Power Spectrum and Intermittency of Ly$\alpha$ Transmitted Flux of QSO He2347-4342

Abstract

We have studied the power spectrum and the intermittent behavior of the fluctuations in the transmitted flux of HE2347-4342 $\mathrm{Ly}\alpha$ absorption in order to investigate if there is any discrepancy between the LCDM model with parameters given by the WMAP and observations on small scales. If the non-Gaussianity of cosmic mass field is assumed to come only from halos with an universal mass profile of the LCDM model, the non-Gaussian behavior of mass field would be effectively measured by its intermittency, because intermittency is a basic statistical feature of the cuspy structures. We have shown that the Ly$\alpha$ transmitted flux field of HE2347-4342 is significantly intermittent on small scales. With the hydrodynamic simulation, we demonstrate that the LCDM model is successful in explaining the power spectrum and intermittency of $\mathrm{Ly}\alpha$ transmitted flux. Using statistics ranging from the second to eighth order, we find no discrepancy between the LCDM model and the observed transmitted flux field, and no evidence to support the necessity of reducing the power of density perturbations relative to the standard LCDM model up to comoving scales as small as about $0.08{\mathrm{h}}^{-1}\mathrm{Mpc}$. Moreover, our simulation samples show that the intermittent exponent of the Ly$\alpha$ transmitted flux field is probably scale-dependent. This result is different from the prediction of universal mass profile with a constant index of the central cusp. The scale-dependence of the intermittent exponent indicates that the distribution of baryonic gas is decoupled from the underlying dark matter.

arXiv comment27 pages (incl. 8 figures). Accepted for publication in ApJ

References in corpus (33)

• The Structure of Cold Dark Matter Halos
• Dark Matter Substructure in Galactic Halos
• Profiles of dark haloes: evolution, scatter, and environment
• Observational evidence for self-interacting cold dark matter
• Halo Models of Large Scale Structure
• Observational and Theoretical Constraints on Singular Dark Matter Halos
• Halo Substructure And The Power Spectrum
• Towards a Precise Measurement of Matter Clustering: Lyman-alpha Forest Data at Redshifts 2-4
• The Central Mass Distribution in Dwarf and Low Surface Brightness Galaxies
• Evolution of Structure in the Intergalactic Medium and the Nature of the Ly-alpha Forest
• Inferring the dark matter power spectrum from the Lyman-alpha forest in high-resolution QSO absorption spectra
• The density profile of equilibrium and non-equilibrium dark matter halos
• Cosmological Parameters from Eigenmode Analysis of Sloan Digital Sky Survey Galaxy Redshifts
• The Distribution of Column Densities and b Values in the Lyman-Alpha Forest
• High-Resolution Measurements of the Dark Matter Halo of NGC 2976: Evidence for a Shallow Density Profile
• Annihilating Cold Dark Matter
• The power spectrum of the flux distribution in the Lyman-alpha forest of a Large sample of UVES QSO Absorption Spectra (LUQAS)
• Dependence of the Inner DM Profile on the Halo Mass
• A Study of the Reionization History of Intergalactic Helium with FUSE and VLT
• A Limit on the Cosmological Mass Density and Power Spectrum from the Rotation Curves of Low Surface Brightness Galaxies
• A Hybrid Cosmological Hydrodynamic/N-body Code Based on a Weighted Essentially Non-Oscillatory Scheme
• Abundance of substructure in clusters of galaxies
• Measuring the galaxy power spectrum and scale-scale correlations with multiresolution-decomposed covariance -- I. method
• Temperature and Entropy Fields of Baryonic Gas in the Universe
• Distributions of the Baryon Fraction on Large Scales in the Universe
• Intermittent Features of the QSO Ly$\alpha$ Transmitted Flux: Results from Hydrodynamic Cosmological Simulations
• Intermittent behavior of cosmic mass field revealed by QSO's Ly_alpha forests
• Non-Gaussian Features of Transmitted Flux of QSO's Ly$\alpha$ Absorption: Intermittent Exponent
• Power spectrum and intermittency of the transmitted flux of QSOs Ly-alpha absorption spectra
• Hydrogen Clouds before Reionization: a Lognormal Model Approach
• The velocity field of baryonic gas in the universe
• The Statistical Discrepancy between the IGM and Dark Matter Fields: One-Point Statistics
• On the Normalization of the QSO's Lyman alpha Forest Power Spectrum

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