CMB Anisotropies due to Feedback-Regulated Inhomogeneous Reionization

Abstract

We calculate the secondary anisotropies in the CMB produced by inhomogeneous reionization from simulations in which the effects of radiative and stellar feedback effects on galaxy formation have been included. This allows to self-consistently determine the beginning ($z_i\approx 30$), the duration ($\delta z\approx 20$) and the (nonlinear) evolution of the reionization process for a critical density CDM model. In addition, from the simulated spatial distribution of ionized regions, we are able to calculate the evolution of the two-point ionization correlation function, $C_{\chi }$, and obtain the power spectrum of the anisotropies, $C_{\ell }$, in the range $5000<\ell <10^6$. The power spectrum has a broad maximum around $\ell \approx 30000$, where it reaches the value $2\times 10^{-12}$. We also show that the angular correlation function $C(\theta )$ is not Gaussian, but at separation angles rad it can be approximated by a modified Lorentzian shape; at larger separations an anticorrelation signal is predicted. Detection of signals as above will be possible with future mm-wavelength interferometers like ALMA, which appears as an optimum instrument to search for signatures of inhomogeneous reionization.

14 pages, aaspp4.sty, LaTeX, 4 figures. MNRAS, submitted

References in corpus (4)

• Cosmological Reionization by Stellar Sources
• Reionization Revisited: Secondary CMB Anisotropies and Polarization
• Inhomogeneous Reionization Regulated by Radiative and Stellar Feedbacks
• Observational Signatures of the First Luminous Objects

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• The Alcock-Paczynski test in redshifted twenty one centimeter maps
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• Secondary CMB Anisotropies from Cosmological Reionization
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• Statistics of Sunyaev-Zel'dovich Cluster Surveys
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• A Linear Perturbation Theory of Inhomogeneous Reionization
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• Morphology of the Secondary CMB Anisotropies: the Key to "Smoldering" Reionization