Observational Limits on Patchy Reionization: Implications for B-modes
The recent detection of secondary CMB anisotropy by the South Pole Telescope places a conservative bound on temperature fluctuations from the optical depth-modulated Doppler effect of T_{3000} < sqrt{13} microK at multipoles l~3000. This bound is the first empirical constraint on reionization opt...
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ftdatacite:10.48550/arxiv.1001.4803 2023-05-15T18:22:43+02:00 Observational Limits on Patchy Reionization: Implications for B-modes Mortonson, Michael J. Hu, Wayne 2010 https://dx.doi.org/10.48550/arxiv.1001.4803 https://arxiv.org/abs/1001.4803 unknown arXiv https://dx.doi.org/10.1103/physrevd.81.067302 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences article-journal Article ScholarlyArticle Text 2010 ftdatacite https://doi.org/10.48550/arxiv.1001.4803 https://doi.org/10.1103/physrevd.81.067302 2022-04-01T15:16:22Z The recent detection of secondary CMB anisotropy by the South Pole Telescope places a conservative bound on temperature fluctuations from the optical depth-modulated Doppler effect of T_{3000} < sqrt{13} microK at multipoles l~3000. This bound is the first empirical constraint on reionization optical depth fluctuations at arcminute scales, tau_{3000} = 0.001 T_{3000}/microK, implying that these fluctuations are no more than a few percent of the mean. Optical depth modulation of the quadrupole source to polarization generates B-modes that are correspondingly bounded as B_{3000} = 0.003 T_{3000}. The maximal extrapolation to the l~100 gravitational wave regime yields B_{100} = 0.1 T_{3000} and remains in excess of gravitational lensing if the effective comoving size of the ionizing regions is R > 80 Mpc. If patchy reionization is responsible for much of the observed arcminute scale temperature fluctuations, current bounds on B_{100} already require R < 200 Mpc and can be expected to improve rapidly. Frequency separation of thermal Sunyaev-Zel'dovich contributions to the measured secondary anisotropy would also substantially improve the limits on optical depth fluctuations and B-modes from reionization. : 4 pages, 3 figures; submitted to Phys. Rev. D (Brief Report) Text South pole DataCite Metadata Store (German National Library of Science and Technology) South Pole |
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Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
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Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences Mortonson, Michael J. Hu, Wayne Observational Limits on Patchy Reionization: Implications for B-modes |
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Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
description |
The recent detection of secondary CMB anisotropy by the South Pole Telescope places a conservative bound on temperature fluctuations from the optical depth-modulated Doppler effect of T_{3000} < sqrt{13} microK at multipoles l~3000. This bound is the first empirical constraint on reionization optical depth fluctuations at arcminute scales, tau_{3000} = 0.001 T_{3000}/microK, implying that these fluctuations are no more than a few percent of the mean. Optical depth modulation of the quadrupole source to polarization generates B-modes that are correspondingly bounded as B_{3000} = 0.003 T_{3000}. The maximal extrapolation to the l~100 gravitational wave regime yields B_{100} = 0.1 T_{3000} and remains in excess of gravitational lensing if the effective comoving size of the ionizing regions is R > 80 Mpc. If patchy reionization is responsible for much of the observed arcminute scale temperature fluctuations, current bounds on B_{100} already require R < 200 Mpc and can be expected to improve rapidly. Frequency separation of thermal Sunyaev-Zel'dovich contributions to the measured secondary anisotropy would also substantially improve the limits on optical depth fluctuations and B-modes from reionization. : 4 pages, 3 figures; submitted to Phys. Rev. D (Brief Report) |
format |
Text |
author |
Mortonson, Michael J. Hu, Wayne |
author_facet |
Mortonson, Michael J. Hu, Wayne |
author_sort |
Mortonson, Michael J. |
title |
Observational Limits on Patchy Reionization: Implications for B-modes |
title_short |
Observational Limits on Patchy Reionization: Implications for B-modes |
title_full |
Observational Limits on Patchy Reionization: Implications for B-modes |
title_fullStr |
Observational Limits on Patchy Reionization: Implications for B-modes |
title_full_unstemmed |
Observational Limits on Patchy Reionization: Implications for B-modes |
title_sort |
observational limits on patchy reionization: implications for b-modes |
publisher |
arXiv |
publishDate |
2010 |
url |
https://dx.doi.org/10.48550/arxiv.1001.4803 https://arxiv.org/abs/1001.4803 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.1103/physrevd.81.067302 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1001.4803 https://doi.org/10.1103/physrevd.81.067302 |
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1766202131596967936 |