2004ApJ...601..610V

Query : 2004ApJ...601..610V

2004ApJ...601..610V - Astrophys. J., 601, 610-620 (2004/February-1)

Constraining amplitude and slope of the mass fluctuation spectrum using a cluster baryon mass function.

VOEVODKIN A. and VIKHLININ A.

Abstract (from CDS):

We derive the baryon mass function for a complete sample of low-redshift clusters and argue that it is an excellent proxy for the total mass function if the ratio fb=Mb/Mtotin all clusters is close to its universal value, Ωb/ΩM. Under this assumption, the baryon mass function can be used to constrain the amplitude and slope of the density fluctuation power spectrum on cluster scales. This method does not use observational determinations of the total mass and thus bypasses major uncertainties in the traditional analyses based on the X-ray temperature function. However, it is sensitive to possible systematic variations of the baryon fraction as a function of cluster mass. Adapting a weak dependence fbM, suggested by observations and numerical simulations by Bialek et al., we derive σ8=0.72±0.04 and the shape parameter ΩMh=0.13±0.07, in good agreement with a number of independent methods. We discuss the sensitivity of these values to other cosmological parameters and to different assumptions about variations in fb.

Abstract Copyright: ∼

Journal keyword(s): Cosmology: Cosmological Parameters - Galaxies: Clusters: General - Surveys - X-Rays: Galaxies: Clusters

CDS comments: Table 1 : Objects with truncated designation are : 2A 0335+096 and EXO 0422-086

Simbad objects: 52

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Number of rows : 52
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 NAME NGC 507 Group GrG 01 23 39.91 +33 15 21.8           ~ 82 0
4 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 727 1
5 ACO 400 ClG 02 57 37.4 +06 00 45           ~ 408 3
6 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 420 0
7 ACO 401 ClG 02 58 50.3 +13 34 07           ~ 592 0
8 ACO 3112 ClG 03 17 52.9 -44 15 06           ~ 329 1
9 ZwCl 0335+0956 ClG 03 38 35.3 +09 57 54           ~ 402 1
10 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
11 ACO 478 ClG 04 13 24.8 +10 27 52           ~ 522 0
12 NAME NGC 1550 Group ClG 04 19 37.93 +02 24 34.1           ~ 45 0
13 ClG 0422-09 ClG 04 25 51.02 -08 33 38.5           ~ 97 0
14 ACO 3266 ClG 04 31 26.4 -61 25 17           ~ 447 0
15 ACO 496 ClG 04 33 40.8 -13 14 34           ~ 728 2
16 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 334 0
17 ACO 3391 ClG 06 26 15.4 -53 40 52           ~ 222 1
18 ACO 3395 ClG 06 27 31.1 -54 23 58           ~ 229 0
19 ACO 576 ClG 07 21 24.1 +55 44 20           ~ 312 1
20 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
21 ACO 780 ClG 09 18 30 -12 15.7           ~ 469 0
22 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 905 1
23 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
24 NAME NGC 4073 Group GrG 12 04 44.08 +01 48 40.9     13.53     ~ 292 0
25 ACO 3526 ClG 12 48 49.2 -41 18 17           ~ 1154 2
26 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 391 1
27 ACO 1651 ClG 12 59 27.3 -04 10 49           ~ 307 0
28 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
29 ACO 1736 ClG 13 26 52.1 -27 06 33           ~ 268 2
30 ACO 3558 ClG 13 28 03.2 -31 31 35           ~ 476 2
31 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 337 1
32 ACO 3571 ClG 13 47 32.4 -32 50 12           ~ 308 2
33 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
34 ACO 3581 ClG 14 07 29.8 -27 01 04           ~ 197 3
35 ACO 2029 ClG 15 10 54.2 +05 44 23           ~ 1020 0
36 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 756 1
37 ACT-CL J1521.8+0742 ClG 15 21 48.8 +07 43 41     15.13     ~ 326 0
38 ACO 2065 ClG 15 22 22.7 +27 44 20           ~ 398 0
39 ACO 2063 ClG 15 23 01.8 +08 38 22           ~ 414 2
40 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
41 ACO 2147 ClG 16 02 11.96 +15 55 11.5           ~ 416 0
42 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 586 0
43 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
44 ACO 2204 ClG 16 32 47.7 +05 34 18           ~ 457 0
45 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
46 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
47 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 272 1
48 ACO 2589 ClG 23 24 00.5 +16 49 29           ~ 327 1
49 ACO 2634 ClG 23 38 18.4 +27 01 37           ~ 515 2
50 ACO 2657 ClG 23 44 51.0 +09 08 40           ~ 280 3
51 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 349 3
52 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 400 1

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