1999ApJ...517..627M

Query : 1999ApJ...517..627M

1999ApJ...517..627M - Astrophys. J., 517, 627-649 (1999/June-1)

Properties of the intracluster medium in an ensemble of nearby galaxy clusters.

MOHR J.J., MATHIESEN B. and EVRARD A.E.

Abstract (from CDS):

We present a systematic analysis of the intracluster medium (ICM) in an X-ray flux limited sample of 45 galaxy clusters. Using archival ROSAT Position-Sensitive Proportional Counter (PSPC) data and published ICM temperatures, we present best-fit double and single β model profiles, and extract ICM central densities and radial distributions. We use the data and an ensemble of numerical cluster simulations to quantify sources of uncertainty for all reported parameters. We examine the ensemble properties within the context of models of structure formation and feedback from galactic winds. We present best-fit ICM mass-temperature MICM-<TX> relations for MICM calculated within r500 and 1 h–150 Mpc. These relations exhibit small scatter (17%), providing evidence of regularity in large, X-ray flux limited cluster ensembles. Interestingly, the slope of the MICM-<TX> relation (at limiting radius r500) is steeper than the self-similar expectation by 4.3 σ. We show that there is a mild dependence of ICM mass fraction fICM on <TX>; the clusters with ICM temperatures below 5 keV have a mean ICM mass fraction <fICM≥0.160±0.008, which is significantly lower than that of the hotter clusters <fICM≥0.212±0.006 (90% confidence intervals). In apparent contradiction with previously published analyses, our large, X-ray flux limited cluster sample provides no evidence for a more extended radial ICM distribution in low-<TX> clusters down to the sample limit of 2.4 keV. By analyzing simulated clusters we find that density variations enhance the cluster X-ray emission and cause MICM and fICM to be overestimated by ∼12%. Additionally, we use the simulations to estimate an fICM depletion factor at r500. We use the bias corrected mean fICM within the hotter cluster subsample as a lower limit on the cluster baryon fraction. In combination with nucleosynthesis constraints this measure provides a firm upper limit on the cosmological density parameter for clustered matter ΩM≤(0.36±0.01) h–1/250.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Clusters: General - Galaxies: Intergalactic Medium - X-Rays: Galaxies

Simbad objects: 46

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Number of rows : 46
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 262 ClG 01 52 50.4 +36 08 46           ~ 727 1
4 2A 0251+413 ClG 02 54 26.6 +41 33 25           ~ 328 1
5 ACO 401 ClG 02 58 50.3 +13 34 07           ~ 592 0
6 ACO 3112 ClG 03 17 52.9 -44 15 06           ~ 329 1
7 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
8 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
9 ACO 478 ClG 04 13 24.8 +10 27 52           ~ 522 0
10 ACO 3266 ClG 04 31 26.4 -61 25 17           ~ 447 0
11 ACO 496 ClG 04 33 40.8 -13 14 34           ~ 728 2
12 ACO 3391 ClG 06 26 15.4 -53 40 52           ~ 222 1
13 PKS 0745-19 rG 07 47 31.3247085936 -19 17 40.013334276   19.60       ~ 422 1
14 ClG 0745-1910 ClG 07 47 32.4 -19 18 23           ~ 378 0
15 ACO 644 ClG 08 17 26.1 -07 31 13           ~ 241 0
16 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
17 ACO 780 ClG 09 18 30 -12 15.7           ~ 469 0
18 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 905 1
19 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
20 MKW 3 ClG 11 48 29 -03 10.7     14.88     ~ 52 1
21 ACO 3526 ClG 12 48 49.2 -41 18 17           ~ 1154 2
22 ACO 3532 ClG 12 57 19.2 -30 22 13           ~ 185 2
23 ACO 1651 ClG 12 59 27.3 -04 10 49           ~ 307 0
24 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
25 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
26 ACO 3558 ClG 13 28 03.2 -31 31 35           ~ 476 2
27 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 337 1
28 ACO 3571 ClG 13 47 32.4 -32 50 12           ~ 308 2
29 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
30 ACO 2029 ClG 15 10 54.2 +05 44 23           ~ 1020 0
31 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 756 1
32 ACO 2063 ClG 15 23 01.8 +08 38 22           ~ 414 2
33 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
34 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
35 ACO 2204 ClG 16 32 47.7 +05 34 18           ~ 457 0
36 BAX 249.5848-64.5165 ClG 16 38 13.2 -64 21 21           ~ 123 0
37 ACO 2244 ClG 17 02 40.33 +34 02 58.7           ~ 301 0
38 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
39 BAX 258.1082-23.3759 ClG 17 12 26.3 -23 21 38           ~ 303 0
40 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
41 ACO 2319 ClG 19 21 14.0 +43 56 57           ~ 495 1
42 BAX 299.8681+40.7339 ClG 19 59 30.3 +40 44 11           ~ 143 0
43 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
44 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 572 0
45 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 349 3
46 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 400 1

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