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, JPD; Zhang SN(张双南); Zhang, SN
刊名ASTROPHYSICAL JOURNAL
2006
卷号648期号:1页码:#REF!
关键词galaxies : clusters : general
学科分类Astronomy & Astrophysics
DOI10.1086/505627
通讯作者Lieu, R (reprint author), Univ Alabama, Dept Phys, Huntsville, AL 35899 USA.
文章类型Article
英文摘要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 vertical bar b vertical bar > 30 degrees. 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 beta-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 100 radius than the mass value given by the ROSAT beta-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.
类目[WOS]Astronomy & Astrophysics
收录类别SCI
WOS记录号WOS:000240230200017
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被引频次:39[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/226696
专题中国科学院高能物理研究所_加速器中心_期刊论文
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Lieu, R,Mittaz, JPD,Zhang SN,et al. 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[J]. ASTROPHYSICAL JOURNAL,2006,648(1):#REF!.
APA Lieu, R,Mittaz, JPD,张双南,&Zhang, SN.(2006).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.ASTROPHYSICAL JOURNAL,648(1),#REF!.
MLA Lieu, R,et al."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".ASTROPHYSICAL JOURNAL 648.1(2006):#REF!.
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