宇宙微波背景应用的全天空波束卷积
Full-sky beam convolution for cosmic microwave background applications
摘要：
我们介绍了一个公开的全天空波束卷积代码库，旨在告知未来的宇宙微波背景（CMB）仪器的设计，并帮助当前的实验探测潜在的系统效应。该代码可用于评估光学系统学对现实实验数据简化所有阶段的影响，包括功率谱估计之外的分析，方法是生成信号时间线，可作为完整分析管道的输入。本文讨论了Python代码的设计和数学框架，以及一些简单的基准测试结果。我们提出了一个简单的双透镜折射望远镜的设计，并使用它与代码一起模拟一年的数据集，400个探测器扫描卫星仪器上的天空。模拟结果确定了一些子领先的光学非理想性，并表现出显着的B-模式残差所造成的扩展旁瓣是敏感的偏振辐射从银河系。对于所提出的设计和卫星扫描策略，我们表明，一个完整的物理光学光束模型产生的B模式系统，显着不同于简单的椭圆高斯模型。代码可在https://github.com/adrijd/beamconv上获得
英文摘要：
We introduce a publicly available full-sky beam convolution code library intended to inform the design of future cosmic microwave background (CMB) instruments and help current experiments probe potential systematic effects. The code can be used to assess the impact of optical systematics on all stages of data reduction for a realistic experiment, including analyses beyond power spectrum estimation, by generating signal timelines that may serve as input to full analysis pipelines. The design and mathematical framework of the Python code is discussed along with a few simple benchmarking results. We present a simple two-lens refracting telescope design and use it together with the code to simulate a year-long dataset for 400 detectors scanning the sky on a satellite instrument. The simulation results identify a number of sub-leading optical non-idealities and demonstrate significant B-mode residuals caused by extended sidelobes that are sensitive to polarized radiation from the Galaxy. For the proposed design and satellite scanning strategy, we show that a full physical optics beam model generates B-mode systematics that differ significantly from the simpler elliptical Gaussian model. The code is available at https://github.com/adrijd/beamconv
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