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- W4323924823 abstract "Inhomogeneous reionization enhances the 1D Lyman-$alpha$ forest power spectrum on large scales at redshifts $zgeq4$. This is due to coherent fluctuations in the ionized hydrogen fraction that arise from large-scale variations in the post-reionization gas temperature, which fade as the gas cools. It is therefore possible to use these relic fluctuations to constrain inhomogeneous reionization with the power spectrum at wavenumbers $log_{10}(k/{rm km^{-1},s})lesssim -1.5$. We use the Sherwood-Relics suite of hybrid radiation hydrodynamical simulations to perform a first analysis of new Lyman-$alpha$ forest power spectrum measurements at $4.0leq z leq 4.6$. These data extend to wavenumbers $log_{10}(k/{rm km^{-1},s})simeq -3$, with a relative uncertainty of $10$--$20$ per cent in each wavenumber bin. Our analysis returns a $2.7sigma$ preference for an enhancement in the Lyman-$alpha$ forest power spectrum at large scales, in excess of that expected for a spatially uniform ultraviolet background. This large-scale enhancement could be a signature of inhomogeneous reionization, although the statistical precision of these data is not yet sufficient for obtaining a robust detection of the relic post-reionization fluctuations. We show that future power spectrum measurements with relative uncertainties of $lesssim 2.5$ per cent should provide unambiguous evidence for an enhancement in the power spectrum on large scales." @default.
- W4323924823 created "2023-03-12" @default.
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- W4323924823 date "2023-03-09" @default.
- W4323924823 modified "2023-09-24" @default.
- W4323924823 title "Possible evidence for a large-scale enhancement in the Lyman-$alpha$ forest power spectrum at redshift $mathbf{textit{z}geq 4}$" @default.
- W4323924823 doi "https://doi.org/10.48550/arxiv.2303.05167" @default.
- W4323924823 hasPublicationYear "2023" @default.
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