Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6650
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dc.contributor.authorPaul, Sourabh-
dc.contributor.authorSethi, S.K.-
dc.contributor.authorDwarakanath, K.S.-
dc.contributor.authorUdaya Shankar, N.-
dc.contributor.authorSubrahmanyan, Ravi-
dc.contributor.authorPrabu, T.-
dc.contributor.authorSrivani, K.S.-
dc.contributor.author+40 Co-authors-
dc.date.accessioned2017-05-22T06:37:00Z-
dc.date.available2017-05-22T06:37:00Z-
dc.date.issued2016-12-20-
dc.identifier.citationAstrophysical Journal, 2016, Vol. 833, p 213en_US
dc.identifier.issn0004-637X-
dc.identifier.issn1538-4357-(Online)-
dc.identifier.urihttp://hdl.handle.net/2289/6650-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en_US
dc.description.abstractThe detection of redshifted 21 cm emission from the epoch of reionization (EoR) is a challenging task owing to strong foregrounds that dominate the signal. In this paper, we propose a general method, based on the delay spectrum approach, to extract H i power spectra that are applicable to tracking observations using an imaging radio interferometer ("Delay Spectrum with Imaging Arrays"). Our method is based on modeling the H i signal taking into account the impact of wide field effects such as the w-term, which are then used as appropriate weights in cross-correlating the measured visibilities. Our method is applicable to any radio interferometer that tracks a phase center and could be utilized for arrays such as the Murchison Widefield Array (MWA), Low Frequency Array (LOFAR), Giant Meterwave Radio Telescope (GMRT), Donald C. Backer Precision Array for Probing the Epoch of Reionization (PAPER), and HERA. In the literature the delay spectrum approach has been implemented for near-redundant baselines using drift scan observations. In this paper we explore the scheme for non-redundant tracking arrays. This is the first application of delay spectrum methodology to such data to extract the H i signal. We analyze 3 hr of MWA tracking data on the EoR1 field. We present both two-dimensional (${k}_{\parallel },{k}_{\perp }$) and one-dimensional (k) power spectra from the analysis. Our results are in agreement with the findings of other pipelines developed to analyze the MWA EoR data.en_US
dc.language.isoenen_US
dc.publisherIOP Sciences for The American Astronomical Societyen_US
dc.relation.urihttp://adsabs.harvard.edu/abs/2016ApJ...833..p 213en_US
dc.relation.urihttp://arxiv.org/abs/1610.07003en_US
dc.relation.urihttp://dx.doi.org/10.3847/1538-4357/833/2/213en_US
dc.rights2016, The American Astronomical Society.en_US
dc.subjectCosmology: observationsen_US
dc.subjectReionization,en_US
dc.subjectInterferometric techniqueen_US
dc.subjectDark ageen_US
dc.titleDelay spectrum with phase-tracking arrays: extracting the Hi power spectrum from the epoch of reionizationen_US
dc.typeArticleen_US
Appears in Collections:Research Papers (A&A)

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