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...
Main Authors: | , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
arXiv
2005
|
Subjects: | |
Online Access: | https://dx.doi.org/10.48550/arxiv.astro-ph/0503166 https://arxiv.org/abs/astro-ph/0503166 |
id |
ftdatacite:10.48550/arxiv.astro-ph/0503166 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.48550/arxiv.astro-ph/0503166 2023-05-15T18:22:49+02:00 The influence of non-uniform reionization on the CMB Zahn, Oliver Zaldarriaga, Matias Hernquist, Lars McQuinn, Matthew 2005 https://dx.doi.org/10.48550/arxiv.astro-ph/0503166 https://arxiv.org/abs/astro-ph/0503166 unknown arXiv https://dx.doi.org/10.1086/431947 Assumed arXiv.org perpetual, non-exclusive license to distribute this article for submissions made before January 2004 http://arxiv.org/licenses/assumed-1991-2003/ Astrophysics astro-ph FOS Physical sciences article-journal Article ScholarlyArticle Text 2005 ftdatacite https://doi.org/10.48550/arxiv.astro-ph/0503166 https://doi.org/10.1086/431947 2022-04-01T16:18:40Z 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 ($ΔT_{\rm tot} \simeq 2.6 μK$). On scales beyond $l \simeq 4000$ 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. : 12 pages, 9 figures, minor changes, replaced to match version in press at ApJ Text South pole DataCite Metadata Store (German National Library of Science and Technology) South Pole |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Astrophysics astro-ph FOS Physical sciences |
spellingShingle |
Astrophysics astro-ph FOS Physical sciences Zahn, Oliver Zaldarriaga, Matias Hernquist, Lars McQuinn, Matthew The influence of non-uniform reionization on the CMB |
topic_facet |
Astrophysics astro-ph FOS Physical sciences |
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 ($ΔT_{\rm tot} \simeq 2.6 μK$). On scales beyond $l \simeq 4000$ 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. : 12 pages, 9 figures, minor changes, replaced to match version in press at ApJ |
format |
Text |
author |
Zahn, Oliver Zaldarriaga, Matias Hernquist, Lars McQuinn, Matthew |
author_facet |
Zahn, Oliver Zaldarriaga, Matias Hernquist, Lars McQuinn, Matthew |
author_sort |
Zahn, Oliver |
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 |
publisher |
arXiv |
publishDate |
2005 |
url |
https://dx.doi.org/10.48550/arxiv.astro-ph/0503166 https://arxiv.org/abs/astro-ph/0503166 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.1086/431947 |
op_rights |
Assumed arXiv.org perpetual, non-exclusive license to distribute this article for submissions made before January 2004 http://arxiv.org/licenses/assumed-1991-2003/ |
op_doi |
https://doi.org/10.48550/arxiv.astro-ph/0503166 https://doi.org/10.1086/431947 |
_version_ |
1766202236509093888 |