阿塔卡马宇宙学望远镜：带通测量与系统误差分析
The Atacama Cosmology Telescope: Passband Measurements with an Analysis of Systematic Errors
AI总结：
该研究针对AdvACT多频探测器阵列的带通开展测量，通过FTS结合耦合光学元件获取数据，经模拟校正系统误差后得到带通及不确定度，还探讨了现有性能与未来改进方向。
AI中文摘要：
我们对四个Advanced ACTPol（AdvACT）多频探测器阵列的光谱响应进行了测量，这些阵列在中心频率约为30、40、90、150和220 GHz的频带中开展观测。带通是通过傅里叶变换光谱仪（FTS）结合耦合光学元件测量得到的，耦合光学元件用于引导并匹配FTS的输出至AdvACT接收机。我们对FTS和耦合光学元件进行光学模拟，以建模该系统中与频率相关的系统效应；利用这些模拟结果对测量值进行校正，并评估剩余的系统不确定度。我们将这些系统估计值与统计误差相结合，确定了通过FTS测量得到的带通及其不确定度，每个探测器阵列的不确定度通常为0.75%至1.5%。我们在统一框架下呈现了ACT所有测量的带通特性，此外还讨论了当前取得的性能以及未来改进带通测量的方法。
英文摘要：
We present measurements of the spectral response of the four Advanced ACTPol (AdvACT) multichroic detector arrays, which observed in frequency bands centered near 30, 40, 90, 150, and 220 GHz. The passbands were measured with a Fourier transform spectrometer (FTS) combined with coupling optics that direct and match the output of the FTS to the AdvACT receiver. We perform optical simulations of the FTS and coupling optics in order to model frequency-dependent systematic effects in this system. We use these simulations to apply corrections to the measurements and evaluate the remaining systematic uncertainty. We combine these systematic estimates with statistical errors to determine the measured passbands and their uncertainties from our FTS measurement, which are typically 0.75 to 1.5% per detector array. We present the passband characteristics for all measurements made by ACT in a common framework. Additionally, we discuss the performance achieved as well as ways to improve passband measurements in the future.
