2007MNRAS.377..843W

Query : 2007MNRAS.377..843W

2007MNRAS.377..843W - Mon. Not. R. Astron. Soc., 377, 843-854 (2007/May-2)

The importance of interloper removal in galaxy clusters: saving more objects for the Jeans analysis.

WOJTAK R. and LOKAS E.L.

Abstract (from CDS):

We study the effect of contamination by interlopers in kinematic samples of galaxy clusters. We demonstrate that without the proper removal of interlopers the inferred parameters of the mass distribution in the cluster are strongly biased towards higher mass and lower concentration. The interlopers are removed using two procedures previously shown to work most efficiently on simulated data. One is based on using the virial mass estimator and calculating the maximum velocity available to cluster members and the other relies on the ratio of the virial and projected mass estimators. We illustrate the performance of the methods in detail using the example of A576, a cluster with a strong uniform background contamination, and compare the case of A576 to 15 other clusters with different degree of contamination. We model the velocity dispersion and kurtosis profiles obtained for the cleaned data samples of these clusters solving the Jeans equations to estimate the mass, concentration and anisotropy parameter. We present the mass-concentration relation for the total sample of 22 clusters.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: A576 - galaxies: kinematics and dynamics - dark matter

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
2 ACO 119 ClG 00 56 08.57 -01 12 00.8           ~ 577 2
3 ACO 401 ClG 02 58 50.3 +13 34 07           ~ 592 0
4 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
5 ACO 576 ClG 07 21 24.1 +55 44 20           ~ 312 1
6 ACO 1651 ClG 12 59 27.3 -04 10 49           ~ 307 0
7 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
8 ACO 3571 ClG 13 47 32.4 -32 50 12           ~ 308 2
9 NAME Hercules Supercluster SCG 15 47 +18.2           ~ 166 1
10 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
11 ACO 2147 ClG 16 02 11.96 +15 55 11.5           ~ 416 0
12 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
13 ACO 3921 ClG 22 49 59.0 -64 25 48           ~ 165 1
14 ACO 2593 ClG 23 24 27.15 +14 33 40.2           ~ 231 0
15 ACO 2634 ClG 23 38 18.4 +27 01 37           ~ 515 2
16 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 349 3
17 ACO 2670 ClG 23 54 10.51 -10 23 06.8           ~ 364 0
18 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 400 1

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