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Mitigating calibration errors from mutual coupling with time-domain filtering of 21 cm cosmological radio observations

Fuente: arXiv

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Autori principali:	Charles, N., Kern, N. S., Pascua, R., Bernardi, G., Bester, L., Smirnov, O., Acedo, E. d. L., Abdurashidova, Z., Adams, T., Aguirre, J. E., Baartman, R., Beardsley, A. P., Berkhout, L. M., Billings, T. S., Bowman, J. D., Bull, P., Burba, J., Byrne, R., Carey, S., Chen, K., Choudhuri, S., Cox, T., DeBoer, D. R., Dexter, M., Dillon, J. S., Dynes, S., Eksteen, N., Ely, J., Ewall-Wice, A., Fritz, R., Furlanetto, S. R., Gale-Sides, K., Garsden, H., Gehlot, B. K., Ghosh, A., Gorce, A., Gorthi, D., Halday, Z., Hazelton, B. J., Hewitt, J. N., Hickish, J., Huang, T., Jacobs, D. C., Josaitis, A., Kerrigan, J., Kittiwisit, P., Kolopanis, M., Lanman, A., Liu, A., Ma, Y. -Z., MacMahon, D. H. E., Malan, L., Malgas, K., Malgas, C., Marero, B., Martinot, Z. E., McBride, L., Mesinger, A., Mohamed-Hinds, N., Molewa, M., Morales, M. F., Murray, S., Nikolic, B., Nuwegeld, H., Parsons, A. R., Patra, N., Plante, P. L., Qin, Y., Rath, E., Razavi-Ghods, N., Riley, D., Robnett, J., Rosie, K., Santos, M. G., Sims, P., Singh, S., Storer, D., Swarts, H., Tan, J., Wilensky, M. J., Williams, P. K. G., Wyngaarden, P. v., Zheng, H.
Natura:	Preprint
Pubblicazione:	2024
Soggetti:	Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics
Accesso online:	Acceder al recurso
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_version_	1866911972314841088
author	Charles, N. Kern, N. S. Pascua, R. Bernardi, G. Bester, L. Smirnov, O. Acedo, E. d. L. Abdurashidova, Z. Adams, T. Aguirre, J. E. Baartman, R. Beardsley, A. P. Berkhout, L. M. Billings, T. S. Bowman, J. D. Bull, P. Burba, J. Byrne, R. Carey, S. Chen, K. Choudhuri, S. Cox, T. DeBoer, D. R. Dexter, M. Dillon, J. S. Dynes, S. Eksteen, N. Ely, J. Ewall-Wice, A. Fritz, R. Furlanetto, S. R. Gale-Sides, K. Garsden, H. Gehlot, B. K. Ghosh, A. Gorce, A. Gorthi, D. Halday, Z. Hazelton, B. J. Hewitt, J. N. Hickish, J. Huang, T. Jacobs, D. C. Josaitis, A. Kerrigan, J. Kittiwisit, P. Kolopanis, M. Lanman, A. Liu, A. Ma, Y. -Z. MacMahon, D. H. E. Malan, L. Malgas, K. Malgas, C. Marero, B. Martinot, Z. E. McBride, L. Mesinger, A. Mohamed-Hinds, N. Molewa, M. Morales, M. F. Murray, S. Nikolic, B. Nuwegeld, H. Parsons, A. R. Patra, N. Plante, P. L. Qin, Y. Rath, E. Razavi-Ghods, N. Riley, D. Robnett, J. Rosie, K. Santos, M. G. Sims, P. Singh, S. Storer, D. Swarts, H. Tan, J. Wilensky, M. J. Williams, P. K. G. Wyngaarden, P. v. Zheng, H.
author_facet	Charles, N. Kern, N. S. Pascua, R. Bernardi, G. Bester, L. Smirnov, O. Acedo, E. d. L. Abdurashidova, Z. Adams, T. Aguirre, J. E. Baartman, R. Beardsley, A. P. Berkhout, L. M. Billings, T. S. Bowman, J. D. Bull, P. Burba, J. Byrne, R. Carey, S. Chen, K. Choudhuri, S. Cox, T. DeBoer, D. R. Dexter, M. Dillon, J. S. Dynes, S. Eksteen, N. Ely, J. Ewall-Wice, A. Fritz, R. Furlanetto, S. R. Gale-Sides, K. Garsden, H. Gehlot, B. K. Ghosh, A. Gorce, A. Gorthi, D. Halday, Z. Hazelton, B. J. Hewitt, J. N. Hickish, J. Huang, T. Jacobs, D. C. Josaitis, A. Kerrigan, J. Kittiwisit, P. Kolopanis, M. Lanman, A. Liu, A. Ma, Y. -Z. MacMahon, D. H. E. Malan, L. Malgas, K. Malgas, C. Marero, B. Martinot, Z. E. McBride, L. Mesinger, A. Mohamed-Hinds, N. Molewa, M. Morales, M. F. Murray, S. Nikolic, B. Nuwegeld, H. Parsons, A. R. Patra, N. Plante, P. L. Qin, Y. Rath, E. Razavi-Ghods, N. Riley, D. Robnett, J. Rosie, K. Santos, M. G. Sims, P. Singh, S. Storer, D. Swarts, H. Tan, J. Wilensky, M. J. Williams, P. K. G. Wyngaarden, P. v. Zheng, H.
