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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ftcern:oai:cds.cern.ch:826377 2023-05-15T18:22:44+02:00 The influence of non-uniform reionization on the CMB Zahn, O Zaldarriaga, M Hernquist, L McQuinn, M 2005-03-08 http://cds.cern.ch/record/826377 eng eng http://cds.cern.ch/record/826377 astro-ph/0503166 oai:cds.cern.ch:826377 Astrophysics and Astronomy 2005 ftcern 2018-07-28T07:15:57Z 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 $l\simeq 2000$, where it can be four times larger than the kinetic Sunyaev-Zel'dovich (kSZ)/Ostriker-Vishniac (OV) signal ($\Delta T_\text{tot} \simeq 2.6 \mu K$). On scales beyond $l \simeq 4000$ the total Doppler signal is dominated by kSZ/OV, but the patchy signal can contribute up to 35% 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. Other/Unknown Material South pole CERN Document Server (CDS) South Pole |
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Astrophysics and Astronomy Zahn, O Zaldarriaga, M Hernquist, L McQuinn, M The influence of non-uniform reionization on the CMB |
topic_facet |
Astrophysics and Astronomy |
description |
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 $l\simeq 2000$, where it can be four times larger than the kinetic Sunyaev-Zel'dovich (kSZ)/Ostriker-Vishniac (OV) signal ($\Delta T_\text{tot} \simeq 2.6 \mu K$). On scales beyond $l \simeq 4000$ the total Doppler signal is dominated by kSZ/OV, but the patchy signal can contribute up to 35% 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. |
author |
Zahn, O Zaldarriaga, M Hernquist, L McQuinn, M |
author_facet |
Zahn, O Zaldarriaga, M Hernquist, L McQuinn, M |
author_sort |
Zahn, O |
title |
The influence of non-uniform reionization on the CMB |
title_short |
The influence of non-uniform reionization on the CMB |
title_full |
The influence of non-uniform reionization on the CMB |
title_fullStr |
The influence of non-uniform reionization on the CMB |
title_full_unstemmed |
The influence of non-uniform reionization on the CMB |
title_sort |
influence of non-uniform reionization on the cmb |
publishDate |
2005 |
url |
http://cds.cern.ch/record/826377 |
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South Pole |
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South Pole |
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South pole |
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South pole |
op_relation |
http://cds.cern.ch/record/826377 astro-ph/0503166 oai:cds.cern.ch:826377 |
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1766202158450999296 |