -24 14 44           ~ 116 0
11 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 881 0
12 ACO 2104 ClG 15 40 06.8 -03 17 39           ~ 103 0
13 ACO 2163 ClG 16 15 34.1 -06 07 26           ~ 532 0
14 ACO 2204 ClG 16 32 45.7 +05 34 43           ~ 408 0
15 ACO 3695 ClG 20 34 47.7 -35 49 39           ~ 80 2
16 ACO 3739 ClG 21 04 15.1 -41 23 03           ~ 29 0
17 ACO 2345 ClG 21 27 09.80 -12 09 58.8           ~ 117 1
18 ACO 2384 ClG 21 52 19.5463 -19 36 46.509           ~ 102 0
19 ACO 2426 ClG 22 14 27.3 -10 22 05           ~ 69 0
20 ACO 3856 ClG 22 18 45.2 -38 53 57           ~ 71 2
21 ACO 3888 ClG 22 34 23.0 -37 43 29           ~ 129 1
22 ACO 3984 ClG 23 15 46.0 -37 47 46           ~ 28 0
23 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 506 0
24 ACO 4010 ClG 23 31 10.3 -36 30 26           ~ 55 0

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2021.08.03-22:26:23

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