APA
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Reda, A., Pinsonneault-Marotte, T., Deng, M., Amiri, M., Bandura, K., Chakraborty, A., … Wulf, D. (2022). Characterization of the John A. Galt Telescope for radio holography with CHIME. Astronomical Telescopes + Instrumentation.
Chicago/Turabian
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Reda, A., T. Pinsonneault-Marotte, M. Deng, M. Amiri, K. Bandura, A. Chakraborty, S. Foreman, et al. “Characterization of the John A. Galt Telescope for Radio Holography with CHIME.” Astronomical Telescopes + Instrumentation (2022).
MLA
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Reda, A., et al. “Characterization of the John A. Galt Telescope for Radio Holography with CHIME.” Astronomical Telescopes + Instrumentation, 2022.
BibTeX Click to copy
@article{a2022a,
title = {Characterization of the John A. Galt Telescope for radio holography with CHIME},
year = {2022},
journal = {Astronomical Telescopes + Instrumentation},
author = {Reda, A. and Pinsonneault-Marotte, T. and Deng, M. and Amiri, M. and Bandura, K. and Chakraborty, A. and Foreman, S. and Hill, A. and Kania, Joseph W. and MacEachern, Joshua and Masui, K. and Newburgh, L. and Paul, S. and Siegel, S. and Smegal, R. and Wang, Haochen and Wulf, D.}
}
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) will measure the 21 cm emission of astrophysical neutral hydrogen to probe large scale structure at redshifts z = 0.8–2.5. However, detecting the 21 cm signal beneath substantially brighter foregrounds remains a key challenge. Due to the high dynamic range between 21 cm and foreground emission, an exquisite calibration of instrument systematics, notably the telescope beam, is required to successfully filter out the foregrounds. One technique being used to achieve a high fidelity measurement of the CHIME beam is radio holography, wherein signals from each of CHIME’s analog inputs are correlated with the signal from a co-located reference antenna, the 26 m John A. Galt telescope, as the 26 m Galt telescope tracks a bright point source transiting over CHIME. In this work we present an analysis of several of the Galt telescope’s properties. We employ drift-scan measurements of several bright sources, along with background estimates derived from the 408 MHz Haslam map, to estimate the Galt system temperature. To determine the Galt telescope’s beam shape, we perform and analyze a raster scan of the bright radio source Cassiopeia A. Finally, we use early holographic measurements to measure the Galt telescope’s geometry with respect to CHIME for the holographic analysis of the CHIME-Galt interferometric data set.