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http://hdl.handle.net/20.500.12386/32538
Title: | Validation of the HERA Phase I Epoch of Reionization 21 cm Power Spectrum Software Pipeline | Authors: | Aguirre, James E. Murray, Steven G. Pascua, Robert Martinot, Zachary E. Burba, Jacob Dillon, Joshua S. Jacobs, Daniel C. Kern, Nicholas S. Kittiwisit, Piyanat Kolopanis, Matthew Lanman, Adam Liu, Adrian Whitler, Lily Abdurashidova, Zara Alexander, Paul Ali, Zaki S. Balfour, Yanga Beardsley, Adam P. BERNARDI, GIANNI Billings, Tashalee S. Bowman, Judd D. Bradley, Richard F. BULL, PHILIP Carey, Steve Carilli, Chris L. Cheng, Carina DeBoer, David R. Dexter, Matt de Lera Acedo, Eloy Ely, John Ewall-Wice, Aaron Fagnoni, Nicolas Fritz, Randall Furlanetto, Steven R. Gale-Sides, Kingsley Glendenning, Brian Gorthi, Deepthi Greig, Bradley Grobbelaar, Jasper Halday, Ziyaad Hazelton, Bryna J. Hewitt, Jacqueline N. Hickish, Jack Julius, Austin Kerrigan, Joshua Kohn, Saul A. La Plante, Paul Lekalake, Telalo Lewis, David MacMahon, David Malan, Lourence Malgas, Cresshim Maree, Matthys Matsetela, Eunice Mesinger, Andrei Molewa, Mathakane Morales, Miguel F. Mosiane, Tshegofalang Neben, Abraham R. Nikolic, Bojan Parsons, Aaron R. Patra, Nipanjana Pieterse, Samantha Pober, Jonathan C. Razavi-Ghods, Nima Ringuette, Jon Robnett, James Rosie, Kathryn Santos, Mario G. Sims, Peter Singh, Saurabh Smith, Craig Syce, Angelo Thyagarajan, Nithyanandan Williams, Peter K. G. Zheng, Haoxuan HERA Collaboration |
Issue Date: | 2022 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 924 | Issue: | 2 | First Page: | 85 | Abstract: | We describe the validation of the HERA Phase I software pipeline by a series of modular tests, building up to an end-to-end simulation. The philosophy of this approach is to validate the software and algorithms used in the Phase I upper-limit analysis on wholly synthetic data satisfying the assumptions of that analysis, not addressing whether the actual data meet these assumptions. We discuss the organization of this validation approach, the specific modular tests performed, and the construction of the end-to-end simulations. We explicitly discuss the limitations in scope of the current simulation effort. With mock visibility data generated from a known analytic power spectrum and a wide range of realistic instrumental effects and foregrounds, we demonstrate that the current pipeline produces power spectrum estimates that are consistent with known analytic inputs to within thermal noise levels (at the 2σ level) for k > 0.2h Mpc<SUP>-1</SUP> for both bands and fields considered. Our input spectrum is intentionally amplified to enable a strong "detection" at k ~ 0.2 h Mpc<SUP>-1</SUP>-at the level of ~25σ-with foregrounds dominating on larger scales and thermal noise dominating at smaller scales. Our pipeline is able to detect this amplified input signal after suppressing foregrounds with a dynamic range (foreground to noise ratio) of ≳10<SUP>7</SUP>. Our validation test suite uncovered several sources of scale-independent signal loss throughout the pipeline, whose amplitude is well-characterized and accounted for in the final estimates. We conclude with a discussion of the steps required for the next round of data analysis. | URI: | http://hdl.handle.net/20.500.12386/32538 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ac32cd https://api.elsevier.com/content/abstract/scopus_id/85123510225 |
ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ac32cd | Bibcode ADS: | 2022ApJ...924...85A | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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aguirre22.pdf | Pdf editoriale | 4.67 MB | Adobe PDF | View/Open |
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