Preprint typeset using L ATEX style emulateapj v. 6/22/04 THE INFLUENCE OF NON-UNIFORM REIONIZATION ON THE CMB
We investigate the impact of spatial variations in the ionized fraction during reionization on temperature anisotropies in the CMB. We combine simulations of large scale structure to describe the underlying density field with an analytic model based on extended Press-Schechter theory to track the re...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.254.3779 2023-05-15T18:22:49+02:00 Preprint typeset using L ATEX style emulateapj v. 6/22/04 THE INFLUENCE OF NON-UNIFORM REIONIZATION ON THE CMB Oliver Zahn Matias Zaldarriaga Lars Hernquist Matthew Mcquinn The Pennsylvania State University CiteSeerX Archives 2008 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.254.3779 http://arxiv.org/pdf/astro-ph/0503166v2.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.254.3779 http://arxiv.org/pdf/astro-ph/0503166v2.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://arxiv.org/pdf/astro-ph/0503166v2.pdf text 2008 ftciteseerx 2016-01-07T19:51:58Z We investigate the impact of spatial variations in the ionized fraction during reionization on temperature anisotropies in the CMB. We combine simulations of large scale structure to describe the underlying density field with an analytic model based on extended Press-Schechter theory to track the reionization process. We find that the power spectrum of the induced CMB anisotropies depends sensitively on the character of the reionization epoch. Models that differ in the extent of the “patchy phase ” could be distinguished by future experiments such as the Atacama Cosmology Telescope (ACT) and the South Pole Telescope (SPT). In our models, the patchy signal peaks at l ≃ 2000, where it can be four times larger than the kinetic Sunyaev-Zel’dovich (kSZ)/Ostriker-Vishniac (OV) signal (∆Ttot ≃ 2.6µK). On scales beyond l ≃ 4000 the total Doppler signal is dominated by kSZ/OV, but the patchy signal can contribute up to 30 % to the power spectrum. The effect of patchy reionization is largest on scales where the primordial CMB anisotropies dominate. Ignoring this contribution could lead to significant biases in the determination of cosmological parameters derived from CMB temperature measurements. Improvements in the theoretical modeling of the reionization epoch will become increasingly important to interpret the results of upcoming experiments. Subject headings: cosmology: theory – cosmic microwave background – large-scale structure 1. Text South pole Unknown South Pole |
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We investigate the impact of spatial variations in the ionized fraction during reionization on temperature anisotropies in the CMB. We combine simulations of large scale structure to describe the underlying density field with an analytic model based on extended Press-Schechter theory to track the reionization process. We find that the power spectrum of the induced CMB anisotropies depends sensitively on the character of the reionization epoch. Models that differ in the extent of the “patchy phase ” could be distinguished by future experiments such as the Atacama Cosmology Telescope (ACT) and the South Pole Telescope (SPT). In our models, the patchy signal peaks at l ≃ 2000, where it can be four times larger than the kinetic Sunyaev-Zel’dovich (kSZ)/Ostriker-Vishniac (OV) signal (∆Ttot ≃ 2.6µK). On scales beyond l ≃ 4000 the total Doppler signal is dominated by kSZ/OV, but the patchy signal can contribute up to 30 % to the power spectrum. The effect of patchy reionization is largest on scales where the primordial CMB anisotropies dominate. Ignoring this contribution could lead to significant biases in the determination of cosmological parameters derived from CMB temperature measurements. Improvements in the theoretical modeling of the reionization epoch will become increasingly important to interpret the results of upcoming experiments. Subject headings: cosmology: theory – cosmic microwave background – large-scale structure 1. |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Oliver Zahn Matias Zaldarriaga Lars Hernquist Matthew Mcquinn |
spellingShingle |
Oliver Zahn Matias Zaldarriaga Lars Hernquist Matthew Mcquinn Preprint typeset using L ATEX style emulateapj v. 6/22/04 THE INFLUENCE OF NON-UNIFORM REIONIZATION ON THE CMB |
author_facet |
Oliver Zahn Matias Zaldarriaga Lars Hernquist Matthew Mcquinn |
author_sort |
Oliver Zahn |
title |
Preprint typeset using L ATEX style emulateapj v. 6/22/04 THE INFLUENCE OF NON-UNIFORM REIONIZATION ON THE CMB |
title_short |
Preprint typeset using L ATEX style emulateapj v. 6/22/04 THE INFLUENCE OF NON-UNIFORM REIONIZATION ON THE CMB |
title_full |
Preprint typeset using L ATEX style emulateapj v. 6/22/04 THE INFLUENCE OF NON-UNIFORM REIONIZATION ON THE CMB |
title_fullStr |
Preprint typeset using L ATEX style emulateapj v. 6/22/04 THE INFLUENCE OF NON-UNIFORM REIONIZATION ON THE CMB |
title_full_unstemmed |
Preprint typeset using L ATEX style emulateapj v. 6/22/04 THE INFLUENCE OF NON-UNIFORM REIONIZATION ON THE CMB |
title_sort |
preprint typeset using l atex style emulateapj v. 6/22/04 the influence of non-uniform reionization on the cmb |
publishDate |
2008 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.254.3779 http://arxiv.org/pdf/astro-ph/0503166v2.pdf |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
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South pole |
op_source |
http://arxiv.org/pdf/astro-ph/0503166v2.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.254.3779 http://arxiv.org/pdf/astro-ph/0503166v2.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766202231857610752 |