Statistical recovery of 21 cm visibilities and their power spectra with gaussian-constrained realizations and gibbs sampling

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dc.contributor.authorBull, Philip
dc.contributor.authorKennedy, Fraser
dc.contributor.authorWilensky, Michael J
dc.contributor.authorBurba, Jacob
dc.contributor.authorChoudhuri, Samir
dc.date.accessioned2023-06-07T13:05:30Z
dc.date.available2023-06-07T13:05:30Z
dc.date.issued2023
dc.description.abstractRadio interferometers designed to probe the 21 cm signal from Cosmic Dawn and the Epoch of Reionization must contend with systematic effects that make it difficult to achieve sufficient dynamic range to separate the 21 cm signal from foreground emission and other effects. For instance, the instrument’s chromatic response modulates the otherwise spectrally smooth foregrounds, making them difficult to model, while a significant fraction of the data must be excised due to the presence of radio-frequency interference, leaving gaps in the data. Errors in modeling the (modulated and gappy) foregrounds can easily generate spurious contamination of what should otherwise be 21 cm signal-dominated modes. Various approaches have been developed to mitigate these issues by, for example, using nonparametric reconstruction of the foregrounds, in-painting the gaps, and weighting the data to reduce the level of contamination.en_US
dc.identifier.citationKennedy, F., Bull, P., Wilensky, M.J., Burba, J. and Choudhuri, S., 2023. Statistical Recovery of 21 cm Visibilities and Their Power Spectra with Gaussian-constrained Realizations and Gibbs Sampling. The Astrophysical Journal Supplement Series, 266(2), p.23.en_US
dc.identifier.urihttps://doi.org/10.3847/1538-4365/acc324
dc.identifier.urihttp://hdl.handle.net/10566/9067
dc.language.isoenen_US
dc.publisherThe Astrophysical Journal Supplement Seriesen_US
dc.subjectRadio interferometersen_US
dc.subject21 cm signalen_US
dc.subjectGaussian-constrained realizationsen_US
dc.subjectGibbs samplingen_US
dc.subjectEpoch of Reionizationen_US
dc.titleStatistical recovery of 21 cm visibilities and their power spectra with gaussian-constrained realizations and gibbs samplingen_US
dc.typeArticleen_US

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