# 2003A&A...398..879E

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 Query : 2003A&A...398..879E

2003A&A...398..879E - Astronomy and Astrophysics, volume 398, 879-890 (2003/2-2)

Constraining the cosmological parameters with the gas mass fraction in local and z>0.7 galaxy clusters.

ETTORI S., TOZZI P. and ROSATI P.

Abstract (from CDS):

We present a study of the baryonic fraction in galaxy clusters aimed at constraining the cosmological parameters Ωm, ΩΛ and the ratio between the pressure and density of the dark'' energy, w. We use results on the gravitating mass profiles of a sample of nearby galaxy clusters observed with the BeppoSAX X-ray satellite (Ettori et al., astro-ph/0202357) to set constraints on the dynamical estimate of Ωm. We then analyze Chandra observations of a sample of eight distant clusters with redshift in the range 0.72 and 1.27 and evaluate the geometrical limits on the cosmological parameters Ωm, ΩΛ and w by requiring that the gas fraction remains constant with respect to the look-back time. By combining these two independent probability distributions and using a priori distributions on both Ωb and H0 peaked around primordial nucleosynthesis and HST-Key Project results respectively, we obtain that, at 95.4 percent level of confidence, (i) w < -0.49, (ii) Ωm = 0.34+0.11–0.05, ΩΛ = 1.30+0.44–1.09 for w=-1 (corresponding to the case for a cosmological constant), and (iii) Ωm = 1-ΩΛ = 0.33+0.07–0.05 for a flat Universe. These results are in excellent agreement with the cosmic concordance scenario which combines constraints from the power spectrum of the Cosmic Microwave Background, the galaxy and cluster distribution, the evolution of the X-ray properties of galaxy clusters and the magnitude-redshift relation for distant type Ia supernovae. By combining our results with the latter method we further constrain ΩΛ=0.94+0.30–0.30 and w←0.89 at the 2σ level.

Journal keyword(s): galaxies: clusters: general - galaxies: fundamental parameters - galaxies: intergalactic medium - X-ray: galaxies - cosmology: observations - cosmology: dark matter

CDS comments: In table 2, NEP J1716.9+6708 = RX J1716.6+6708.

Full paper

 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 - 2023
#notes
1 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 867 0
2 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2162 1
3 ClG 0745-19 ClG 07 47 31.3 -19 17 40           ~ 368 0
4 2MASX J07473129-1917403 BiC 07 47 31.3247085936 -19 17 40.013334276   19.60       ~ 403 1
5 ClG J0849+4452 ClG 08 48 56.3 +44 52 16           ~ 106 1
6 ClG J0910+5422 ClG 09 10 44.9 +54 22 09           ~ 90 0
7 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 452 0
8 ClG J1113-2615 ClG 11 13 05.7 -26 15 36           ~ 35 0
9 ClG 1137+66 ClG 11 40 23.3 +66 09 01     21.0     ~ 137 0
10 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 303 1
11 ACO 3571 ClG 13 47 28.9 -32 51 57           ~ 276 2
12 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1225 0
13 ClG J1350+6007 ClG 13 50 48.55 +60 07 06.7           ~ 44 0
14 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 916 0
15 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 737 0
16 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1146 1
17 ClG J1716+6708 ClG 17 16 49.6 +67 08 30           ~ 134 0
18 ClG J2302+0844 ClG 23 02 48.1 +08 43 50           ~ 41 0

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2023.04.01-19:53:33