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Precision Calibration for HERA and 21 cm Cosmology

  • Joshua S. Dillon (a1)

Abstract

Here I discuss progress in both the theory and practice of data analysis for the Hydrogen Epoch of Reionization Array (HERA), focusing on techniques to calibrate the instrumental response and preserve the spectral smoothness that is essential to separating the cosmological 21 cm signal from foregrounds that are five orders of magnitude brighter. I explain how mis-calibration can create ruinous spectral structure and how we take advantage of HERA’s highly-redundant configuration for calibration. This proceeding draws from a talk I gave on October 3, 2017. Slides for it and all my talks are available at joshdillon.net.

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References

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Ali, Z. S. et al. PAPER-64 Constraints on Reionization: The 21 cm Power Spectrum at z = 8.4. ApJ, 809: 61, August 2015.
Barry, N., Hazelton, B., Sullivan, I., Morales, M.F. and Pober, J.C. Calibration requirements for detecting the 21 cm epoch of reionization power spectrum and implications for the SKA. MNRAS, 461: 31353144, September 2016.
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DeBoer, D. R. et al. Hydrogen Epoch of Reionization Array (HERA). ArXiv e-prints, June 2016.
Dillon, J.S. and Parsons, A.R. Interferometric bandpass calibration with redundant baselines.
Dillon, J.S. and Parsons, A.R. Redundant Array Configurations for 21 cm Cosmology. ApJ, 826: 181, August 2016.
Ewall-Wice, A., Dillon, J.S., Liu, A. and Hewitt, J. The Impact of Modeling Errors on Interferometer Calibration for 21 cm Power Spectra. ArXiv e-prints, October 2016.
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Morales, M.F. and Wyithe, J.S.B. Reionization and Cosmology with 21-cm Fluctuations. ARA&A, 48: 127171, September 2010.
Orosz, N., Dillon, J.S., Ewall-Wice, A. and Parsons, A.R. Mitigating the effect of antenna position errors and beam variations on redundant-baseline calibration.
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Precision Calibration for HERA and 21 cm Cosmology

  • Joshua S. Dillon (a1)

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