Direct optimal mapping for 21 cm cosmology: A demonstration with the hydrogen epoch of reionization array

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dc.contributor.authorXu, Zhilei
dc.contributor.authorHewitt, Jacqueline N.
dc.contributor.authorBull, Philip
dc.date.accessioned2023-04-18T09:26:18Z
dc.date.available2023-04-18T09:26:18Z
dc.date.issued2022
dc.description.abstractMotivated by the desire for wide-field images with well-defined statistical properties for 21 cm cosmology, we implement an optimal mapping pipeline that computes a maximum likelihood estimator for the sky using the interferometric measurement equation. We demonstrate this “direct optimal mapping” with data from the Hydrogen Epoch of Reionization (HERA) Phase I observations. After validating the pipeline with simulated data, we develop a maximum likelihood figure-of-merit for comparing four sky models at 166 MHz with a bandwidth of 100 kHz. The HERA data agree with the GLEAM catalogs (Wayth et al. 2015) to < 10%. After subtracting the GLEAM point sources, the HERA data discriminate between the different continuum sky models, providing most support for the model of Byrne et al. (2021). We report the computation cost for mapping the HERA Phase I data and project the computation for the HERA 320-antenna data; both are feasible with a modern server. The algorithm is broadly applicable to other interferometers and is valid for wide-field and non-coplanar arrays.en_US
dc.identifier.citationXu, Z. et al. (2023). Direct optimal mapping for 21 cm cosmology: A demonstration with the hydrogen epoch of reionization array. Astrophysical Journal, 938(2), art. no. 128. 10.3847/1538-4357/ac9053en_US
dc.identifier.issn1538-4357
dc.identifier.uri10.3847/1538-4357/ac9053
dc.identifier.urihttp://hdl.handle.net/10566/8829
dc.language.isoenen_US
dc.publisherAmerican Astronomical Societyen_US
dc.subjectAstronomyen_US
dc.subjectCosmologyen_US
dc.subjectAperture synthesisen_US
dc.subjectPhysicsen_US
dc.subjectRadio Astronomyen_US
dc.titleDirect optimal mapping for 21 cm cosmology: A demonstration with the hydrogen epoch of reionization arrayen_US
dc.typeArticleen_US

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