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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Probing reionization with LOFAR using 21-cm redshift space distortions
Monthly Notices of the Royal Astronomical Society, Volume 435, No. 1, Year 2013
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Description
One 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. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Jensen, Hannes
Sweden, Stockholm
Oskar Klein Centre
Datta, Kanan K.
Sweden, Stockholm
Oskar Klein Centre
Mellema, Garrelt
Sweden, Stockholm
Oskar Klein Centre
Chapman, Emma
United Kingdom, London
University College London
Abdalla, Fillipe Batoni
United Kingdom, London
University College London
Iliev, Ilian T.
United Kingdom, Brighton
University of Sussex
Mao, Yi
France, Paris
Institut D’astrophysique de Paris
Santos, Mario G.
Portugal, Lisbon
Instituto Superior Técnico
South Africa, Bellville
University of the Western Cape
Shapiro, Paul R.
United States, Austin
The University of Texas at Austin
Zaroubi, Saleem
Netherlands, Groningen
Kapteyn Instituut
Bernardi, Gianni
Netherlands, Groningen
Kapteyn Instituut
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Brentjens, Michiel A.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
de Bruyn, A. Ger
Netherlands, Groningen
Kapteyn Instituut
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Ciardi, Benedetta
Germany, Garching Bei Munchen
Max Planck Institute for Astrophysics
Harker, Geraint J.A.
United States, Boulder
University of Colorado Boulder
Jelić, Vibor
Netherlands, Groningen
Kapteyn Instituut
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Kazemi, Sanaz
Netherlands, Groningen
Kapteyn Instituut
Koopmans, Léon V.E.
Netherlands, Groningen
Kapteyn Instituut
Labropoulos, Panagiotis
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Martínez, Oscar M.
Netherlands, Groningen
Kapteyn Instituut
Offringa, André R.
Netherlands, Groningen
Kapteyn Instituut
Australia, Canberra
Australian National University, Mount Stromlo Observatory
Pandey, Vishhambhar N.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Schaye, Joop
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Leiden
Sterrewacht Leiden
Thomas, Rajat Mani
Netherlands, Groningen
Kapteyn Instituut
Veligatla, Vamsikrishna
Netherlands, Groningen
Kapteyn Instituut
Vedantham, Harish K.
Netherlands, Groningen
Kapteyn Instituut
Yatawatta, Sarod B.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Statistics
Citations: 67
Authors: 27
Affiliations: 14
Identifiers
Doi:
10.1093/mnras/stt1341
ISSN:
00358711
e-ISSN:
13652966
Research Areas
Cancer
Environmental