contents	The 21 cm transition from neutral Hydrogen promises to be the best observational probe of the Epoch of Reionisation (EoR). This has led to the construction of low-frequency radio interferometric arrays, such as the Hydrogen Epoch of Reionization Array (HERA), aimed at systematically mapping this emission for the first time. Precision calibration, however, is a requirement in 21 cm radio observations. Due to the spatial compactness of HERA, the array is prone to the effects of mutual coupling, which inevitably lead to non-smooth calibration errors that contaminate the data. When unsmooth gains are used in calibration, intrinsically spectrally-smooth foreground emission begins to contaminate the data in a way that can prohibit a clean detection of the cosmological EoR signal. In this paper, we show that the effects of mutual coupling on calibration quality can be reduced by applying custom time-domain filters to the data prior to calibration. We find that more robust calibration solutions are derived when filtering in this way, which reduces the observed foreground power leakage. Specifically, we find a reduction of foreground power leakage by 2 orders of magnitude at k=0.5.
format	Preprint
id	arxiv_https___arxiv_org_abs_2407_20923
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Mitigating calibration errors from mutual coupling with time-domain filtering of 21 cm cosmological radio observations Charles, N. Kern, N. S. Pascua, R. Bernardi, G. Bester, L. Smirnov, O. Acedo, E. d. L. Abdurashidova, Z. Adams, T. Aguirre, J. E. Baartman, R. Beardsley, A. P. Berkhout, L. M. Billings, T. S. Bowman, J. D. Bull, P. Burba, J. Byrne, R. Carey, S. Chen, K. Choudhuri, S. Cox, T. DeBoer, D. R. Dexter, M. Dillon, J. S. Dynes, S. Eksteen, N. Ely, J. Ewall-Wice, A. Fritz, R. Furlanetto, S. R. Gale-Sides, K. Garsden, H. Gehlot, B. K. Ghosh, A. Gorce, A. Gorthi, D. Halday, Z. Hazelton, B. J. Hewitt, J. N. Hickish, J. Huang, T. Jacobs, D. C. Josaitis, A. Kerrigan, J. Kittiwisit, P. Kolopanis, M. Lanman, A. Liu, A. Ma, Y. -Z. MacMahon, D. H. E. Malan, L. Malgas, K. Malgas, C. Marero, B. Martinot, Z. E. McBride, L. Mesinger, A. Mohamed-Hinds, N. Molewa, M. Morales, M. F. Murray, S. Nikolic, B. Nuwegeld, H. Parsons, A. R. Patra, N. Plante, P. L. Qin, Y. Rath, E. Razavi-Ghods, N. Riley, D. Robnett, J. Rosie, K. Santos, M. G. Sims, P. Singh, S. Storer, D. Swarts, H. Tan, J. Wilensky, M. J. Williams, P. K. G. Wyngaarden, P. v. Zheng, H. Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics The 21 cm transition from neutral Hydrogen promises to be the best observational probe of the Epoch of Reionisation (EoR). This has led to the construction of low-frequency radio interferometric arrays, such as the Hydrogen Epoch of Reionization Array (HERA), aimed at systematically mapping this emission for the first time. Precision calibration, however, is a requirement in 21 cm radio observations. Due to the spatial compactness of HERA, the array is prone to the effects of mutual coupling, which inevitably lead to non-smooth calibration errors that contaminate the data. When unsmooth gains are used in calibration, intrinsically spectrally-smooth foreground emission begins to contaminate the data in a way that can prohibit a clean detection of the cosmological EoR signal. In this paper, we show that the effects of mutual coupling on calibration quality can be reduced by applying custom time-domain filters to the data prior to calibration. We find that more robust calibration solutions are derived when filtering in this way, which reduces the observed foreground power leakage. Specifically, we find a reduction of foreground power leakage by 2 orders of magnitude at k=0.5.
title	Mitigating calibration errors from mutual coupling with time-domain filtering of 21 cm cosmological radio observations
topic	Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2407.20923