Measurement of the small-scale 3D Lyman-α forest power spectrum
Journal of Cosmology and Astroparticle Physics(2023)
摘要
Small-scale correlations measured in the Lyman-α (Lyα) 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_ 3D, of the Lyα
forest at wavenumbers k corresponding to small, ∼ Mpc scales. In order
to estimate P_ 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 Lyα forest,
P_ 1D. This methodology exhibits a very low computational cost. We
confirm the validity of this approach through its application to Nyx
cosmological hydrodynamical simulations. Subsequently, we apply our method to
the eBOSS DR16 Lyα forest sample, providing as a proof of principle, a
first P_ 3D measurement averaged over two redshift bins z=2.2 and
z=2.4. This work highlights the potential for forthcoming P_ 3D
measurements, from upcoming large spectroscopic surveys, to untangle
degeneracies in the cosmological interpretation of P_ 1D.
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