dc.contributor.author | Kern, NS | |
dc.contributor.author | Dillon, JS | |
dc.contributor.author | Parsons, AR | |
dc.contributor.author | Carilli, CL | |
dc.contributor.author | Bernardi, G | |
dc.contributor.author | Abdurashidova, Z | |
dc.contributor.author | Aguirre, JE | |
dc.contributor.author | Alexander, P | |
dc.contributor.author | Ali, ZS | |
dc.contributor.author | Balfour, Y | |
dc.contributor.author | Beardsley, AP | |
dc.contributor.author | Billings, TS | |
dc.contributor.author | Bowman, JD | |
dc.contributor.author | Bradley, RF | |
dc.contributor.author | Bull, P | |
dc.contributor.author | Burba, J | |
dc.contributor.author | Carey, S | |
dc.contributor.author | Cheng, C | |
dc.contributor.author | Deboer, DR | |
dc.contributor.author | Dexter, M | |
dc.contributor.author | De Lera Acedo, E | |
dc.contributor.author | Ely, J | |
dc.contributor.author | Ewall-Wice, A | |
dc.contributor.author | Fagnoni, N | |
dc.contributor.author | Fritz, R | |
dc.contributor.author | Furlanetto, SR | |
dc.contributor.author | Gale-Sides, K | |
dc.contributor.author | Glendenning, B | |
dc.contributor.author | Gorthi, D | |
dc.contributor.author | Greig, B | |
dc.contributor.author | Grobbelaar, J | |
dc.contributor.author | Halday, Z | |
dc.contributor.author | Hazelton, BJ | |
dc.contributor.author | Hewitt, JN | |
dc.contributor.author | Hickish, J | |
dc.contributor.author | Jacobs, DC | |
dc.contributor.author | Julius, A | |
dc.contributor.author | Kerrigan, J | |
dc.contributor.author | Kittiwisit, P | |
dc.contributor.author | Kohn, SA | |
dc.contributor.author | Kolopanis, M | |
dc.contributor.author | Lanman, A | |
dc.contributor.author | La Plante, P | |
dc.contributor.author | Lekalake, T | |
dc.contributor.author | Liu, A | |
dc.contributor.author | Macmahon, D | |
dc.contributor.author | Malan, L | |
dc.contributor.author | Malgas, C | |
dc.contributor.author | Maree, M | |
dc.contributor.author | Martinot, ZE | |
dc.contributor.author | Matsetela, E | |
dc.contributor.author | Mesinger, A | |
dc.contributor.author | Molewa, M | |
dc.contributor.author | Morales, MF | |
dc.contributor.author | Mosiane, T | |
dc.contributor.author | Murray, SG | |
dc.contributor.author | Neben, AR | |
dc.contributor.author | Nikolic, B | |
dc.contributor.author | Nunhokee, CD | |
dc.contributor.author | Patra, N | |
dc.contributor.author | Pieterse, S | |
dc.contributor.author | Pober, JC | |
dc.contributor.author | Razavi-Ghods, N | |
dc.contributor.author | Ringuette, J | |
dc.contributor.author | Robnett, J | |
dc.contributor.author | Rosie, K | |
dc.contributor.author | Sims, P | |
dc.contributor.author | Smith, C | |
dc.contributor.author | Syce, A | |
dc.contributor.author | Thyagarajan, N | |
dc.contributor.author | Williams, PKG | |
dc.contributor.author | Zheng, H | |
dc.date.accessioned | 2020-04-09T12:05:20Z | |
dc.date.available | 2020-04-09T12:05:20Z | |
dc.date.issued | 2020-02-20 | |
dc.identifier.citation | Kern, N., Dillon, J., Parsons, A., Carilli, C., Bernardi, G., & Abdurashidova, Z. et al. (2020). Absolute Calibration Strategies for the Hydrogen Epoch of Reionization Array and Their Impact on the 21 cm Power Spectrum. The Astrophysical Journal, 890(2), 122. doi: 10.3847/1538-4357/ab67bc | en_US |
dc.identifier.issn | 0004-637X | |
dc.identifier.uri | https://qmro.qmul.ac.uk/xmlui/handle/123456789/63543 | |
dc.description.abstract | We discuss absolute calibration strategies for Phase I of the Hydrogen Epoch of Reionization Array (HERA), which aims to measure the cosmological 21 cm signal from the Epoch of Reionization. HERA is a drift-scan array with a 10° wide field of view, meaning bright, well-characterized point-source transits are scarce. This, combined with HERA's redundant sampling of the uv plane and the modest angular resolution of the Phase I instrument, make traditional sky-based and self-calibration techniques difficult to implement with high dynamic range. Nonetheless, in this work, we demonstrate calibration for HERA using point-source catalogs and electromagnetic simulations of its primary beam. We show that unmodeled diffuse flux and instrumental contaminants can corrupt the gain solutions and present a gain-smoothing approach for mitigating their impact on the 21 cm power spectrum. We also demonstrate a hybrid sky and redundant calibration scheme and compare it to pure sky-based calibration, showing only a marginal improvement to the gain solutions at intermediate delay scales. Our work suggests that the HERA Phase I system can be well calibrated for a foreground avoidance power spectrum estimator by applying direction-independent gains with a small set of degrees of freedom across the frequency and time axes. | en_US |
dc.publisher | American Astronomical Society | en_US |
dc.relation.ispartof | Astrophysical Journal | |
dc.title | Absolute Calibration Strategies for the Hydrogen Epoch of Reionization Array and Their Impact on the 21 cm Power Spectrum | en_US |
dc.type | Article | en_US |
dc.rights.holder | © 2020. The American Astronomical Society. | |
dc.identifier.doi | 10.3847/1538-4357/ab67bc | |
pubs.issue | 2 | en_US |
pubs.notes | Not known | en_US |
pubs.publication-status | Published | en_US |
pubs.volume | 890 | en_US |
rioxxterms.funder | Default funder | en_US |
rioxxterms.identifier.project | Default project | en_US |