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Low-frequency observations of the moon with the murchison widefield array

McKinley, Benjamin; Briggs, Franklin; Kaplan, D L; Greenhill, Lincoln; Bernardi, G; Bowman, J D; de Oliveira-Costa, Angelica; Tingay, Steven; Gaensler, B M; Oberoi, D; Johnston-Hollitt, M; Arcus, W; Waterson, Mark; Deshpande, Avinash; Kincaid, Barton B; Prabu, T; Rogers, Alan; Roshi, Anish; Srivani, K. S.; Whitney, Alan; Williams, Christopher L

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A new generation of low-frequency radio telescopes is seeking to observe the redshifted 21cm signal from the epoch of reionization (EoR), requiring innovative methods of calibration and imaging to overcome the difficulties of wide-field low-frequency radio interferometry. Precise calibration will be required to separate the expected small EoR signal from the strong foreground emission at the frequencies of interest between 80 and 300MHz. The Moon may be useful as a calibration source for...[Show more]

dc.contributor.authorMcKinley, Benjamin
dc.contributor.authorBriggs, Franklin
dc.contributor.authorKaplan, D L
dc.contributor.authorGreenhill, Lincoln
dc.contributor.authorBernardi, G
dc.contributor.authorBowman, J D
dc.contributor.authorde Oliveira-Costa, Angelica
dc.contributor.authorTingay, Steven
dc.contributor.authorGaensler, B M
dc.contributor.authorOberoi, D
dc.contributor.authorJohnston-Hollitt, M
dc.contributor.authorArcus, W
dc.contributor.authorWaterson, Mark
dc.contributor.authorDeshpande, Avinash
dc.contributor.authorKincaid, Barton B
dc.contributor.authorPrabu, T
dc.contributor.authorRogers, Alan
dc.contributor.authorRoshi, Anish
dc.contributor.authorSrivani, K. S.
dc.contributor.authorWhitney, Alan
dc.contributor.authorWilliams, Christopher L
dc.date.accessioned2015-12-10T23:35:13Z
dc.identifier.issn0004-6256
dc.identifier.urihttp://hdl.handle.net/1885/69764
dc.description.abstractA new generation of low-frequency radio telescopes is seeking to observe the redshifted 21cm signal from the epoch of reionization (EoR), requiring innovative methods of calibration and imaging to overcome the difficulties of wide-field low-frequency radio interferometry. Precise calibration will be required to separate the expected small EoR signal from the strong foreground emission at the frequencies of interest between 80 and 300MHz. The Moon may be useful as a calibration source for detection of the EoR signature, as it should have a smooth and predictable thermal spectrum across the frequency band of interest. Initial observations of the Moon with the Murchison Widefield Array 32 tile prototype show that the Moon does exhibit a similar trend to that expected for a cool thermally emitting body in the observed frequency range, but that the spectrum is corrupted by reflected radio emission from Earth. In particular, there is an abrupt increase in the observed flux density of the Moon within the internationally recognized frequency modulated (FM) radio band. The observations have implications for future low-frequency surveys and EoR detection experiments that will need to take this reflected emission from the Moon into account. The results also allow us to estimate the equivalent isotropic power emitted by the Earth in the FM band and to determine how bright the Earth might appear at meter wavelengths to an observer beyond our own solar system.
dc.publisherUniversity of Chicago Press
dc.rightsAuthor/s retain copyright
dc.sourceAstronomical Journal
dc.titleLow-frequency observations of the moon with the murchison widefield array
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume145
dc.date.issued2013
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.absfor091299 - Materials Engineering not elsewhere classified
local.identifier.ariespublicationf5625xPUB2113
local.type.statusPublished Version
local.contributor.affiliationMcKinley, Benjamin, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBriggs, Franklin, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationKaplan, D L, University of Wisconsin-Milwaukee
local.contributor.affiliationGreenhill, Lincoln, Harvard-Smithsonian Center for Astrophysics
local.contributor.affiliationBernardi, G, Harvard-Smithsonian Center for Astrophysics
local.contributor.affiliationBowman, J D, Arizona State University
local.contributor.affiliationde Oliveira-Costa, Angelica , Harvard-Smithsonian Center for Astrophysics
local.contributor.affiliationTingay, Steven, Curtin University of Technology
local.contributor.affiliationGaensler, B M, University of Sydney
local.contributor.affiliationOberoi, D, Tata Institute for Fundamental Research
local.contributor.affiliationJohnston-Hollitt, M, University of Wellington
local.contributor.affiliationArcus, W, Curtin University of Technology
local.contributor.affiliationWaterson, Mark, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationDeshpande, Avinash, Raman Research Institute
local.contributor.affiliationKincaid, Barton B, Haystack Observatory
local.contributor.affiliationPrabu, T, Raman Research Institute
local.contributor.affiliationRogers, Alan, Haystack Observatory
local.contributor.affiliationRoshi, Anish, Raman Research Institute
local.contributor.affiliationSrivani, K. S., Raman Research Institute
local.contributor.affiliationWhitney, Alan, Haystack Observatory
local.contributor.affiliationWilliams, Christopher L, MIT Kavli Institute for Astrophysics and Space Research
local.bibliographicCitation.issue1
local.identifier.doi10.1088/0004-6256/145/1/23
dc.date.updated2015-12-10T11:39:52Z
local.identifier.scopusID2-s2.0-84871293050
local.identifier.thomsonID000312251100023
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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