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Diagnosing Timing Error in WMAP Data | | Hao Liu
; Shao-Lin Xiong
; Ti-Pei Li
; | | Date: |
14 Sep 2010 | | Abstract: | The Doppler dipole signal dominates the cosmic microwave background (CMB) sky
temperature maps obtained by the Wilkinson Microwave Anisotropy Probe (WMAP)
observations, and plays a key role throughout the WMAP data processing.
Previously, we discovered a timing asynchrony of -25.6 ms between the
spacecraft attitude and radiometer output timestamps in the original raw WMAP
time-ordered data (TOD), which, if not corrected in following data processing,
would generate an artificial quadrupole component in recovered CMB maps (Liu,
Xiong & Li 2010). Recently, Roukema (2010) proves that there does exist a
timing-offset-induced error corresponding to ~ -25.6 ms in the WMAP calibrated
TOD. Here, we find direct evidence for such an uncorrected timing asynchrony
occurred in calculating the Doppler dipole signal during the WMAP team’s
data-calibration and map-making with almost the same amplitude to previous
works at >8.7sigma significance and show that the uncorrected timing-offset
leads the WMAP CMB quadrupole being substantially overestimated. | | Source: | arXiv, 1009.2701 | | Services: | Forum | Review | PDF | Favorites | |
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