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Investigating Mutual Coupling in the Hydrogen Epoch of Reionization Array and Mitigating its Effects on the 21-cm Power Spectrum

Fuente: arXiv

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Autori principali:	Rath, E., Pascua, R., Josaitis, A. T., Ewall-Wice, A., Fagnoni, N., Acedo, E. de Lera, Martinot, Z. E., Abdurashidova, Z., Adams, T., Aguirre, J. E., Baartman, R., Beardsley, A. P., Berkhout, L. M., Bernardi, G., Billings, T. S., Bowman, J. D., Bull, P., Burba, J., Byrne, R., Carey, S., Chen, K. -F., Choudhuri, S., Cox, T., DeBoer, D. R., Dexter, M., Dillon, J. S., Dynes, S., Eksteen, N., Ely, J., 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., Kern, N. S., Kerrigan, J., Kittiwisit, P., Kolopanis, M., Lanman, A., Liu, A., Ma, Y. -Z., MacMahon, D. H. E., Malan, L., Malgas, C., Malgas, K., Marero, B., McBride, L., Mesinger, A., Mohamed-Hinds, N., Molewa, M., Morales, M. F., Murray, S. G., Nikolic, B., Nuwegeld, H., Parsons, A. R., Patra, N., La Plante, P., Qin, Y., 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., van Wyngaarden, P., Zheng, H.
Natura:	Preprint
Pubblicazione:	2024
Soggetti:	Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics
Accesso online:	Acceder al recurso
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_version_	1866917692210937856
author	Rath, E. Pascua, R. Josaitis, A. T. Ewall-Wice, A. Fagnoni, N. Acedo, E. de Lera Martinot, Z. E. Abdurashidova, Z. Adams, T. Aguirre, J. E. Baartman, R. Beardsley, A. P. Berkhout, L. M. Bernardi, G. Billings, T. S. Bowman, J. D. Bull, P. Burba, J. Byrne, R. Carey, S. Chen, K. -F. Choudhuri, S. Cox, T. DeBoer, D. R. Dexter, M. Dillon, J. S. Dynes, S. Eksteen, N. Ely, J. 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. Kern, N. S. Kerrigan, J. Kittiwisit, P. Kolopanis, M. Lanman, A. Liu, A. Ma, Y. -Z. MacMahon, D. H. E. Malan, L. Malgas, C. Malgas, K. Marero, B. McBride, L. Mesinger, A. Mohamed-Hinds, N. Molewa, M. Morales, M. F. Murray, S. G. Nikolic, B. Nuwegeld, H. Parsons, A. R. Patra, N. La Plante, P. Qin, Y. 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. van Wyngaarden, P. Zheng, H.
author_facet	Rath, E. Pascua, R. Josaitis, A. T. Ewall-Wice, A. Fagnoni, N. Acedo, E. de Lera Martinot, Z. E. Abdurashidova, Z. Adams, T. Aguirre, J. E. Baartman, R. Beardsley, A. P. Berkhout, L. M. Bernardi, G. Billings, T. S. Bowman, J. D. Bull, P. Burba, J. Byrne, R. Carey, S. Chen, K. -F. Choudhuri, S. Cox, T. DeBoer, D. R. Dexter, M. Dillon, J. S. Dynes, S. Eksteen, N. Ely, J. 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. Kern, N. S. Kerrigan, J. Kittiwisit, P. Kolopanis, M. Lanman, A. Liu, A. Ma, Y. -Z. MacMahon, D. H. E. Malan, L. Malgas, C. Malgas, K. Marero, B. McBride, L. Mesinger, A. Mohamed-Hinds, N. Molewa, M. Morales, M. F. Murray, S. G. Nikolic, B. Nuwegeld, H. Parsons, A. R. Patra, N. La Plante, P. Qin, Y. 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. van Wyngaarden, P. Zheng, H.
