The Influence of Nonuniform 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...
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American Astronomical Society
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ftharvardudash:oai:dash.harvard.edu:1/41381782 2023-05-15T18:22:51+02:00 The Influence of Nonuniform Reionization on the CMB Zahn, Oliver Zaldarriaga, Matias Hernquist, Lars McQuinn, Matthew 2005 application/pdf http://nrs.harvard.edu/urn-3:HUL.InstRepos:41381782 https://doi.org/10.1086/431947 en_US eng American Astronomical Society The Astrophysical Journal Zahn, Oliver, Matias Zaldarriaga, Lars Hernquist, and Matthew McQuinn. 2005. “The Influence of Nonuniform Reionization on the CMB.” The Astrophysical Journal 630 (2): 657–66. https://doi.org/10.1086/431947. 0004-637X 1538-4357 http://nrs.harvard.edu/urn-3:HUL.InstRepos:41381782 doi:10.1086/431947 Journal Article 2005 ftharvardudash https://doi.org/10.1086/431947 2022-04-05T18:54:18Z 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 similar or equal to 2000, where it can be 4 times larger than the kinetic Sunyaev- Zel'dovich ( kSZ)/ Ostriker- Vishniac ( OV) signal (Delta T-tot similar or equal to 2: 6 mu K). On scales beyond l similar or equal to 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 on which 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. Accepted Manuscript Article in Journal/Newspaper South pole Harvard University: DASH - Digital Access to Scholarship at Harvard South Pole The Astrophysical Journal 630 2 657 666 |
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Harvard University: DASH - Digital Access to Scholarship at Harvard |
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ftharvardudash |
language |
English |
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 similar or equal to 2000, where it can be 4 times larger than the kinetic Sunyaev- Zel'dovich ( kSZ)/ Ostriker- Vishniac ( OV) signal (Delta T-tot similar or equal to 2: 6 mu K). On scales beyond l similar or equal to 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 on which 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. Accepted Manuscript |
format |
Article in Journal/Newspaper |
author |
Zahn, Oliver Zaldarriaga, Matias Hernquist, Lars McQuinn, Matthew |
spellingShingle |
Zahn, Oliver Zaldarriaga, Matias Hernquist, Lars McQuinn, Matthew The Influence of Nonuniform Reionization on the CMB |
author_facet |
Zahn, Oliver Zaldarriaga, Matias Hernquist, Lars McQuinn, Matthew |
author_sort |
Zahn, Oliver |
title |
The Influence of Nonuniform Reionization on the CMB |
title_short |
The Influence of Nonuniform Reionization on the CMB |
title_full |
The Influence of Nonuniform Reionization on the CMB |
title_fullStr |
The Influence of Nonuniform Reionization on the CMB |
title_full_unstemmed |
The Influence of Nonuniform Reionization on the CMB |
title_sort |
influence of nonuniform reionization on the cmb |
publisher |
American Astronomical Society |
publishDate |
2005 |
url |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:41381782 https://doi.org/10.1086/431947 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
The Astrophysical Journal Zahn, Oliver, Matias Zaldarriaga, Lars Hernquist, and Matthew McQuinn. 2005. “The Influence of Nonuniform Reionization on the CMB.” The Astrophysical Journal 630 (2): 657–66. https://doi.org/10.1086/431947. 0004-637X 1538-4357 http://nrs.harvard.edu/urn-3:HUL.InstRepos:41381782 doi:10.1086/431947 |
op_doi |
https://doi.org/10.1086/431947 |
container_title |
The Astrophysical Journal |
container_volume |
630 |
container_issue |
2 |
container_start_page |
657 |
op_container_end_page |
666 |
_version_ |
1766202271331254272 |