Probing reionization with LOFAR (Low Frequency Array) using 21-cm redshift space distortions

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dc.contributor.authorJensen, Hannes
dc.contributor.authorDatta, Kanan K.
dc.contributor.authorSantos, Mario G.
dc.contributor.authorMellema, Garrelt
dc.contributor.authorChapman, Emma
dc.contributor.authorAbdalla, Filipe B.
dc.contributor.authorIliev, Ilian T.
dc.contributor.authorMao, Yi
dc.contributor.authorShapiro, Paul R.
dc.contributor.authorZaroubi, Saleem
dc.contributor.authorBernardi, Gianni
dc.contributor.authorBrentjens, M. A.
dc.contributor.authorde Bruyn, A. G.
dc.contributor.authorCiardi, B.
dc.contributor.authorHarker, G. J. A.
dc.contributor.authorJelić, V.
dc.contributor.authorKazemi, S.
dc.contributor.authorKoopmans, L. V. E.
dc.contributor.authorLabropoulos, P.
dc.contributor.authorMartinez, O.
dc.contributor.authorOffringa, A. R.
dc.contributor.authorPandey, V. N.
dc.contributor.authorSchaye, J.
dc.contributor.authorThomas, R. M.
dc.contributor.authorVeligatla, V.
dc.contributor.authorVedantham, H.
dc.contributor.authorYatawatta, S.
dc.date.accessioned2017-07-27T09:17:17Z
dc.date.available2017-07-27T09:17:17Z
dc.date.issued2013
dc.description.abstractOne of the most promising ways to study the epoch of reionization (EoR) is through radio observations of the redshifted 21-cm line emission from neutral hydrogen. These observations are complicated by the fact that the mapping of redshifts to line-of-sight positions is distorted by the peculiar velocities of the gas. Such distortions can be a source of error if they are not properly understood, but they also encode information about cosmology and astrophysics. We study the effects of redshift space distortions on the power spectrum of 21-cm radiation from the EoR using large-scale N-body and radiative transfer simulations. We quantify the anisotropy introduced in the 21-cm power spectrum by redshift space distortions and show how it evolves as reionization progresses and how it relates to the underlying physics. We go on to study the effects of redshift space distortions on LOFAR observations, taking instrument noise and foreground subtraction into account.We find that LOFAR should be able to directly observe the power spectrum anisotropy due to redshift space distortions at spatial scales around k ∼ 0.1Mpc−1 after 1000 h of integration time. At larger scales, sample errors become a limiting factor, while at smaller scales detector noise and foregrounds make the extraction of the signal problematic. Finally, we show how the astrophysical information contained in the evolution of the anisotropy of the 21-cm power spectrum can be extracted from LOFAR observations, and how it can be used to distinguish between different reionization scenarios.en_US
dc.description.accreditationWeb of Science
dc.identifier.citationJensen, H. et al. (2013). Probing reionization with LOFAR (Low Frequency Array) using 21-cm redshift space distortions. Monthly Notices of the Royal Astronomical Society, 435: 460–474en_US
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/10566/3114
dc.language.isoenen_US
dc.publisherOxford University Pressen_US
dc.rightsCopyright the Authors. Authors may archive the published version in their institutional repository.
dc.source.urihttp://dx.doi.org/10.1093/mnras/stt1341
dc.subjectInstrumentationen_US
dc.subjectInterferometers – methodsen_US
dc.subjectNumerical – dark agesen_US
dc.subjectReionizationen_US
dc.subjectFirst starsen_US
dc.titleProbing reionization with LOFAR (Low Frequency Array) using 21-cm redshift space distortionsen_US
dc.typeArticleen_US

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