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http://hdl.handle.net/20.500.12386/31038
Title: | Mitigating Internal Instrument Coupling for 21 cm Cosmology. II. A Method Demonstration with the Hydrogen Epoch of Reionization Array | Authors: | Kern, Nicholas S. Parsons, Aaron R. Dillon, Joshua S. Lanman, Adam E. Liu, Adrian BULL, PHILIP Ewall-Wice, Aaron Abdurashidova, Zara Aguirre, James E. Alexander, Paul Ali, Zaki S. Balfour, Yanga Beardsley, Adam P. BERNARDI, GIANNI Bowman, Judd D. Bradley, Richard F. Burba, Jacob Carilli, Chris L. Cheng, Carina DeBoer, David R. Dexter, Matt de Lera Acedo, Eloy Fagnoni, Nicolas Fritz, Randall Furlanetto, Steve R. Glendenning, Brian Gorthi, Deepthi Greig, Bradley Grobbelaar, Jasper Halday, Ziyaad Hazelton, Bryna J. Hewitt, Jacqueline N. Hickish, Jack Jacobs, Daniel C. Julius, Austin Kerrigan, Joshua Kittiwisit, Piyanat Kohn, Saul A. Kolopanis, Matthew La Plante, Paul Lekalake, Telalo MacMahon, David Malan, Lourence Malgas, Cresshim Maree, Matthys Martinot, Zachary E. Matsetela, Eunice Mesinger, Andrei Molewa, Mathakane Morales, Miguel F. Mosiane, Tshegofalang Murray, Steven G. Neben, Abraham R. Patra, Nipanjana Pieterse, Samantha Pober, Jonathan C. Razavi-Ghods, Nima Ringuette, Jon Robnett, James Rosie, Kathryn Sims, Peter Smith, Craig Syce, Angelo Thyagarajan, Nithyanandan Williams, Peter K. G. Zheng, Haoxuan |
Issue Date: | 2020 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 888 | Issue: | 2 | First Page: | 70 | Abstract: | We present a study of internal reflection and cross-coupling systematics in Phase I of the Hydrogen Epoch of Reionization Array (HERA). In a companion paper, we outlined the mathematical formalism for such systematics and presented algorithms for modeling and removing them from the data. In this work, we apply these techniques to data from HERA’s first observing season as a method demonstration. The data show evidence for systematics that, without removal, would hinder a detection of the 21 cm power spectrum for the targeted Epoch of Reionization (EoR) line-of-sight modes in the range 0.2 h <SUP>-1</SUP> Mpc<SUP>-1</SUP> < {k}<SUB>\parallel </SUB> < 0.5 h <SUP>-1</SUP> Mpc<SUP>-1</SUP>. In particular, we find evidence for nonnegligible amounts of spectral structure in the raw autocorrelations that overlaps with the EoR window and is suggestive of complex instrumental effects. Through systematic modeling on a single night of data, we find we can recover these modes in the power spectrum down to the integrated noise floor, achieving a dynamic range in the EoR window of 10<SUP>6</SUP> in power (mK<SUP>2</SUP> units) with respect to the bright galactic foreground signal. Future work with deeper integrations will help determine whether these systematics can continue to be mitigated down to EoR levels. For future observing seasons, HERA will have upgraded analog and digital hardware to better control these systematics in the field. | URI: | http://hdl.handle.net/20.500.12386/31038 | URL: | https://arxiv.org/abs/1909.11733 https://iopscience.iop.org/article/10.3847/1538-4357/ab5e8a |
ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ab5e8a | Bibcode ADS: | 2020ApJ...888...70K | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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kern20a.pdf | Published version | 6.67 MB | Adobe PDF | View/Open |
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