2006ApJ...648..176L

Query : 2006ApJ...648..176L

2006ApJ...648..176L - Astrophys. J., 648, 176-199 (2006/September-1)

The Sunyaev-Zel'dovich effect in a sample of 31 clusters: a comparison between the X-ray predicted and WMAP observed Cosmic Microwave Background temperature decrement.

LIEU R., MITTAZ J.P.D. and ZHANG S.-N.

Abstract (from CDS):

The WMAP Q-, V-, and W-band radial profiles of temperature deviation of the cosmic microwave background (CMB) were constructed for a sample of 31 randomly selected nearby clusters of galaxies in directions of Galactic latitude b>30°. The profiles were compared in detail with the expected CMB Sunyaev-Zel'dovich effect (SZE) caused by these clusters, with the hot gas properties of each cluster inferred observationally by applying gas temperatures as measured by ASCA to isothermal β-models of the ROSAT X-ray surface brightness profiles, with the WMAP point-spread function fully taken into consideration. After co-adding the 31 cluster fields to significantly reduce the systematic and random uncertainties, it appears that WMAP detected the SZE in all three bands. Quantitatively, however, the observed SZE only accounts for about 1/4 of the expected decrement. The discrepancy represents too much unexplained extra flux: in the W band, the detected SZE corresponds on average to 5.6 times less X-ray gas mass within a 10' radius than the mass value given by the ROSAT β-model. We critically examined how the X-ray prediction of the SZE may depend on our uncertainties in the density and temperature of the hot intracluster plasma, and emission by cluster radio sources. Although our comparison between the detected and expected SZE levels is subject to a margin of error, the fact remains that the average observed SZE depth and profile are consistent with those of the primary CMB anisotropy, i.e., the overall WMAP temperature decrement among the 31 rich clusters is too shallow to necessitate an interpretation in terms of an additional effect like the SZE. A unique aspect of this SZE investigation is that because all the data being analyzed are in the public domain, our work is readily open to scrutiny by others.

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Journal keyword(s): Galaxies: Clusters: General

Simbad objects: 37

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Number of rows : 37
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 2717 ClG 00 03 12.9 -35 56 13           ~ 146 0
2 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
3 ACO 21 ClG 00 20 38.75 +28 41 40.5           ~ 122 0
4 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
5 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 391 1
6 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
7 ACO 3301 ClG 05 01 05.8 -38 43 58           ~ 44 0
8 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 457 0
9 ACO 1045 ClG 10 34 52.19 +30 41 41.5           ~ 37 0
10 ACO 1068 ClG 10 40 47.1 +39 57 19           ~ 232 0
11 ACO 1302 ClG 11 33 12.02 +66 22 26.9           ~ 81 0
12 ACO 1314 ClG 11 34 53.0 +49 05 18           ~ 234 1
13 ACO 1361 ClG 11 43 45.85 +46 20 51.8           ~ 96 0
14 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
15 ACO 1413 ClG 11 55 12.87 +23 23 46.9           ~ 456 0
16 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
17 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
18 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
19 ACO 3558 ClG 13 28 03.2 -31 31 35           ~ 476 2
20 ACO 3560 ClG 13 32 23.7 -33 08 21           ~ 145 1
21 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 337 1
22 ACO 3571 ClG 13 47 32.4 -32 50 12           ~ 308 2
23 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
24 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
25 ACO 1991 ClG 14 54 41.53 +18 38 08.4           ~ 349 1
26 ACO 2029 ClG 15 10 54.2 +05 44 23           ~ 1020 0
27 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
28 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
29 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
30 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 381 0
31 ACO 2241 ClG 16 59 42.58 +32 34 44.4           ~ 85 1
32 ACO 2244 ClG 17 02 40.33 +34 02 58.7           ~ 301 0
33 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
34 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
35 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 572 0
36 ACO 2670 ClG 23 54 10.51 -10 23 06.8           ~ 364 0
37 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 400 1

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