Cosmology from clustering of Lyman-alpha galaxies: breaking non-gravitational Lyman-alpha radiative transfer degeneracies using the bispectrum

Abstract

Large surveys for Lyman-alpha emitting (LAE) galaxies have been proposed as a new method for measuring clustering of the galaxy population at high redshift with the goal of determining cosmological parameters. However, Lyman-alpha radiative transfer effects may modify the observed clustering of LAE galaxies in a way that mimics gravitational effects, potentially reducing the precision of cosmological constraints. For example, the effect of the linear redshift-space distortion on the power spectrum of LAE galaxies is potentially degenerate with Lyman-alpha radiative transfer effects owing to the dependence of observed flux on intergalactic medium velocity gradients. In this paper, we show that the three-point function (bispectrum) can distinguish between gravitational and non-gravitational effects, and thus breaks these degeneracies, making it possible to recover cosmological parameters from LAE galaxy surveys. Constraints on the angular diameter distance and the Hubble expansion rate can also be improved by combining power spectrum and bispectrum measurements.

19 pages, 7 figures and 6 tables

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Cited by in corpus (15)

• Large-Scale Galaxy Bias
• The Galaxy Power Spectrum and Bispectrum in Redshift Space
• Intensity Mapping across Cosmic Times with the Lyman-Alpha Line
• Precision cosmology with redshift-space bispectrum: a perturbation theory based model at one-loop order
• Cosmology with anisotropic galaxy clustering from the combination of power spectrum and bispectrum
• z~1 Lya Emitters I. The Luminosity Function
• Lyman Alpha and MgII as Probes of Galaxies and their Environments
• The impact of Lyman-$\alpha$ radiative transfer on large-scale clustering in the Illustris simulation
• Extracting bias using the cross-bispectrum: An EoR and 21 cm-[CII]-[CII] case study
• New constraints on cosmological modified gravity theories from anisotropic three-point correlation functions of BOSS DR12 galaxies
• Accuracy of cosmological parameters using the baryon acoustic scale
• A new model framework for circumgalactic Ly$\alpha$ radiative transfer constrained by galaxy-Ly$\alpha$ forest clustering
• Effects of Lyman alpha scattering in the IGM on clustering statistics of Lyman alpha emitters
• Neutrino mass constraints beyond linear order: cosmology dependence and systematic biases
• Modelling the gas kinematics of an atypical Lyman-alpha emitting compact dwarf galaxy