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CONFIRMATION OF WIDE-FIELD SIGNATURES IN REDSHIFTED 21 cm POWER SPECTRA

Thyagarajan, Nithyanandan; Jacobs, Daniel C.; Bowman, J D; Barry, N; Beardsley, A; Bernardi, G; Briggs, Franklin; Cappallo, Roger C; Carroll, P; Deshpande, Avinash; de Oliveira-Costa,, A; Dillon, Joshua; Ewall-Wice, Aaron; McKinley, Benjamin; Offringa, Andre; Bowman, Judd D; Greenhill, Lincoln; Hazelton, B; Johnston-Hollitt, M; Kaplan, D L; Loeb, Abraham; Oberoi, D; Prabu, T; Srivani, K. S.; Webster, Rachel L; Wyithe, J Stuart B

Description

We confirm our recent prediction of the "pitchfork" foreground signature in power spectra of high-redshift 21 cm measurements where the interferometer is sensitive to large-scale structure on all baselines. This is due to the inherent response of a wide-field instrument and is characterized by enhanced power from foreground emission in Fourier modes adjacent to those considered to be the most sensitive to the cosmological H i signal. In our recent paper, many signatures from the simulation that...[Show more]

CollectionsANU Research Publications
Date published: 2015
Type: Journal article
URI: http://hdl.handle.net/1885/102733
Source: Astrophysical Journal Letters
DOI: 10.1088/2041-8205/807/2/L28

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