2008A&A...487..431C


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.23CET00:25:53

2008A&A...487..431C - Astronomy and Astrophysics, volume 487, 431-443 (2008/8-4)

Galaxy-cluster gas-density distributions of the representative XMM-Newton cluster structure survey (REXCESS).

CROSTON J.H., PRATT G.W., BOEHRINGER H., ARNAUD M., POINTECOUTEAU E., PONMAN T.J., SANDERSON A.J.R., TEMPLE R.F., BOWER R.G. and DONAHUE M.

Abstract (from CDS):

We present a study of the structural and scaling properties of the gas distributions in the intracluster medium (ICM) of 31 nearby (z<0.2) clusters observed with XMM-Newton, which together comprise the Representative XMM-Newton Cluster Structure Survey (REXCESS). In contrast to previous studies, this sample is unbiased with respect to X-ray surface brightness and cluster dynamical state, and it fully samples the cluster X-ray luminosity function. The clusters cover a temperature range of 2.0-8.5keV and possess a variety of morphologies. The sampling strategy allows us to compare clusters with a wide range of central cooling times on an equal footing. We applied a recently developed technique for the deprojection and PSF-deconvolution of X-ray surface brightness profiles to obtain non-parametric gas-density profiles out to distances ranging between 0.8R500 and 1.5R500. We scaled the gas density distributions to allow for the systems' differing masses and redshifts. The central gas densities differ greatly from system to system, with no clear correlation with system temperature. At intermediate radii (∼0.3 R500), the scaled density profiles show much less scatter, with a clear dependence on system temperature. We find that the density at this radius scales proportionally to the square root of temperature, consistent with the presence of an entropy excess as suggested in previous literature. However, at larger scaled radii this dependence becomes weaker: clusters with kT>3keV scale self-similarly, with no temperature dependence of gas-density normalisation. The REXCESS sample allows us to investigate the correlations between cluster properties and dynamical state. We find no evidence of correlations between cluster dynamical state and either the gas density slope in the inner regions or temperature, but do find some evidence of a correlation between dynamical state and outer gas density slope. We also find a weak correlation between dynamical state and both central gas normalisation and inner cooling times, but this is only significant at the 10% level. We conclude that, for the X-ray cluster population as a whole, both the central gas properties and the angle-averaged, large-scale gas properties are linked to the cluster dynamical state. We also investigate the central cooling times of the clusters. While the cooling times span a wide range, we find no evidence of a significant bimodality in the distributions of central density, density gradient, or cooling time. Finally, we present the gas mass-temperature relation for the REXCESS sample, finding that h(z)Mgas∝T1.99±0.11, which is consistent with the expectation of self-similar scaling modified by the presence of an entropy excess in the inner regions of the cluster and consistent with earlier work on relaxed cluster samples. We measure a logarithmic intrinsic scatter in this relation of ∼10%, which should be a good measure of the intrinsic scatter in the Mgas-T relation for the cluster population as a whole.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: intergalactic medium - cosmology: large-scale structure of Universe

Simbad objects: 35

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Number of rows : 35

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 2700 ClG 00 03 49.7 +02 03 59           ~ 78 0
2 ACO 2721 ClG 00 06 14.5 -34 42 51           ~ 81 0
3 ACO 22 ClG 00 20 34.8 -25 41 51           ~ 93 0
4 ACO S 84 ClG 00 49 23.2 -29 31 33           ~ 74 0
5 SPT-CL J0145-5301 CGG 01 45 03.60 -53 01 23.4           ~ 38 0
6 ACO 2984 ClG 02 11 27 -40 16.9           ~ 45 0
7 BAX 036.2925-29.4731 ClG 02 25 08.6 -29 28 34           ~ 29 0
8 ACO S 384 ClG 03 45 45.0 -41 10 42           ~ 31 0
9 ACO 3364 ClG 05 47 36.1753 -31 52 22.695           ~ 60 0
10 ACO 3378 ClG 06 05 52.6923 -35 18 32.801           ~ 66 1
11 RXC J0616.8-4748 ClG 06 16 56.8320 -47 47 26.473           ~ 26 0
12 ACO 3404 ClG 06 45 29.50 -54 13 37.0           ~ 73 0
13 ACO 653 ClG 08 21 50.6 +01 11 49           ~ 33 0
14 ACO 901 ClG 09 55 56.9256 -10 01 46.519           ~ 97 1
15 NAME ACO 901-902 Supercluster SCG 09 56 -10.0           ~ 111 1
16 ACO 902 ClG 09 56 33.600 -10 09 13.10           ~ 57 1
17 ACO 907 ClG 09 58 21.84 -11 03 47.5           ~ 112 0
18 ACO 1084 ClG 10 44 37.1 -07 04 47           ~ 67 0
19 ACO 1348 ClG 11 41 24.0 -12 16 00           ~ 58 0
20 ACO S 700 ClG 12 36 40 -33 54.5           ~ 27 0
21 ACO 1663 ClG 13 02 52.55 -02 31 04.0           ~ 90 0
22 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1011 0
23 ACO 2050 ClG 15 16 21.6 +00 05 59           ~ 86 0
24 ACO 2051 ClG 15 16 53.8 -01 05 06           ~ 46 0
25 2MAXI J2014-244 ClG 20 14 49.7 -24 30 30           ~ 55 0
26 ACO S 868 ClG 20 23 00 -20 56.3           ~ 28 1
27 ACO 2328 ClG 20 48 13.9 -17 48 53           ~ 64 0
28 ACO 3771 ClG 21 29 47.7233 -50 46 37.428           ~ 39 0
29 ACO 3814 ClG 21 49 07.24 -30 42 06.4           ~ 49 0
30 RXC J2152.2-1942 ClG 21 52 14.2 -19 42 20           ~ 9 0
31 ACO 2399 ClG 21 57 27.64 -07 48 12.9           ~ 157 0
32 ACO 3854 ClG 22 17 45.72 -35 43 31.4           ~ 56 0
33 ACO 3856 ClG 22 18 45.2 -38 53 57           ~ 68 2
34 ACO 3888 ClG 22 34 23.0 -37 43 29           ~ 122 1
35 ACO 3992 ClG 23 19 41.8 -73 13 51           ~ 30 0

    Equat.    Gal    SGal    Ecl

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2020.02.23-00:25:53

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