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
文献类型：期刊论文
| 作者 | Lieu, Richard; Mittaz, Jonathan P. D.; Zhang, Shuang-Nan |
| 刊名 | Astrophysical journal
 |
| 出版日期 | 2006-09-01 |
| 卷号 | 648期号:1页码:176-199 |
| ISSN号 | 0004-637X |
| 关键词 | Galaxies : clusters : general |
| 通讯作者 | Lieu, richard() |
| 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. |
| WOS关键词 | GALAXY CLUSTERS ; DISTANCE SCALE ; EMISSION ; CONSTRAINTS ; MAPS |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | UNIV CHICAGO PRESS |
| WOS记录号 | WOS:000240230200017 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2175838 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Lieu, Richard |
| 作者单位 | 1.Univ Alabama, Dept Phys, Huntsville, AL 35899 USA 2.Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China 3.Tsing Hua Univ, Ctr Astrophys, Beijing 100084, Peoples R China 4.Chinese Acad Sci, Key Lab Particle Astrophys, Inst High Energy Phys, Beijing 100039, Peoples R China 5.NASA, George C Marshall Space Flight Ctr, NSSTC, Huntsville, AL 35805 USA |
| 推荐引用方式 GB/T 7714 | Lieu, Richard,Mittaz, Jonathan P. D.,Zhang, Shuang-Nan. 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):176-199. |
| APA | Lieu, Richard,Mittaz, Jonathan P. D.,&Zhang, Shuang-Nan.(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),176-199. |
| MLA | Lieu, Richard,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):176-199. |
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