Constraining the epoch of reionization with the variance statistic: Simulations of the LOFAR case

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dc.contributor.authorPatil, Ajinkya
dc.contributor.authorZaroubi, Saleem
dc.contributor.authorChapman, Emma
dc.contributor.authorJelic, Vibor
dc.contributor.authorHarker, Geraint
dc.contributor.authorAbdalla, Filipe B.
dc.contributor.authorAsad, Khan
dc.contributor.authorBernardi, Gianni
dc.contributor.authorBrentjens, Michiel A.
dc.contributor.authorde Bruyn, A. G.
dc.contributor.authorBus, Sander
dc.contributor.authorOffringa, Andre
dc.date.accessioned2015-12-13T22:30:46Z
dc.date.issued2014
dc.date.updated2015-12-11T08:56:30Z
dc.description.abstractSeveral experiments are underway to detect the cosmic-redshifted 21-cm signal from neutral hydrogen from the Epoch of Reionization (EoR). Due to their very low signal-to-noise ratio, these observations aim for a statistical detection of the signal by measuring its power spectrum. We investigate the extraction of the variance of the signal as a first step towards detecting and constraining the global history of the EoR. Signal variance is the integral of the signal's power spectrum, and it is expected to be measured with a high significance. We demonstrate this through results from a simulation and parameter estimation pipeline developed for the Low-Frequency Array (LOFAR)-EoR experiment. We show that LOFAR should be able to detect the EoR in 600 h of integration using the variance statistic. Additionally, the redshift (zr) and duration (Δz) of reionization can be constrained assuming a parametrization. We use an EoR simulation of zr = 7.68 and Δz = 0.43 to test the pipeline. We are able to detect the simulated signal with a significance of four standard deviations and extract the EoR parameters as zr = 7.72+0.37 -0.18 and Δz = 0.53+0.12 -0.23 in 600 h, assuming that systematic errors can be adequately controlled. We further show that the significance of detection and constraints on EoR parameters can be improved by measuring the cross-variance of the signal by cross-correlating consecutive redshift bins.
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/74991
dc.publisherBlackwell Publishing Ltd
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleConstraining the epoch of reionization with the variance statistic: Simulations of the LOFAR case
dc.typeJournal article
local.bibliographicCitation.issue2
local.bibliographicCitation.lastpage1124
local.bibliographicCitation.startpage1113
local.contributor.affiliationPatil, Ajinkya, University of Groningen
local.contributor.affiliationZaroubi, Saleem, University of Groningen
local.contributor.affiliationChapman, Emma, University College London
local.contributor.affiliationJelic, VIBOR, ASTRON
local.contributor.affiliationHarker, Geraint, University of Colorado
local.contributor.affiliationAbdalla, Filipe B, University College London
local.contributor.affiliationAsad, Khan, University of Groningen
local.contributor.affiliationBernardi, Gianni, SKA SA
local.contributor.affiliationBrentjens, Michiel A, ASTRON
local.contributor.affiliationde Bruyn, A G, University of Groningen Kapteyn Astronomical Institute
local.contributor.affiliationBus, Sander, University of Groningen
local.contributor.affiliationOffringa, Andre, College of Physical and Mathematical Sciences, ANU
local.contributor.authoremailrepository.admin@anu.edu.au
local.contributor.authoruidOffringa, Andre, u5259282
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
local.identifier.ariespublicationU3488905xPUB4412
local.identifier.citationvolume443
local.identifier.doi10.1093/mnras/stu1178
local.identifier.scopusID2-s2.0-84905641386
local.identifier.uidSubmittedByU3488905
local.type.statusPublished Version

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