2002A&A...389....1A

Query : 2002A&A...389....1A

2002A&A...389....1A - Astronomy and Astrophysics, volume 3891-18 (2002/7-1)

The X-ray surface brightness profiles of hot galaxy clusters up to z ∼ 0.8: Evidence for self-similarity and constraints on Ω0.

ARNAUD M., AGHANIM N. and NEUMANN D.M.

Abstract (from CDS):

We study the surface brightness profiles of a sample of 25 distant (0.3<z<0.83) hot (kT>3.5keV) clusters, observed with ROSAT, with published temperatures from ASCA. For both open and flat cosmological models, the derived emission measure profiles are scaled according to the self-similar model of cluster formation. We use the standard scaling relations of cluster properties with redshift and temperature, with the empirical slope of the Mgas-T relation derived by Neumann & Arnaud (2001A&A...373L..33N). Using a χ2 test, we perform a quantitative comparison of the scaled emission measure profiles of distant clusters with a local reference profile derived from the sample of 15 hot nearby clusters compiled by Neumann & Arnaud (1999ApJ...520...87N), which were found to obey self-similarity. This comparison allows us to both check the validity of the self-similar model across the redshift range 0.04-0.8, and to constrain the cosmological parameters. For a low-density flat universe, the scaled distant cluster data were found to be consistent, both in shape and normalisation, with the local reference profile. It indicates that hot clusters constitute a homologous family up to high redshifts, and gives support to the standard picture of structure formation for the dark matter component. Because of the intrinsic regularity in the hot cluster population, the scaled profiles can be used as distance indicators, the correct cosmology being the one for which the various profiles at different redshifts coincide. The intrinsic limitations of the method, in particular possible systematic errors and biases related to the model uncertainties, are discussed. Using the standard evolution model, the present data allow us to put a tight constraint on Ω0 for a flat Universe: Ω0=0.40+0.15–0.12 at 90% confidence level (statistical errors only). The critical model (Ω0=1) was excluded at the 98% confidence level. Consistently, the observed evolution of the normalisation of the LX-T relation was found to comply with the self-similar model for Ω0=0.4, Λ=0.6. The constraint derived on Ω0 is in remarkable agreement with the constraint obtained from luminosity distances to SNI or from combined analysis of the power spectrum of the 2dF galaxy redshift Survey and the Cosmic Microwave Background anisotropies.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: general - galaxies: intergalactic medium - Cosmology: observations - Cosmology: dark matter - X-rays: galaxies

CDS comments: Table 1 : RX J1716.4+6708 is a misprint for RX J1716.6+6708.

Simbad objects: 30

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Number of rows : 30
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 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
2 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 517 0
3 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 825 0
4 ClG 0303+1658 ClG 03 05 31.6 +17 10 02     20.13     ~ 92 0
5 ACO S 400 ClG 03 55 33.29 -36 34 18.5           ~ 40 0
6 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 368 0
7 ACO S 506 ClG 05 01 04.4 -24 24 41           ~ 60 0
8 ClG 0811+63 ClG 08 16 04.0 +62 52 19     18.5     ~ 23 0
9 ACO 851 ClG 09 43 01.2 +46 59 54   18.9       ~ 334 0
10 ClG 1008-12 ClG 10 10 34.1 -12 39 48     18.0     ~ 155 0
11 ACO 959 ClG 10 17 35.0 +59 33 28           ~ 76 0
12 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 458 0
13 ACO 1300 ClG 11 32 00.7 -19 53 34           ~ 168 0
14 ClG 1137+66 ClG 11 40 23.0 +66 08 16     21.0     ~ 141 0
15 ClG 1147+11 ClG 11 49 52.6 +10 46 37     19.0     ~ 29 0
16 ClG 1224+20 ClG 12 27 14.9 +19 51 06   19.0       ~ 96 0
17 ClG 1241+17 ClG 12 44 02.6 +16 54 11     19.0     ~ 42 0
18 ACO 1722 ClG 13 20 08.3 +70 04 33           ~ 63 0
19 ClG J1347-1145 ClG 13 47 30.5 -11 45 07           ~ 577 0
20 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 370 0
21 3C 295 Sy1 14 11 20.6 +52 12 09   22.34 20.80 18.54   ~ 1021 4
22 ClG 1426+01 ClG 14 28 58.9 +01 43 59     19.0     ~ 34 0
23 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 140 0
24 ClG J1514+3636 ClG 15 14 22.0 +36 36 22     19.0     ~ 136 0
25 ClG 1621+26 ClG 16 23 35.7 +26 33 50           ~ 145 0
26 ClG J1716+6708 ClG 17 16 49.6 +67 08 30           ~ 137 0
27 ClG 2053-04 ClG 20 56 21.2 -04 37 46   21.0       ~ 168 0
28 ClG 2137-2353 ClG 21 40 12.8 -23 39 27     18.5     ~ 390 0
29 ClG 2244.6-0222 ClG 22 47 12.2 -02 05 37           ~ 128 0
30 ACO S 1077 ClG 22 58 52.34 -34 46 54.6           ~ 198 0

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