Optimal 1D Ly$\alpha$ Forest Power Spectrum Estimation -- II. KODIAQ, SQUAD & XQ-100

Abstract

We measure the 1D Ly$\alpha$ power spectrum $P_{1D}$ from Keck Observatory Database of Ionized Absorption toward Quasars (KODIAQ), The Spectral Quasar Absorption Database (SQUAD) and XQ-100 quasars using the optimal quadratic estimator. We combine KODIAQ and SQUAD at the spectrum level, but perform a separate XQ-100 estimation to control its large resolution corrections in check. Our final analysis measures $P_{1D}$ at scales $k<0.1$skm${}^{-1}$ between redshifts $z=$ 2.0 -- 4.6 using 538 quasars. This sample provides the largest number of high-resolution, high-S/N observations; and combined with the power of optimal estimator it provides exceptional precision at small scales. These small-scale modes ($k\gtrsim 0.02$skm${}^{-1}$), unavailable in Sloan Digital Sky Survey (SDSS) and Dark Energy Spectroscopic Instrument (DESI) analyses, are sensitive to the thermal state and reionization history of the intergalactic medium, as well as the nature of dark matter. As an example, a simple Fisher forecast analysis estimates that our results can improve small-scale cut off sensitivity by more than a factor of 2.

References in corpus (14)

• The DESI Experiment Part I: Science,Targeting, and Survey Design
• Can sterile neutrinos be the dark matter?
• Spatial variation in the fine-structure constant -- new results from VLT/UVES
• A Direct Precision Measurement of the Intergalactic Lyman-alpha Opacity at 2<z<4.2
• Constraint on neutrino masses from SDSS-III/BOSS Ly$\alpha$ forest and other cosmological probes
• XQ-100: A legacy survey of one hundred 3.5 < z < 4.5 quasars observed with VLT/XSHOOTER
• A consistent and robust measurement of the thermal state of the IGM at $2\le z\le 4$ from a large sample of Ly$\alpha$ forest spectra: Evidence for late and rapid HeII reionization
• The Lyman-alpha forest power spectrum from the XQ-100 Legacy Survey
• The Second Data Release of the KODIAQ Survey
• A New Precision Measurement of the Small-Scale Line-of-Sight Power Spectrum of the Ly$\alpha$ Forest
• How to estimate the 3D power spectrum of the Lyman-$\alpha$ forest
• Simulating the effect of high column density absorbers on the one-dimensional Lyman-alpha forest flux power spectrum
• Optimal 1D Ly-$\alpha$ Forest Power Spectrum Estimation I: DESI-Lite Spectra
• Measurement of redshift-space two- and three-point correlation of Ly$\alpha$ absorbers at $1.7<z<3.5$: Implications on evolution of the physical properties of IGM

Cited by in corpus (19)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Unveiling Dark Matter free-streaming at the smallest scales with high redshift Lyman-alpha forest
• The Dark Energy Spectroscopic Instrument: One-dimensional power spectrum from first Lyman-$\alpha$ forest samples with Fast Fourier Transform
• $5\sigma$ tension between Planck cosmic microwave background and eBOSS Lyman-alpha forest and constraints on physics beyond $\Lambda$CDM
• PRIYA: A New Suite of Lyman-alpha Forest Simulations for Cosmology
• Cosmological Constraints from the eBOSS Lyman-$\alpha$ Forest using the PRIYA Simulations
• Modeling the Lyman-$\alpha$ forest with Eulerian and SPH hydrodynamical methods
• A neural network emulator for the Lyman-$\alpha$ 1D flux power spectrum
• Synthetic spectra for Lyman-$\alpha$ forest analysis in the Dark Energy Spectroscopic Instrument
• Possible evidence for a large-scale enhancement in the Lyman-$\alpha$ forest power spectrum at redshift $\text{z}\ge 4$
• Measurement of the small-scale 3D Lyman-$\alpha$ forest power spectrum
• A Multi-Fidelity Emulator for the Lyman-$\alpha$ Forest Flux Power Spectrum
• A framework to measure the properties of intergalactic metal systems with two-point flux statistics
• Constraining Mixed Dark Matter models with high redshift Lyman-alpha forest data
• Particle initialization effects on Lyman-$\alpha$ forest statistics in cosmological SPH simulations
• Lognormal semi-numerical simulations of the Lyman-$\alpha$ forest: comparison with full hydrodynamic simulations
• An improved model for the effect of correlated Si-III absorption on the one-dimensional Lyman-$\alpha$ forest power spectrum
• Weighing Cosmic Structures with Clusters of Galaxies and the Intergalactic Medium
• DESI DR1 Lyα 1D power spectrum: The Fast Fourier Transform estimator measurement