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arXiv 2201.11822astro-ph.IMastro-ph.CO
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利用太阳测量加拿大氢强度测绘实验的主束响应

Using the Sun to Measure the Primary Beam Response of the Canadian Hydrogen Intensity Mapping Experiment

CHIME Collaboration, Mandana Amiri, Kevin Bandura, Anja Boskovic, Jean-François Cliche, Meiling Deng, Matt Dobbs, Mateus Fandino, Simon Foreman, Mark Halpern, A… 展开作者

CHIME Collaboration, Mandana Amiri, Kevin Bandura, Anja Boskovic, Jean-François Cliche, Meiling Deng, Matt Dobbs, Mateus Fandino, Simon Foreman, Mark Halpern, Alex S. Hill, Gary Hinshaw, Carolin Höfer, Joseph Kania, T. L. Landecker, Joshua MacEachern, Kiyoshi Masui, Juan Mena-Parra, Laura Newburgh, Anna Ordog, Tristan Pinsonneault-Marotte, Ava Polzin, Alex Reda, J. Richard Shaw, Seth R. Siegel, Saurabh Singh, Keith Vanderlinde, Haochen Wang, James S. Willis, Dallas Wulf

摘要:

我们提出了一个光束模式测量的加拿大氢强度测绘实验(CHIME)使用太阳作为校准源。由于CHIME是一个纯漂移扫描仪器,我们依靠太阳的季节性南北运动来探测不同高度的光束。这种半年一次的高度范围,加上太阳的射电亮度,使得在天空中跨越约7,200平方度的光束测量成为可能,而无需移动望远镜。我们利用在太阳活动极小期附近进行的观测,以尽量减少太阳变化的影响,在观测期间,太阳变化的强度<10%。由此产生的数据集是高度互补的其他CHIME光束测量-无论是在角度覆盖和系统-并在正在进行的程序中发挥重要作用,以表征CHIME主光束。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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