SIGNIFICANT FOREGROUND UNRELATED NON-ACOUSTIC ANISOTROPY ON THE 1 DEGREE SCALE IN WILKINSON MICROWAVE ANISOTROPY PROBE 5-YEAR OBSERVATIONS

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 粒子天体物理中心

	SIGNIFICANT FOREGROUND UNRELATED NON-ACOUSTIC ANISOTROPY ON THE 1 DEGREE SCALE IN WILKINSON MICROWAVE ANISOTROPY PROBE 5-YEAR OBSERVATIONS
	Jiang, BZ; Lieu, R; Zhang SN(张双南); Zhang, SN; Wakker, B
刊名	ASTROPHYSICAL JOURNAL
	2010
卷号	708 期号:1 页码:375-380
关键词	cosmic microwave background ISM: clouds methods: data analysis
通讯作者	[Jiang, Bi-Zhu ; Zhang, Shuang-Nan] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China ; [Jiang, Bi-Zhu ; Zhang, Shuang-Nan] Tsinghua Univ, Ctr Astrophys, Beijing 100084, Peoples R China ; [Jiang, Bi-Zhu ; Lieu, Richard ; Zhang, Shuang-Nan] Univ Alabama, Dept Phys, Huntsville, AL 35899 USA ; [Zhang, Shuang-Nan] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing, Peoples R China ; [Wakker, Bart] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
英文摘要	The spectral variation of the cosmic microwave background (CMB) as observed by WMAP was tested using foreground reduced WMAP5 data, by producing subtraction maps at the 1 degrees angular resolution between the two cosmological bands of V and W, for masked sky areas that avoid the Galactic disk. The resulting V-W map revealed a non-acoustic signal over and above the WMAP5 pixel noise, with two main properties. First, it possesses quadrupole power at the approximate to 1 mu K level which may be attributed to foreground residuals. Second, it fluctuates also at all values of l > 2, especially on the 1 degrees scale (200 less than or similar to l less than or similar to 300). The behavior is random and symmetrical about zero temperature with an rms approximate to 7 mu K, or 10% of the maximum CMB anisotropy, which would require a "cosmic conspiracy" among the foreground components if it is a consequence of their existence. Both anomalies must be properly diagnosed and corrected if "precision" cosmology is the claim. The second anomaly is, however, more interesting because it opens the question on whether the CMB anisotropy genuinely represents primordial density seeds.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
原文出处	SCI
语种	英语
WOS记录号	WOS:000272790400033
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/237225]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Jiang, BZ,Lieu, R,Zhang SN,et al. SIGNIFICANT FOREGROUND UNRELATED NON-ACOUSTIC ANISOTROPY ON THE 1 DEGREE SCALE IN WILKINSON MICROWAVE ANISOTROPY PROBE 5-YEAR OBSERVATIONS[J]. ASTROPHYSICAL JOURNAL,2010,708(1):375-380.
APA	Jiang, BZ,Lieu, R,张双南,Zhang, SN,&Wakker, B.(2010).SIGNIFICANT FOREGROUND UNRELATED NON-ACOUSTIC ANISOTROPY ON THE 1 DEGREE SCALE IN WILKINSON MICROWAVE ANISOTROPY PROBE 5-YEAR OBSERVATIONS.ASTROPHYSICAL JOURNAL,708(1),375-380.
MLA	Jiang, BZ,et al."SIGNIFICANT FOREGROUND UNRELATED NON-ACOUSTIC ANISOTROPY ON THE 1 DEGREE SCALE IN WILKINSON MICROWAVE ANISOTROPY PROBE 5-YEAR OBSERVATIONS".ASTROPHYSICAL JOURNAL 708.1(2010):375-380.