The 21-cm power spectrum after reionization
Wyithe, J. Stuart B.
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CitationWyithe, J. Stuart B., and Abraham Loeb. 2009. “The 21-Cm Power Spectrum after Reionization.” Monthly Notices of the Royal Astronomical Society 397 (4): 1926–34. https://doi.org/10.1111/j.1365-2966.2009.15019.x.
AbstractWe discuss the 21-cm power spectrum (PS) following the completion of reionization. In contrast to the reionization era, this PS is proportional to the PS of mass density fluctuations, with only a small modulation due to fluctuations in the ionization field on scales larger than the mean-free-path of ionizing photons. We derive the form of this modulation, and demonstrate that its effect on the 21-cm PS will be smaller than 1 per cent for physically plausible models of damped Ly alpha systems. In contrast to the 21-cm PS observed prior to reionization, in which H ii regions dominate the ionization structure, the simplicity of the 21-cm PS after reionization will enhance its utility as a cosmological probe by removing the need to separate the PS into physical and astrophysical components. As a demonstration, we consider the Alcock-Paczynski test and show that the next generation of low-frequency arrays could measure the angular distortion of the PS at the per cent level for z similar to 3-5.
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