Towards a Precise Measurement of Matter Clustering: Lyman-alpha Forest Data at Redshifts 2-4

Abstract

We measure the filling factor, correlation function, and power spectrum of transmitted flux in a large sample of Lya forest spectra, comprised of 30 Keck HIRES spectra and 23 Keck LRIS spectra. We infer the linear matter power spectrum P(k) from the flux power spectrum P_F(k), using an improved version of the method of Croft et al. (1998) that accounts for the influence of z-space distortions, non- linearity, and thermal broadening on P_F(k). The evolution of the shape and amplitude of P(k) over the range z= 2-4 is consistent with gravitational instability, implying that non-gravitational fluctuations do not make a large contribution. Our fiducial measurement of P(k) comes from data with <z> = 2.72. It has amplitude Delta^2(k_p)=0.74^0.20_-0.16 at wavenumber k_p=0.03 (km/s)^-1 and is well described by a power-law of index -2.43 +/- 0.06 or by a CDM-like power spectrum with shape parameter Gamma'=1.3^+0.7_-0.5*10^-3 (km/s) at z=2.72. For Omega_m=0.4, Omega_Lam=0.6, the best-fit Gamma =0.16 (h^-1mpc)^-1, in good agreement with the 2dF Galaxy Redshift Survey, and the best-fit sigma_8=0.82 (Gamma/0.15)^-0.44. Matching the observed cluster mass function and our Delta^2(k_p) in spatially flat models requires Omega_m=0.38^+0.10_-0.08 + 2.2 (Gamma-0.15). Matching Delta^2(k_p) in COBE-normalized, flat CDM models with no tensor fluctuations requires Omega_m = (0.29 +/-0.04) n^-2.89 h_65^-1.9. The Lya forest complements other probes of P(k) by constraining a regime of redshift and lengthscale not accessible by other means, and the consistency of these inferred parameters with independent estimates provides further support for inflation, cold dark matter, and vacuum energy (abridged).

Revised version fixes error in normalization (now 1 sigma higher). ApJ in press Dec 10 issue, 34 pages, 23 postscript figures, emulateapj.sty

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• Searching for the shadows of giants II: the effect of local ionisation on the Lyman-$\alpha$ absorption signatures of protoclusters at redshift $z\sim 2.4$
• Isocurvature Fluctuations Induce Early Star Formation
• Ghost Dark Matter
• Explaining JWST star formation history at $z\sim 17$ by modifying $\Lambda$CDM
• Redshift distortions in one-dimensional power spectra
• Three- and two-point spatial correlations of IGM at $z\sim 2$: Cloud based analysis using simulations
• Cosmological bounds on masses of neutrinos and other thermal relics
• Trend Filtering -- II. Denoising Astronomical Signals with Varying Degrees of Smoothness
• Cosmic Reionization on Computers: Evolution of the Flux Power Spectrum
• Testing for Features in the Primordial Power Spectrum
• Power Spectrum and Intermittency of Ly$\alpha$ Transmitted Flux of QSO He2347-4342
• Constraining warm dark matter power spectrum using the cross-correlation of HI 21 cm signal and the Lyman-$\alpha$ forest
• Imprints of dark matter-massive neutrino interaction in upcoming post-reionization and galaxy surveys
• The Flux Auto- and Cross-Correlation of the Lyman-alpha Forest. II. Modelling Anisotropies with Cosmological Hydrodynamic Simulations
• Ly$\alpha$ Leaks and Reionization
• 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
• Non-linear evolution of the cosmological background density field as diagnostic of the cosmological reionization
• The Cosmic Microwave Background anisotropies: open problems
• TensorFlow Hydrodynamics Analysis for Ly-$\alpha$ Simulations
• Effects of Cosmic Strings on Free Streaming
• An improved model for the effect of correlated Si-III absorption on the one-dimensional Lyman-$\alpha$ forest power spectrum
• Lyman-alpha power spectrum as a probe of modified gravity
• The Statistics of Cosmological Lyman-alpha Absorption
• Testing the CMB Data for Systematic Effects
• Correlation between the Mean Matter Density and the Width of the Saturated Lyman Alpha Absorption
• Covariance of the One-Dimensional Mass Power Spectrum
• Next-generation test of cosmic inflation
• Towards characterizing dark matter subhalo perturbations in stellar streams with graph neural networks
• Evidence for overdensity around z_em > 4 quasars from the proximity effect
• Parameter estimation from Ly$\alpha$ forest in Fourier space using Information Maximising Neural Network
• Cosmic Microwave Background anisotropies: the power spectrum and beyond
• Uncertainty-Aware Neural Networks for Fuzzy Dark Matter Model Selection from \texorpdfstring{$x_{\mathrm{HI}}$}{x_HI} Measurements
• Maps of the Cosmos: The Cosmic Microwave Background
• Mapping the dark matter using weak lensing