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Constraining the ep...
Constraining the epoch of reionization with the variance statistic : simulations of the LOFAR case
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Patil, Ajinkya H. (author)
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Zaroubi, Saleem (author)
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Chapman, Emma (author)
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Jelic, Vibor (author)
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Harker, Geraint (author)
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Abdalla, Filipe B. (author)
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Asad, Khan M. B. (author)
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Bernardi, Gianni (author)
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Brentjens, Michiel A. (author)
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de Bruyn, A. G. (author)
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Bus, Sander (author)
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Ciardi, Benedetta (author)
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Daiboo, Soobash (author)
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Fernandez, Elizabeth R. (author)
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Ghosh, Abhik (author)
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- Jensen, Hannes (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Kazemi, Sanaz (author)
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Koopmans, Leon V. E. (author)
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Labropoulos, Panagiotis (author)
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Mevius, Maaijke (author)
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Martinez, Oscar (author)
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- Mellema, Garrelt (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Offringa, Andre R. (author)
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Pandey, Vishhambhar N. (author)
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Schaye, Joop (author)
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Thomas, Rajat M. (author)
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Vedantham, Harish K. (author)
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Veligatla, Vamsikrishna (author)
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Wijnholds, Stefan J. (author)
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Yatawatta, Sarod (author)
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(creator_code:org_t)
- 2014-07-21
- 2014
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 443:2, s. 1113-1124
- Related links:
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Several 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 (z(r)) and duration (Delta z) of reionization can be constrained assuming a parametrization. We use an EoR simulation of z(r) = 7.68 and Delta(z) = 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 z(r) = 7.72(-0.18)(+0.37) and Delta z = 0.53(-0.23)(+0.12) 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- methods: statistical
- techniques: interferometric
- dark ages
- reionization
- first stars
- Astronomy
- astronomi
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Patil, Ajinkya H ...
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Zaroubi, Saleem
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Chapman, Emma
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Jelic, Vibor
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Harker, Geraint
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Abdalla, Filipe ...
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show more...
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Asad, Khan M. B.
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Bernardi, Gianni
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Brentjens, Michi ...
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de Bruyn, A. G.
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Bus, Sander
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Ciardi, Benedett ...
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Daiboo, Soobash
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Fernandez, Eliza ...
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Ghosh, Abhik
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Jensen, Hannes
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Kazemi, Sanaz
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Koopmans, Leon V ...
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Labropoulos, Pan ...
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Mevius, Maaijke
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Martinez, Oscar
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Mellema, Garrelt
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Offringa, Andre ...
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Pandey, Vishhamb ...
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Schaye, Joop
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Thomas, Rajat M.
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Vedantham, Haris ...
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Veligatla, Vamsi ...
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Wijnholds, Stefa ...
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Yatawatta, Sarod
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show less...
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Stockholm University