CALIBRATION OF THE EDGES HIGH-BAND RECEIVER TO OBSERVE THE GLOBAL 21 cm SIGNATURE FROM THE EPOCH OF REIONIZATION
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Monsalve-2017-CALIBRATION OF THE EDGES HIGH-BA.pdf
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Author(s)
Monsalve, Raul A.
Bowman, Judd D.
Mozdzen, Thomas J.
Rogers, Alan E E
Date Issued
January 2017
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Monsalve, Raul A.; Rogers, Alan E. E.; Bowman, Judd D. and Mozdzen, Thomas J. “CALIBRATION OF THE EDGES HIGH-BAND RECEIVER TO OBSERVE THE GLOBAL 21 Cm SIGNATURE FROM THE EPOCH OF REIONIZATION.” The Astrophysical Journal 835, no. 1 (January 2017): 49. © 2017 The American Astronomical Society
Version
Final published version
Abstract
The EDGES High-Band experiment aims to detect the sky-average brightness temperature of the 21 cm signal from the epoch of reionization in the redshift range 14.8≳ z ≳ 6.5.To probe this redshifted signal, EDGES High-Band conducts single-antenna measurements in the frequency range 90–190 MHz from the Murchison Radio-astronomy Observatory in Western Australia. In this paper, we describe the current strategy for calibration of the EDGES High-Band receiver and report calibration results for the instrument used in the 2015–2016 observational campaign. We propagate uncertainties in the receiver calibration measurements to the antenna temperature using a Monte Carlo approach. We define a performance objective of 1 mK residual rms after modeling foreground subtraction from a fiducial temperature spectrum using a five-term polynomial. Most of the calibration uncertainties yield residuals of 1 mK or less at 95 % confidence. However, current uncertainties in the antenna and receiver reflection coefficients can lead to residuals of up to 20 mK even in low-foreground sky regions. These dominant residuals could be reduced by (1) improving the accuracy in reflection measurements, especially their phase, (2) improving the impedance match at the antenna-receiver interface, and (3) decreasing the changes with frequency of the antenna reflection phase.
MIT Department
Haystack Observatory
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DOI of Published Version
https://doi.org/10.3847/1538-4357/835/1/49
