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2023

Measurement of the small-scale 3D Lyman-$\alpha$ forest power spectrum

Abdul-Karim, Marie Lynn, Armengaud, Eric, Mention, Guillaume et al.

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Small-scale correlations measured in the Lyman-$\alpha$ (Ly$\alpha$) forest encode information about the intergalactic medium and the primordial matter power spectrum.

In this article, we present and implement a simple method to measure the 3-dimensional power spectrum, $P_{\rm 3D}$, of the Ly$\alpha$ forest at wavenumbers $k$ corresponding to small, $\sim$ Mpc scales.
In order to estimate $P_{\rm 3D}$ from sparsely and unevenly distributed data samples, we rely on averaging 1-dimensional Fourier Transforms, as previously carried out to estimate the 1-dimensional power spectrum of the Ly$\alpha$ forest, $P_{\rm 1D}$.
This methodology exhibits a very low computational cost.

Measurement of the small-scale 3D Lyman-$\alpha$ forest power spectrum · Around

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