Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.397.1926w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 397, Issue 4, pp. 1926-1934.
Astronomy and Astrophysics
Astronomy
9
Galaxies: High-Redshift, Intergalactic Medium, Diffuse Radiation
Scientific paper
We 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 Lyα systems. In contrast to the 21-cm PS observed prior to reionization, in which HII 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 ~ 3-5.
Loeb Abraham
Wyithe Stuart J. B.
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