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	SIGNIFICANT FOREGROUND UNRELATED NON-ACOUSTIC ANISOTROPY ON THE 1 DEGREE SCALE IN WILKINSON MICROWAVE ANISOTROPY PROBE 5-YEAR OBSERVATIONS
	Jiang, Bi-Zhu ; Lieu, Richard ; Zhang, Shuang-Nan ; Wakker, Bart
	2010-10-12 ; 2010-10-12
关键词	cosmic microwave background ISM: clouds methods: data analysis HIGH-VELOCITY CLOUDS WMAP OBSERVATIONS TEMPERATURE EMISSION DISTANCES CLUSTERS MAPS Astronomy & Astrophysics
中文摘要	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.
语种	英语 ; 英语
出版者	IOP PUBLISHING LTD ; BRISTOL ; DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/81363]
专题	清华大学
推荐引用方式 GB/T 7714	Jiang, Bi-Zhu,Lieu, Richard,Zhang, Shuang-Nan,et al. SIGNIFICANT FOREGROUND UNRELATED NON-ACOUSTIC ANISOTROPY ON THE 1 DEGREE SCALE IN WILKINSON MICROWAVE ANISOTROPY PROBE 5-YEAR OBSERVATIONS[J],2010, 2010.
APA	Jiang, Bi-Zhu,Lieu, Richard,Zhang, Shuang-Nan,&Wakker, Bart.(2010).SIGNIFICANT FOREGROUND UNRELATED NON-ACOUSTIC ANISOTROPY ON THE 1 DEGREE SCALE IN WILKINSON MICROWAVE ANISOTROPY PROBE 5-YEAR OBSERVATIONS..
MLA	Jiang, Bi-Zhu,et al."SIGNIFICANT FOREGROUND UNRELATED NON-ACOUSTIC ANISOTROPY ON THE 1 DEGREE SCALE IN WILKINSON MICROWAVE ANISOTROPY PROBE 5-YEAR OBSERVATIONS".(2010).

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