학술논문
Using the Sun to Measure the Primary Beam Response of the Canadian Hydrogen Intensity Mapping Experiment
Document Type
Working Paper
Author
CHIME Collaboration; Amiri, Mandana; Bandura, Kevin; Boskovic, Anja; Cliche, Jean-François; Deng, Meiling; Dobbs, Matt; Fandino, Mateus; Foreman, Simon; Halpern, Mark; Hill, Alex S.; Hinshaw, Gary; Höfer, Carolin; Kania, Joseph; Landecker, T. L.; MacEachern, Joshua; Masui, Kiyoshi; Mena-Parra, Juan; Newburgh, Laura; Ordog, Anna; Pinsonneault-Marotte, Tristan; Polzin, Ava; Reda, Alex; Shaw, J. Richard; Siegel, Seth R.; Singh, Saurabh; Vanderlinde, Keith; Wang, Haochen; Willis, James S.; Wulf, Dallas
Source
ApJ 923 100 (2022)
Subject
Language
Abstract
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.
Comment: 11 pages, 9 figures, Accepted by ApJ
Comment: 11 pages, 9 figures, Accepted by ApJ