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arXiv 2102.00133astro-ph.CO
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CMB偏振透镜分析中观测系统误差的数值研究

A numerical study of observational systematic errors in lensing analysis of CMB polarization

Ryo Nagata, Toshiya Namikawa

摘要:

通过数值模拟研究了观测系统误差对宇宙微波背景(CMB)极化透镜分析的影响。我们对CMB偏振观测中的增益、角度和指向误差进行了建模,并模拟了由这些误差调制的偏振场。我们讨论了系统引起的$B$模式的振幅和空间尺度的施加误差的响应,并表明,透镜重建和脱透镜分析的结果表现根据它。据观察,在不久的将来预期的误差水平导致脱透镜效率没有显着下降。

英文摘要:

Impacts of observational systematic errors on the lensing analysis of the cosmic microwave background (CMB) polarization are investigated by numerical simulations. We model errors of gain, angle, and pointing in observation of the CMB polarization and simulate polarization fields modulated by the errors. We discuss the response of systematics-induced $B$-modes to amplitude and spatial scale of the imposed errors and show that the results of the lensing reconstruction and delensing analysis behave according to it. It is observed that error levels expected in the near future lead to no significant degradation in delensing efficiency.

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