2011ApJ...736...52H


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST14:28:56

2011ApJ...736...52H - Astrophys. J., 736, 52 (2011/July-3)

A detailed statistical analysis of the mass profiles of galaxy clusters.

HOST O. and HANSEN S.H.

Abstract (from CDS):

The distribution of mass in the halos of galaxies and galaxy clusters has been probed observationally, theoretically, and in numerical simulations, yet there is still confusion about which of several suggested parameterized models is the better representation, and whether these models are universal. We use the temperature and density profiles of the intracluster medium as measured by X-ray observations of 11 relaxed galaxy clusters to investigate mass models for the halo using a thorough Bayesian statistical analysis. We make careful comparisons between two- and three-parameter models, including the issue of a universal third parameter. We find that, of the two-parameter models, the Navarro-Frenk-White (NFW) is the best representation, but we also find moderate statistical evidence that a generalized three-parameter NFW model with a freely varying inner slope is preferred, despite penalizing against the extra degree of freedom. There is a strong indication that this inner slope needs to be determined for each cluster individually, i.e., some clusters have central cores and others have steep cusps. The mass-concentration relation of our sample is in reasonable agreement with predictions based on numerical simulations.

Abstract Copyright:

Journal keyword(s): dark matter - galaxies: clusters: general - methods: statistical - X-rays: galaxies: clusters

Simbad objects: 12

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Number of rows : 12

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 2E 0122.9+0129 ClG 01 25 31.3 +01 45 33           ~ 19 0
2 NGC 533 GiG 01 25 31.432 +01 45 33.57   13.1 14.11     ~ 209 0
3 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 660 1
4 ZwCl 0335+0956 ClG 03 38 35.3 +09 57 54           ~ 353 1
5 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 664 2
6 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1181 0
7 ACO 1837 ClG 14 01 36.2 -11 07 48           ~ 100 0
8 ACO 2052 ClG 15 16 45.5 +07 00 01           ~ 689 1
9 NAME NGC 5920 Group ClG 15 21 50.7 +07 42 18     15.13     ~ 292 0
10 BAX 233.1222+04.6817 ClG 15 32 29.3 +04 40 54     15.13     ~ 58 0
11 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 238 1
12 ACO 4059 ClG 23 56 40.7 -34 40 18           ~ 358 1

    Equat.    Gal    SGal    Ecl

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2021.04.19-14:28:56

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