论文标题
使用太阳测量加拿大氢强度映射实验的主要梁响应
Using the Sun to Measure the Primary Beam Response of the Canadian Hydrogen Intensity Mapping Experiment
论文作者
论文摘要
我们提出了使用太阳作为校准源制造的加拿大氢强度映射实验（Chime）的梁图案测量。由于Chime是一种纯净的漂移扫描仪器，因此我们依靠太阳的季节性南北运动来探测不同海拔的横梁。该半年度范围是海拔的，结合了太阳的无线电亮度，可以实现横梁测量，跨天空跨越7,200平方度，而无需移动望远镜。我们利用了接近太阳最小值的观测值，以最大程度地减少太阳可变性的影响，这在观察期间观察到的强度<10％。所得的数据集高度互补与其他循环梁测量值（无论是在角度覆盖范围和系统方面），并且在持续的程序中发挥了重要作用，以表征Chime Primeal Beam。
We present a beam pattern measurement of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) made using the Sun as a calibration source. As CHIME is a pure drift scan instrument, we rely on the seasonal North-South motion of the Sun to probe the beam at different elevations. This semiannual range in elevation, combined with the radio brightness of the Sun, enables a beam measurement which spans ~7,200 square degrees on the sky without the need to move the telescope. We take advantage of observations made near solar minimum to minimize the impact of solar variability, which is observed to be <10% in intensity over the observation period. The resulting data set is highly complementary to other CHIME beam measurements -- both in terms of angular coverage and systematics -- and plays an important role in the ongoing program to characterize the CHIME primary beam.
