title: Will nonlinear peculiar velocity and inhomogeneous reionization spoil 21 cm cosmology from the epoch of reionization?
abstract: The 21 cm background from the epoch of reionization is a promising cosmological probe: line-of-sight velocity fluctuations distort redshift, so brightness fluctuations in Fourier space depend upon angle, which linear theory shows can separate cosmological from astrophysical information. Nonlinear fluctuations in ionization, density, and velocity change this, however. The validity and accuracy of the separation scheme are tested here for the first time, by detailed reionization simulations. The scheme works reasonably well early in reionization (≲40% ionized), but not late (≳80% ionized).
authors.affiliation: Department of Astronomy and Texas Cosmology Center, University of Texas, Austin, Texas 78712, USA.
authors.forename: Paul R
authors.initials: PR
authors.lastname: Shapiro
authors.affiliation: Department of Astronomy and Texas Cosmology Center, University of Texas, Austin, Texas 78712, USA and Institut Lagrange de Paris, Institut d'Astrophysique de Paris, CNRS, UPMC Université Paris 06, UMR7095, 98 bis, boulevard Arago, F-75014 Paris, France.
authors.forename: Yi
authors.initials: Y
authors.lastname: Mao
authors.affiliation: Department of Physics and Astronomy, Astronomy Centre, Pevensey II Building, University of Sussex, Falmer, Brighton BN1 9QH, United Kingdom.
authors.forename: Ilian T
authors.initials: IT
authors.lastname: Iliev
authors.affiliation: Department of Astronomy and Oskar Klein Centre, AlbaNova, Stockholm University, SE-106 91 Stockholm, Sweden.
authors.forename: Garrelt
authors.initials: G
authors.lastname: Mellema
authors.affiliation: Department of Astronomy and Oskar Klein Centre, AlbaNova, Stockholm University, SE-106 91 Stockholm, Sweden.
authors.forename: Kanan K
authors.initials: KK
authors.lastname: Datta
authors.affiliation: Department of Earth Sciences, Chosun University, Gwangju 501-759, Korea.
authors.forename: Kyungjin
authors.initials: K
authors.lastname: Ahn
authors.affiliation: Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia.
authors.forename: Jun
authors.initials: J
authors.lastname: Koda