Lyman-α forest power spectrum and its cross-correlation with dark matter haloes in different astrophysical models

Nakashima, Koichiro; Nishizawa, Atsushi J.; Nagamine, Kentaro; Oku, Yuri; Shimizu, Ikkoh

doi:10.1093/mnras/staf097

Lyman-α forest power spectrum and its cross-correlation with dark matter haloes in different astrophysical models

Oct 22, 2024

14 pages

Published in:

Mon.Not.Roy.Astron.Soc. 537 (2025) 2, 1343-1356

Published: Jan 20, 2025

e-Print:

2410.16740 [astro-ph.CO]

DOI:

10.1093/mnras/staf097

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Abstract: (Oxford University Press)

The Lyα forest, a series of H i absorption lines in the quasar spectra, is a powerful tool for probing the large-scale structure of the intergalactic medium. Its three-dimensional (3D) correlation and cross-correlations with quasars allow precise measurements of the baryon acoustic oscillation feature and redshift space distortions at redshifts z>2⁠. Understanding small-scale astrophysical phenomena, such as star formation and feedback, is crucial for full-shape analyses. In this study, we measure the 3D auto-power spectrum of the Lyα forest and its cross-power spectrum with haloes using hydrodynamic simulations from the gadget3-osaka code, which includes models for star formation and supernova feedback. Across five astrophysical models, we find 5−10 per cent differences among them at k>2hMpc−1 in the Lyα auto-power spectrum. The Lyα×halo cross-power spectra show even larger deviations, exceeding 10 per cent⁠. Using the fitting models presented by Arinyo-i-Prats et al. and Givans et al., we jointly fit the Lyα auto- and Lyα× halo cross-power spectra, and assess the accuracy of the estimated fσ8 parameter by comparing it with the ground truth from the simulations, varying the maximum wavenumber kmax and minimum halo mass Mh⁠. Our results demonstrate that the extended model proposed by Givans et al. provides a good fit to the simulated data at kmax≤3.0hMpc−1 for Mh>1010.5M⊙⁠. Furthermore, the model accurately reproduces the correct value of fσ8⁠, irrespective of the astrophysical models employed. This demonstrates its robustness against variations in astrophysical models.

Note:

14 pages, 8 figures

intergalactic medium
cosmological parameters
large-scale structure of Universe

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Figures(19)

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