2006ApJ...640..691V


Query : 2006ApJ...640..691V

2006ApJ...640..691V - Astrophys. J., 640, 691-709 (2006/April-1)

Chandra sample of nearby relaxed galaxy clusters: mass, gas fraction, and mass-temperature relation.

VIKHLININ A., KRAVTSOV A., FORMAN W., JONES C., MARKEVITCH M., MURRAY S.S. and VAN SPEYBROECK L.

Abstract (from CDS):

We present gas and total mass profiles for 13 low-redshift, relaxed clusters spanning a temperature range 0.7-9 keV, derived from all available Chandra data of sufficient quality. In all clusters, gas-temperature profiles are measured to large radii (Vikhlinin et al.) so that direct hydrostatic mass estimates are possible to nearly r500or beyond. The gas density was accurately traced to larger radii; its profile is not described well by a beta model, showing continuous steepening with radius. The derived ρtot profiles and their scaling with mass generally follow the Navarro-Frenk-White model with concentration expected for dark matter halos in ΛCDM cosmology. However, in three cool clusters, we detect a central mass component in excess of the Navarro-Frenk-White profile, apparently associated with their cD galaxies. In the inner region (r<0.1r500), the gas density and temperature profiles exhibit significant scatter and trends with mass, but they become nearly self-similar at larger radii. Correspondingly, we find that the slope of the mass-temperature relation for these relaxed clusters is in good agreement with the simple self-similar behavior, M500∝Tα, where α=(1.5-1.6)±0.1, if the gas temperatures are measured excluding the central cool cores. The normalization of this M-T relation is significantly, by ~30%, higher than most previous X-ray determinations. We derive accurate gas mass fraction profiles, which show an increase with both radius and cluster mass. The enclosed fgasprofiles within r2500≃0.4r500have not yet reached any asymptotic value and are still far (by a factor of 1.5-2) from the universal baryon fraction according to the cosmic microwave background (CMB) observations. The fgastrends become weaker and its values closer to universal at larger radii, in particular, in spherical shells r2500<r<r500.

Abstract Copyright:

Journal keyword(s): Cosmology: Observations - Cosmology: Dark Matter - Galaxies: Clusters: General - X-Rays: Galaxies: Clusters

Errata: erratum vol. 799, art. 113 (2015)

Simbad objects: 13

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Number of rows : 13
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 133 ClG 01 02 39.0 -21 57 15           ~ 346 1
2 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 662 1
3 ACO 383 ClG 02 48 06.9 -03 29 32           ~ 312 0
4 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 478 0
5 ACO 907 ClG 09 58 21.84 -11 03 47.5           ~ 117 0
6 NAME NGC 3411 Group GrG 10 50 26.9 -12 50 26           ~ 46 0
7 ACO 1413 ClG 11 55 18.0 +23 24 19           ~ 390 0
8 ClG J1159+5531 ClG 11 59 51.1 +55 31 56     15.64     ~ 88 1
9 NAME NGC 4073 Group GrG 12 04 21.7 +01 50 19     13.53     ~ 250 0
10 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1187 0
11 ACO 1991 ClG 14 54 30.2 +18 37 51           ~ 314 1
12 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 880 0
13 ACO 2390 ClG 21 53 34.6 +17 40 11           ~ 641 2

    Equat.    Gal    SGal    Ecl

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2021.07.27-20:17:56

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