# Observational limits on patchy reionization: Implications for B modes

@article{Mortonson2010ObservationalLO,
title={Observational limits on patchy reionization: Implications for B modes},
author={Michael J. Mortonson and Wayne Hu},
journal={Physical Review D},
year={2010},
volume={81},
pages={067302}
}
• Published 2010
• Physics
• Physical Review D
• The recent detection of secondary CMB anisotropy by the South Pole Telescope limits temperature fluctuations from the optical depth-modulated Doppler effect to ${T}_{3000}l\sqrt{13}\ensuremath{\mu}\mathrm{K}$ at multipoles $\ensuremath{\ell}\ensuremath{\sim}3000$. This bound is the first empirical constraint on optical depth fluctuations at arcminute scales, ${\ensuremath{\tau}}_{3000}=0.001{T}_{3000}/\ensuremath{\mu}\mathrm{K}$, implying that these fluctuations are no more than a few percent… CONTINUE READING