CDS

2009A&A...501...61E

Query : 2009A&A...501...61E

2009A&A...501...61E - Astronomy and Astrophysics, volume 501, 61-73 (2009/7-1)

The cluster gas mass fraction as a cosmological probe: a revised study.

ETTORI S., MORANDI A., TOZZI P., BALESTRA I., BORGANI S., ROSATI P., LOVISARI L. and TERENZIANI F.

Abstract (from CDS):

We present the analysis of the baryonic content of 52 X-ray luminous galaxy clusters observed with Chandra in the redshift range 0.3-1.273. Our study aims at resolving the gas mass fraction in these objects to place constraints on the cosmological parameters Ωm, ΩΛ and the ratio between the pressure and density of the dark energy, w. We deproject the X-ray surface brightness profiles to recover the gas mass profiles and fit a single thermal component to the spectrum extracted from a region around the cluster that maximizes the signal-to-noise ratios in the observation. The measured values of the gas temperature are used to evaluate the temperature profile with a given functional form and to estimate the total gravitating mass in combination with the gas density profiles. These measured quantities are then used to statistically estimate the gas fraction and the fraction of mass in stars. By assuming that galaxy clusters are representative of the cosmic baryon budget, the distribution of the cluster baryon fraction in the hottest (Tgas>4keV) systems as a function of redshift is used to constrain the cosmological parameters. We discuss how our constraints are affected by several systematic effects, namely the isothermality, the assumed baryon fraction in stars, the depletion parameter and the sample selection. By using only the cluster baryon fraction as a proxy for the cosmological parameters, we obtain that Ωm is very well constrained at the value of 0.35 with a relative statistical uncertainty of 11% (1σ level; w=-1) and a further systematic error of about (-6,+7)%. On the other hand, constraints on ΩΛ (without the prior of flat geometry) and w (using the prior of flat geometry) are definitely weaker due to the presence of greater statistical and systematic uncertainties (of the order of 40 per cent on ΩΛ and greater than 50 per cent on w). If the WMAP 5-year best-fit results are assumed to fix the cosmological parameters, we limit the contributions expected from non-thermal pressure support and ICM clumpiness to be lower than about 10 per cent, also leaving room to accommodate baryons not accounted for either in the X-ray emitting plasma or in stars of the order of 18 per cent of the total cluster baryon budget. This value is lowered to zero for a no-flat Universe with ΩΛ>0.7.

