论文标题
延迟加权校准：21厘米宇宙学的精确校准，具有弹性的天空模型错误
Delay-Weighted Calibration: Precision Calibration for 21 cm Cosmology with Resilience to Sky Model Error
论文作者
论文摘要
21 cm宇宙学实验的主要挑战之一是克服校准误差。现场建立的校准方法需要精确精确的天空模型，而低级的天空模型误差会引入校准误差，从而破坏宇宙信号。我们提出了一种称为延迟加权校准或DWCAL的新型校准方法，即使在存在天空模型误差的情况下，也可以精确校准。天空模型误差不会平等影响所有功率谱模式，并且DWCAL从无误差模式中优先拟合校准解决方案。我们将此技术应用于模拟数据，表明它在存在逼真的天空模型误差水平的情况下大大减少了校准误差，并且可以提高21 cm功率谱敏感性，将其提高大约2个数量级。
One of the principal challenges of 21 cm cosmology experiments is overcoming calibration error. Established calibration approaches in the field require an exquisitely accurate sky model, and low-level sky model errors introduce calibration errors that corrupt the cosmological signal. We present a novel calibration approach called Delay-Weighted Calibration, or DWCal, that enables precise calibration even in the presence of sky model error. Sky model error does not affect all power spectrum modes equally, and DWCal fits calibration solutions preferentially from error-free modes. We apply this technique to simulated data, showing that it substantially reduces calibration error in the presence of realistic levels of sky model error and can improve 21 cm power spectrum sensitivity by approximately 2 orders of magnitude.
