Simulating Calibration and Beam Systematics for a Future CMB Space Mission with the TOAST Package
Simulating Calibration and Beam Systematics for a Future CMB Space Mission with the TOAST Package
复制标题
使用 TOAST 软件包模拟未来 CMB 太空任务的校准和光束系统学
DOI：
10.3847/2515-5172/ac0823
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
J. Borrill
中科院分区：
文献类型：
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作者：
G. Puglisi;R. Keskitalo;T. Kisner;J. Borrill
在这项工作中，我们解决的仪器系统误差，可能会影响即将到来的和未来的宇宙微波背景实验，旨在观察其偏振发射。特别是，我们专注于系统引起的光束和校准，这被认为是泄漏的主要来源，从总强度测量偏振。我们模拟合成数据集与时间有序天体物理学可扩展的工具，一个公开的模拟和数据分析包。我们还提出了一种缓解技术，旨在减少泄漏的模板拟合的方法。当应用于LiteBIRD卫星使命的一个现实的模拟数据集时，这种技术已经显示出有希望的结果，在功率谱水平上将泄漏减少2个数量级。
We address in this work the instrumental systematic errors that can potentially affect the forthcoming and future Cosmic Microwave Background experiments aimed at observing its polarized emission. In particular, we focus on the systematics induced by the beam and calibration, which are considered the major sources of leakage from total intensity measurements to polarization. We simulated synthetic data sets with Time-Ordered Astrophysics Scalable Tools, a publicly available simulation and data analysis package. We also propose a mitigation technique aiming at reducing the leakage by means of a template fitting approach. This technique has shown promising results reducing the leakage by 2 orders of magnitude at the power spectrum level when applied to a realistic simulated data set of the LiteBIRD satellite mission.