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dc.contributor.authorCook, J.H.
dc.contributor.authorTrott, Cathryn
dc.contributor.authorLine, Jack
dc.date.accessioned2023-04-19T07:40:33Z
dc.date.available2023-04-19T07:40:33Z
dc.date.issued2022
dc.identifier.citationCook, J.H. and Trott, C.M. and Line, J.L.B. 2022. Investigating the contribution of extended radio sources to the Epoch of Reionization power spectrum. Monthly Notices of the Royal Astronomical Society. 514 (1): pp. 790-805.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/91577
dc.identifier.doi10.1093/mnras/stac1330
dc.description.abstract

We investigate the contribution of extended radio sources such as Centaurus A, and Galactic supernova remnants (SNRs) to our ability to detect the statistical 21-cm signal from the Epoch of Reionisation (EoR) with the Murchison Widefield Array (MWA). These sources are typically ignored because they are in highly attenuated parts of the MWA primary beam, however, in aggregate, these sources have apparent flux densities of 10, Jy on angular scales we expect to detect the 21-cm signal. We create bespoke multicomponent 2D Gaussian models for Galactic SNRs and for Centaurus A, and simulate the visibilities for two MWA snapshot observations. We grid those visibilities and then Fourier transform them with respect to frequency, averaging them both spherically and cylindrically to produce the 1D and 2D power spectra. We compare the simulated 1D power spectra to the expected 21-$\rm {cm}$ power spectrum. We find that although these extended sources are in highly attenuated parts of the MWA primary beam pattern, collectively they have enough power (∼104-105 m mK2 it h-3, Mpc3) on EoR significant modes (| k| ≲ 0.1\, h\,\rm Mpc-1) to prohibit detection of the 21-rm cm signal (∼104 rm mK2\, ⁢ h-3,\rm Mpc3). We find that 50-90 per cent of sources must be removed in order to reduce leakage to a level of ∼ 10-20 per cent of the 21-rm cm power spectrum on EoR significant modes. The effects of wide-field extended sources will have implications on the detectability of the 21-rm cm signal for the MWA and with the future Square Kilometre Array (SKA).

dc.languageEnglish
dc.publisherOXFORD UNIV PRESS
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/CE170100013
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/FT180100321
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/LE160100031
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectAstronomy & Astrophysics
dc.subjectmethods: statistical
dc.subjecttechniques: interferometric
dc.subjectstars: supernovae: general
dc.subjectcosmology: dark ages, reionization, first stars
dc.subjectCOSMOLOGY
dc.subjectCENTAURUS
dc.subjectARRAY
dc.subjectINTERFEROMETRY
dc.subjectSUBTRACTION
dc.subjectEMISSION
dc.subjectastro-ph.CO
dc.subjectastro-ph.CO
dc.titleInvestigating the contribution of extended radio sources to the Epoch of Reionization power spectrum
dc.typeJournal Article
dcterms.source.volume514
dcterms.source.number1
dcterms.source.startPage790
dcterms.source.endPage805
dcterms.source.issn0035-8711
dcterms.source.titleMonthly Notices of the Royal Astronomical Society
dc.date.updated2023-04-19T07:40:32Z
curtin.note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. ©: 2022 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

curtin.departmentSchool of Elec Eng, Comp and Math Sci (EECMS)
curtin.accessStatusOpen access
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidTrott, Cathryn [0000-0001-6324-1766]
curtin.contributor.orcidLine, Jack [0000-0002-9130-5920]
curtin.contributor.researcheridTrott, Cathryn [B-5325-2013]
dcterms.source.eissn1365-2966
curtin.contributor.scopusauthoridTrott, Cathryn [24438609500]
curtin.repositoryagreementV3


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