论文标题
原始通货膨胀探索器（Pixie）的校准方法和不确定性
Calibration Method and Uncertainty for the Primordial Inflation Explorer (PIXIE)
论文作者
论文摘要
原始通货膨胀探索器（Pixie）是探险家级的任务概念，可从宇宙微波背景的线性极化和光谱扭曲中测量宇宙学信号，从完美的黑体中。靶向测量灵敏度为2--4个数量级低于竞争的天体物理前景，对仪器校准提出了严格的要求。板载黑体校准器呈现一个偏振傅里叶变换光谱仪，并具有已知信号，以使采样干扰条纹模式从遥测单元转换为物理单元。我们描述了校准小精灵，得出强度，极化和频率尺度的预期不确定性所需的仪器和操作，并显示了导出的宇宙学信号中校准不确定性的影响。预计在CMB主导的频率上，预计在$ 10^6 $中的几个部分将准确地校准，而在$ 10^4 $中的频率为$ 10^4 $，以较高的频率为主导。
The Primordial Inflation Explorer (PIXIE) is an Explorer-class mission concept to measure cosmological signals from both linear polarization of the cosmic microwave background and spectral distortions from a perfect blackbody. The targeted measurement sensitivity is 2--4 orders of magnitude below competing astrophysical foregrounds, placing stringent requirements on instrument calibration. An on-board blackbody calibrator presents a polarizing Fourier transform spectrometer with a known signal to enable conversion of the sampled interference fringe patterns from telemetry units to physical units. We describe the instrumentation and operations needed to calibrate PIXIE, derive the expected uncertainty for the intensity, polarization, and frequency scales, and show the effect of calibration uncertainty in the derived cosmological signals. In-flight calibration is expected to be accurate to a few parts in $10^6$ at frequencies dominated by the CMB, and a few parts in $10^4$ at higher frequencies dominated by the diffuse dust foreground.
