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2010

Observational Limits on Patchy Reionization: Implications for B-modes

Mortonson, Michael J., Hu, Wayne

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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.

Observational Limits on Patchy Reionization: Implications for B-modes · Around

Built on

Astrophys. J. 322
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M. Zaldarriaga, S. R. Furlanetto and L. Hernquist, · 2004
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