The effect of finite halo size on the clustering of neutral hydrogen

Abstract

Post-reionisation 21cm intensity mapping experiments target the spectral line of neutral hydrogen (HI) resident in dark matter haloes. According to the halo model, these discrete haloes trace the continuous dark matter density field down to a certain scale, which is dependent on the halo physical size. The halo physical size defines an exclusion region which leaves imprints on the statistical properties of HI. We show how the effect of exclusion due to the finite halo size impacts the HI power spectrum, with the physical boundary of the host halo given by the splashback radius. Most importantly, we show that the white noise-like feature that appears in the zero-momentum limit of the power spectrum is exactly cancelled when the finite halo size is taken into consideration. This cancellation in fact applies to all tracers of dark matter density field, including galaxies. Furthermore, we show that the exclusion due to finite halo size leads to a sub-Poissonian noise signature on large scales, consistent with the results from N-body simulations

arXiv comment23 pages, 7 figures, one appendix. Version accepted for publication by JCAP

References in corpus (76)

• The Structure of Cold Dark Matter Halos
• Efficient Computation of CMB anisotropies in closed FRW models
• Large scale bias and the peak background split
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• Halo Models of Large Scale Structure
• Hierarchical Galaxy Formation
• Large-Scale Structure of the Universe and Cosmological Perturbation Theory
• An excursion set model of hierarchical clustering: Ellipsoidal collapse and the moving barrier
• Large-Scale Galaxy Bias
• The Effective Field Theory of Cosmological Large Scale Structures
• Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
• Dependence of the outer density profiles of halos on their mass accretion rate
• Clustering of dark matter tracers: generalizing bias for the coming era of precision LSS
• HMcode-2020: Improved modelling of non-linear cosmological power spectra with baryonic feedback
• Late-time cosmology with 21cm intensity mapping experiments
• The splashback radius as a physical halo boundary and the growth of halo mass
• Cosmological Constraints from a Combination of Galaxy Clustering and Lensing -- I. Theoretical Framework
• A critical look at cosmological perturbation theory techniques
• Splashback in accreting dark matter halos
• Non-linear perturbation theory extension of the Boltzmann code CLASS
• Renormalized Halo Bias
• Ingredients for 21cm intensity mapping
• The pseudo-evolution of halo mass
• Halo Stochasticity from Exclusion and non-linear Clustering
• Clustering of dark matter tracers: renormalizing the bias parameters
• HIRAX: A Probe of Dark Energy and Radio Transients
• An algorithm to build mock galaxy catalogues using MICE simulations
• On the Renormalization of the Effective Field Theory of Large Scale Structures
• Minimizing the stochasticity of halos in large-scale structure surveys
• Testing General Relativity with 21 cm intensity mapping
• A Simple Technique for Predicting High-Redshift Galaxy Evolution
• A physical upper limit on the HI column density of gas clouds
• A Fitting Formula for the Non-Linear Evolution of the Bispectrum
• Biasing and the distribution of dark matter haloes
• How to suppress the shot noise in galaxy surveys
• The splashback radius of halos from particle dynamics. II. Dependence on mass, accretion rate, redshift, and cosmology
• Limitations to the "basic'' HOD model and beyond
• The Robustness of Dark Matter Density Profiles in Dissipationless Mergers
• A new tension in the cosmological model from primordial deuterium?
• xPand: An algorithm for perturbing homogeneous cosmologies
• Peak-Background Split, Renormalization, and Galaxy Clustering
• Non-Gaussian Halo Bias Re-examined: Mass-dependent Amplitude from the Peak-Background Split and Thresholding
• On the Distribution of Haloes, Galaxies and Mass
• A halo model for cosmological neutral hydrogen: abundances and clustering
• Measurement of the Splashback Feature around SZ-selected Galaxy Clusters with DES, SPT and ACT
• Cosmological Constraints from a Combination of Galaxy Clustering & Lensing -- II. Fisher Matrix Analysis
• Probing the nature of dark matter particles with stellar streams
• MeerKLASS: MeerKAT Large Area Synoptic Survey
• Theoretical and observational constraints on the HI intensity power spectrum
• Ensemble Slice Sampling: Parallel, black-box and gradient-free inference for correlated & multimodal distributions
• Extensions to models of the galaxy-halo connection
• The Effective Field Theory of Large Scale Structure at Three Loops
• Splashback in galaxy clusters as a probe of cosmic expansion and gravity
• Flybys, orbits, splashback: subhalos and the importance of the halo boundary
• What does the Marked Power Spectrum Measure? Insights from Perturbation Theory
• The splashback radius of optically selected clusters with Subaru HSC Second Public Data Release
• Optimal Weighting in Galaxy Surveys: Application to Redshift-Space Distortions
• Shock and Splash: Gas and Dark Matter Halo Boundaries around LambdaCDM Galaxy Clusters
• A Redefinition of the Halo Boundary Leads to a Simple yet Accurate Halo Model of Large Scale Structure
• On relaxation processes in collisionless mergers
• Cross-correlation of galaxies and galaxy clusters in the Sloan Digital Sky Survey and the importance of non-Poissonian shot noise
• Halo Exclusion Criteria Impacts Halo Statistics
• Connecting Galaxies with Halos Across Cosmic Time: Stellar mass assembly distribution modeling of galaxy statistics
• Biased Tracers in Redshift Space in the EFT of Large-Scale Structure
• Impact of astrophysics on cosmology forecasts for 21 cm surveys
• Nonlinear modulation of the HI power spectrum on ultra-large scales. I
• Amending the halo model to satisfy cosmological conservation laws
• A scale dependent bias on linear scales: the case for HI intensity mapping at z=1
• Toward Accurate Modeling of the Nonlinear Matter Bispectrum: Standard Perturbation Theory and Transients from Initial Conditions
• Beyond $\Lambda$CDM with HI intensity mapping: robustness of cosmological constraints in the presence of astrophysics
• Simulating the Large-Scale Structure of HI Intensity Maps
• Optimal computation of anisotropic galaxy three point correlation function multipoles using 2DFFTLOG formalism
• Modeling assembly bias with machine learning and symbolic regression
• Imprint of non-linear effects on HI intensity mapping on large scales
• Observing Correlations Between Dark Matter Accretion and Galaxy Growth: I. Recent Star Formation Activity in Isolated Milky Way-Mass Galaxies
• Particle ejection during mergers of dark matter halos

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• zeus: A Python implementation of Ensemble Slice Sampling for efficient Bayesian parameter inference
• TheHaloMod: An online calculator for the halo model
• Constraining primordial non-Gaussianity by combining next-generation galaxy and 21 cm intensity mapping surveys
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