Diagnosing timing error in WMAP data

	Diagnosing timing error in WMAP data
	Liu H(刘浩); Xiong SL(熊少林); Li TB(李惕碚); Liu, H; Xiong, SL; Li, TP
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2011
卷号	413 期号:1 页码:L96-L100
关键词	methods: data analysis cosmic background radiation cosmology: observations
通讯作者	[Liu, Hao ; Xiong, Shao-Lin ; Li, Ti-Pei] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing, Peoples R China ; [Li, Ti-Pei] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China ; [Li, Ti-Pei] Tsinghua Univ, Ctr Astrophys, Beijing 100084, Peoples R China ; [Li, Ti-Pei] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China
英文摘要	The Doppler dipole signal dominates the cosmic microwave background (CMB) anisotropy maps obtained by the Wilkinson Microwave Anisotropy Probe (WMAP) mission, and plays a key role throughout the data processing. Previously, we discovered a timing asynchronism of -25.6 ms between the timestamps of the spacecraft attitude and radiometer output in the original raw WMAP time-ordered data (TOD), which, if not corrected during data processing, would generate an artificial quadrupole component (l = 2) in recovered CMB maps (Liu, Xiong & Li 2010). Recently, Roukema (2010b) proves that there does exist a timing offset-induced error corresponding to about -25.6 ms in the WMAP calibrated TOD, by studying the fluctuation variance per pixel in the temperature map recovered from the TOD as a function of assumed timing offset. Here, we find evidence directly in the WMAP TOD for such an uncorrected timing error, which possibly occurred in calculating the Doppler dipole signal during the WMAP team's TOD data processing. The amplitude is highly significant and is consistent with previous work. We also show that the uncorrected timing offset can lead the WMAP CMB quadrupole to be substantially overestimated.
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:000291558100021
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/240311]
专题	高能物理研究所_院士高能物理研究所_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	Liu H,Xiong SL,Li TB,et al. Diagnosing timing error in WMAP data[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,413(1):L96-L100.
APA	刘浩,熊少林,李惕碚,Liu, H,Xiong, SL,&Li, TP.(2011).Diagnosing timing error in WMAP data.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,413(1),L96-L100.
MLA	刘浩,et al."Diagnosing timing error in WMAP data".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 413.1(2011):L96-L100.