contents	Interferometric experiments designed to detect the highly redshifted 21-cm signal from neutral hydrogen are producing increasingly stringent constraints on the 21-cm power spectrum, but some k-modes remain systematics-dominated. Mutual coupling is a major systematic that must be overcome in order to detect the 21-cm signal, and simulations that reproduce effects seen in the data can guide strategies for mitigating mutual coupling. In this paper, we analyse 12 nights of data from the Hydrogen Epoch of Reionization Array and compare the data against simulations that include a computationally efficient and physically motivated semi-analytic treatment of mutual coupling. We find that simulated coupling features qualitatively agree with coupling features in the data; however, coupling features in the data are brighter than the simulated features, indicating the presence of additional coupling mechanisms not captured by our model. We explore the use of fringe-rate filters as mutual coupling mitigation tools and use our simulations to investigate the effects of mutual coupling on a simulated cosmological 21-cm power spectrum in a "worst case" scenario where the foregrounds are particularly bright. We find that mutual coupling contaminates a large portion of the "EoR Window", and the contamination is several orders-of-magnitude larger than our simulated cosmic signal across a wide range of cosmological Fourier modes. While our fiducial fringe-rate filtering strategy reduces mutual coupling by roughly a factor of 100 in power, a non-negligible amount of coupling cannot be excised with fringe-rate filters, so more sophisticated mitigation strategies are required.
format	Preprint
id	arxiv_https___arxiv_org_abs_2406_08549
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Investigating Mutual Coupling in the Hydrogen Epoch of Reionization Array and Mitigating its Effects on the 21-cm Power Spectrum Rath, E. Pascua, R. Josaitis, A. T. Ewall-Wice, A. Fagnoni, N. Acedo, E. de Lera Martinot, Z. E. Abdurashidova, Z. Adams, T. Aguirre, J. E. Baartman, R. Beardsley, A. P. Berkhout, L. M. Bernardi, G. Billings, T. S. Bowman, J. D. Bull, P. Burba, J. Byrne, R. Carey, S. Chen, K. -F. Choudhuri, S. Cox, T. DeBoer, D. R. Dexter, M. Dillon, J. S. Dynes, S. Eksteen, N. Ely, J. 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. Kern, N. S. Kerrigan, J. Kittiwisit, P. Kolopanis, M. Lanman, A. Liu, A. Ma, Y. -Z. MacMahon, D. H. E. Malan, L. Malgas, C. Malgas, K. Marero, B. McBride, L. Mesinger, A. Mohamed-Hinds, N. Molewa, M. Morales, M. F. Murray, S. G. Nikolic, B. Nuwegeld, H. Parsons, A. R. Patra, N. La Plante, P. Qin, Y. 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. van Wyngaarden, P. Zheng, H. Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics Interferometric experiments designed to detect the highly redshifted 21-cm signal from neutral hydrogen are producing increasingly stringent constraints on the 21-cm power spectrum, but some k-modes remain systematics-dominated. Mutual coupling is a major systematic that must be overcome in order to detect the 21-cm signal, and simulations that reproduce effects seen in the data can guide strategies for mitigating mutual coupling. In this paper, we analyse 12 nights of data from the Hydrogen Epoch of Reionization Array and compare the data against simulations that include a computationally efficient and physically motivated semi-analytic treatment of mutual coupling. We find that simulated coupling features qualitatively agree with coupling features in the data; however, coupling features in the data are brighter than the simulated features, indicating the presence of additional coupling mechanisms not captured by our model. We explore the use of fringe-rate filters as mutual coupling mitigation tools and use our simulations to investigate the effects of mutual coupling on a simulated cosmological 21-cm power spectrum in a "worst case" scenario where the foregrounds are particularly bright. We find that mutual coupling contaminates a large portion of the "EoR Window", and the contamination is several orders-of-magnitude larger than our simulated cosmic signal across a wide range of cosmological Fourier modes. While our fiducial fringe-rate filtering strategy reduces mutual coupling by roughly a factor of 100 in power, a non-negligible amount of coupling cannot be excised with fringe-rate filters, so more sophisticated mitigation strategies are required.
title	Investigating Mutual Coupling in the Hydrogen Epoch of Reionization Array and Mitigating its Effects on the 21-cm Power Spectrum
topic	Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics
url	https://arxiv.org/abs/2406.08549