Fast map-based simulations of systematics in CMB surveys including effects of the scanning strategy
Fast map-based simulations of systematics in CMB surveys including effects of the scanning strategy
复制标题
CMB 调查中基于地图的系统学快速模拟，包括扫描策略的影响
DOI：
10.1093/mnras/stac561
复制
发表时间：
2022
影响因子：
4.8
通讯作者：
McCallum N
中科院分区：
文献类型：
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作者：
McCallum N
我们提出了快速模拟影响 CMB 观测的系统学的方法，包括扫描策略的影响。利用扫描的汇总属性，我们捕获全时有序数据 (TOD) 模拟的特征，从而能够以大大提高的速度为许多系统生成地图和功率谱 - 我们提出的案例在实施基于地图的方法时经历了 3-4 个数量级的加速。我们通过直接与完整的 TOD 模拟进行比较，证明了这些方法在捕获扫描显着特征方面的有效性——在低于百分之一的准确度水平上看到了一致性。我们模拟了微分增益、指向和椭圆度的影响，以显示这些方法的有效性，但请注意，可以将这些技术扩展到其他系统学。最后，我们展示了如何将这些基于地图的系统效应快速模拟应用于全焦平面，展示了它们整合数千个探测器的能力，如现代 CMB 实验中所见。
We present approaches to quickly simulate systematics affecting CMB observations, including the effects of the scanning strategy. Using summary properties of the scan, we capture features of full time ordered data (TOD) simulations, allowing maps and power spectra to be generated at much improved speed for a number of systematics – the cases we present experienced speed ups of 3–4 orders of magnitude when implementing the map-based approaches. We demonstrate the effectiveness of the approaches at capturing the salient features of the scan by directly comparing to full TOD simulations – seeing agreement at sub-per cent levels of accuracy. We simulate the effects of differential gain, pointing, and ellipticity to show the effectiveness of the approaches, but note that one could extend these techniques to other systematics. We finally show how to apply these fast map-based simulations of systematic effects to a full focal plane showing their ability to incorporate thousands of detectors as seen in modern CMB experiments.