Abstract Copyright: ∼

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

Simbad objects: 60

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Number of rows : 60
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 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 491 0
2 ZwCl 0024+1652 ClG 00 26 36.0 +17 08 36     18.35     ~ 629 1
3 BAX 006.9575+26.2739 ClG 00 27 45.90 +26 16 25.0           ~ 36 0
4 ACO 133 ClG 01 02 39.0 -21 57 15           ~ 355 1
5 ClG J0152-1358 ClG 01 52 41.3 -13 58 13           ~ 253 3
6 CDGS 21 ClG 01 59 49.4 -08 50 00           ~ 79 0
7 ACO 383 ClG 02 48 03.30 -03 31 43.4           ~ 345 0
8 ClG 0303+1658 ClG 03 05 31.6 +17 10 02     20.13     ~ 90 0
9 MCS J0308.9+2645 ClG 03 08 55.9 +26 45 38           ~ 41 0
10 MCS J0404.6+1109 ClG 04 04 37.4 +11 09 57           ~ 31 0
11 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 488 0
12 MCS J0417.5-1154 ClG 04 17 34.6 -11 54 32           ~ 76 0
13 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 345 0
14 ClG J0542-4100 ClG 05 42 49.9 -40 59 58           ~ 58 0
15 ClG J0647+7015 ClG 06 47 50.0 +70 14 55           ~ 140 0
16 ClG J0744+3927 ClG 07 44 52.5 +39 27 30           ~ 176 0
17 ClG J0848+4453 ClG 08 48 34.800 +44 53 41.90           ~ 123 1
18 ClG J0848+4456 ClG 08 48 46.9 +44 56 22           ~ 60 1
19 ClG J0849+4452 ClG 08 48 56.3 +44 52 16           ~ 106 1
20 ClG J0910+5422 ClG 09 10 44.9 +54 22 09           ~ 90 0
21 ClG J0956+4107 ClG 09 56 03.4 +41 07 14           ~ 41 0
22 ACO 907 ClG 09 58 21.84 -11 03 47.5           ~ 125 0
23 ClG 1008-12 ClG 10 10 34.1 -12 39 48     18.0     ~ 151 0
24 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 452 0
25 ClG J1113-2615 ClG 11 13 05.7 -26 15 36           ~ 35 0
26 SC 1120-12.0 ClG 11 20.0 -12 02           ~ 3 0
27 ClG J1120+2326 ClG 11 20 57.9 +23 26 41           ~ 40 0
28 MCS J1137.5+6624 ClG 11 37.5 +66 24           ~ 3 0
29 MCS J1149.5+2223 ClG 11 49 35.8 +22 23 55           ~ 412 0
30 ACO 1413 ClG 11 55 18.0 +23 24 19           ~ 412 0
31 MCS J1206.2-0847 ClG 12 06 12.2 -08 48 02           ~ 222 0
32 ClG J1221+4918 ClG 12 21 25.0 +49 18 07           ~ 58 0
33 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6377 0
34 ClG J1226+3332 ClG 12 26 57.7 +33 32 50           ~ 207 0
35 ClG J1252-2927 ClG 12 52 54.4 -29 27 17           ~ 155 0
36 ClG J1311-0311 ClG 13 11 01.7 -03 10 38           ~ 102 0
37 ClG J1317+2911 ClG 13 17 21.70 +29 11 18.1           ~ 30 0
38 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1220 0
39 ClG J1350+6007 ClG 13 50 48.55 +60 07 06.7           ~ 44 0
40 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 357 0
41 ClG J1415+3611 ClG 14 15 11.1 +36 12 03           ~ 75 1
42 ClG J1416+4446 ClG 14 16 28.1 +44 46 38           ~ 45 0
43 ClG J1419+5326 ClG 14 19 10.3 +53 26 08           ~ 21 0
44 ClG J1423+2404 ClG 14 23 47.7 +24 04 40           ~ 199 0
45 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 126 0
46 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 909 0
47 ClG J1524+0957 ClG 15 24 40.3 +09 57 35           ~ 59 0
48 ClG J1621+3810 ClG 16 21 25.5 +38 09 43           ~ 76 0
49 ClG 1621+26 ClG 16 23 35.7 +26 33 50           ~ 141 0
50 ClG J1641+4001 ClG 16 41 52.3 +40 01 29           ~ 38 0
51 2MASX J17022241+6109589 G 17 02 22.4202778680 +61 09 59.569528176   15.4       ~ 10 0
52 ClG J1716+6708 ClG 17 16 49.6 +67 08 30           ~ 134 0
53 ClG J1720+3536 ClG 17 20 16.8 +35 36 27           ~ 137 1
54 1RXS J182418.7+430954 ClG 18 24 19.0 +43 09 49           ~ 21 0
55 ClG 2053-04 ClG 20 56 21.2 -04 37 46   21.0       ~ 164 0
56 ClG J2129-0741 ClG 21 29 26.0 -07 41 28           ~ 158 0
57 ClG 2137-2353 ClG 21 40 12.8 -23 39 27     18.5     ~ 369 0
58 ACO 2390 ClG 21 53 34.6 +17 40 11           ~ 666 2
59 BAX 337.1433+20.6131 ClG 22 28 37.1 +20 36 31           ~ 112 0
60 ClG J2302+0844 ClG 23 02 48.1 +08 43 50           ~ 41 0

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2023.01.27-05:28:57

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