Measurement of the small-scale 3D Lyman-α forest power spectrum

Abdul Karim, Marie Lynn; Armengaud, Eric; Mention, Guillaume; Chabanier, Solène; Ravoux, Corentin; Lukić, Zarija

doi:10.1088/1475-7516/2024/05/088

Title: Measurement of the small-scale 3D Lyman-α forest power spectrum

Journal Article · 16 May 2024 · Journal of Cosmology and Astroparticle Physics

DOI: https://doi.org/10.1088/1475-7516/2024/05/088 · OSTI ID:2407034

^[1];

^[1]; Mention, Guillaume ^[1];

^[2];

^[3]; Lukić, Zarija ^[2]

Université Paris-Saclay, Gif-sur-Yvette (France); Alternative Energies and Atomic Energy Commission (CEA), Gif-sur-Yvette (France)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Aix-Marseille Univ., Marseille (France); Centre National de la Recherche Scientifique (CNRS), Marseille (France). Centre for Particle Physics of Marseille (CPPM)

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. Further, 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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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2407034

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 05 Vol. 2024; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Measurement of the small-scale 3D Lyman-α forest power spectrum

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