Title:	Using the Sun to Measure the Primary Beam Response of the Canadian Hydrogen Intensity Mapping Experiment
Authors:	The 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 Hofer, 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 Siege, Seth R. Singh, Saurabh Vanderlinde, Keith Wang, Haochen Willis, James S. Wulf, Dallas
Issue Date:	20-Jun-2022
Publisher:	IOP Sciences for The American Astronomical Society
Citation:	The Astrophysical Journal, 2022, Vol.932, p100
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 that spans ∼7200 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.
Description:	Open Access
URI:	http://hdl.handle.net/2289/7969
ISSN:	0004-637X 1538-4357(Online)
Alternative Location:	https://ui.adsabs.harvard.edu/abs/2022arXiv220111822C/abstract https://arxiv.org/abs/2201.11822 https://doi.org/10.3847/1538-4357/ac6b9f
Copyright:	2022, The American Astronomical Society
Appears in Collections:	Research Papers (A&A)

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