2001ApJ...552....2G

Query : 2001ApJ...552....2G

2001ApJ...552....2G - Astrophys. J., 552, 2-14 (2001/May-1)

Galaxy cluster gas mass fractions from Sunyaev-Zeldovich effect measurements: constraints on ΩM.

GREGO L., CARLSTROM J.E., REESE E.D., HOLDER G.P., HOLZAPFEL W.L., JOY M.K., MOHR J.J. and PATEL S.

Abstract (from CDS):

Using sensitive centimeter-wave receivers mounted on the Owens Valley Radio Observatory and Berkeley-Illinois-Maryland-Association millimeter arrays, we have obtained interferometric measurements of the Sunyaev-Zeldovich (SZ) effect toward massive galaxy clusters. We use the SZ data to determine the pressure distribution of the cluster gas and, in combination with published X-ray temperatures, to infer the gas mass and total gravitational mass of 18 clusters. The gas mass fraction, fg, is calculated for each cluster and is extrapolated to the fiducial radius r500 using the results of numerical simulations. The mean fg within r500 is 0.081+0.009–0.011 h–1100 (statistical uncertainty at 68% confidence level, assuming ΩM=0.3, ΩΛ=0.7). We discuss possible sources of systematic errors in the mean fg measurement.

We derive an upper limit for ΩM from this sample under the assumption that the mass composition of clusters within r500 reflects the universal mass composition: ΩMh≤ΩB/fg. The gas mass fractions depend on cosmology through the angular diameter distance and the r500 correction factors. For a flat universe (ΩΛ≡1-ΩM) and h=0.7, we find the measured gas mass fractions are consistent with ΩM<0.40, at 68% confidence. Including estimates of the baryons contained in galaxies and the baryons which failed to become bound during the cluster formation process, we find ΩM∼0.25.


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Journal keyword(s): Cosmology: Cosmic Microwave Background - Cosmology: Observations - Galaxies: Clusters: General - Techniques: Interferometric

Simbad objects: 23

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Number of rows : 23
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 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 517 0
2 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 825 0
3 ACO 478 ClG 04 13 24.8 +10 27 52           ~ 522 0
4 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 368 0
5 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 275 0
6 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 457 0
7 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 277 0
8 ZwCl 0847+3617 ClG 08 50 12.0 +36 03 36           ~ 75 0
9 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 458 0
10 ClG 1137+66 ClG 11 40 23.0 +66 08 16     21.0     ~ 141 0
11 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
12 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
13 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 370 0
14 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 727 1
15 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
16 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 140 0
17 LEDA 1900245 Bla 15 32 53.780 +30 20 59.41   19.1   15.7 17.819 ~ 155 1
18 ClG J1532+3021 ClG 15 32 53.8 +30 21 00           ~ 122 0
19 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
20 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
21 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
22 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 370 0
23 ClG 2053-04 ClG 20 56 21.2 -04 37 46   21.0       ~ 168 0

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