The Breakdown Scale of HI Bias Linearity

Abstract

The 21 cm intensity mapping experiments promise to obtain the large-scale distribution of HI gas at the post-reionization epoch. In order to reveal the underlying matter density fluctuations from the HI mapping, it is important to understand how HI gas traces the matter density distribution. Both nonlinear halo clustering and nonlinear effects modulating HI gas in halos may determine the scale below which the HI bias deviates from linearity. We employ three approaches to generate the mock HI density from a large-scale N-body simulation at low redshifts, and demonstrate that the assumption of HI linearity is valid at the scale corresponding to the first peak of baryon acoustic oscillations, but breaks down at $k\gtrsim 0.1h{\mathrm{Mpc}}^{-1}$. The nonlinear effects of halo clustering and HI content modulation counteract each other at small scales, and their competition results in a model-dependent "sweet-spot" redshift near $z$=1 where the HI bias is scale-independent down to small scales. We also find that the linear HI bias scales approximately linearly with redshift for $z\le 3$.

arXiv comment9 pages, 6 figures. Match the accepted version for publication at the ApJ

References in corpus (49)

• The cosmological simulation code GADGET-2
• Populating a cluster of galaxies - I. Results at z=0
• Halo Models of Large Scale Structure
• Toward a halo mass function for precision cosmology: the limits of universality
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• The Large Scale Bias of Dark Matter Halos: Numerical Calibration and Model Tests
• Large-Scale Galaxy Bias
• The Atomic to Molecular Transition in Galaxies. II: HI and H_2 Column Densities
• The Cosmological Analysis of the SDSS/BOSS data from the Effective Field Theory of Large-Scale Structure
• The Origin and Evolution of the Galaxy Mass-Metallicity Relation
• The Star Formation Law in Atomic and Molecular Gas
• Baryon Acoustic Oscillation Intensity Mapping as a Test of Dark Energy
• The size - virial radius relation of galaxies
• HI intensity mapping : a single dish approach
• Canadian Hydrogen Intensity Mapping Experiment (CHIME) Pathfinder
• The Atomic to Molecular Transition in Galaxies. I: An Analytic Approximation for Photodissociation Fronts in Finite Clouds
• Ingredients for 21cm intensity mapping
• Possibility of Precise Measurement of the Cosmological Power Spectrum With a Dedicated 21cm Survey After Reionization
• HIRAX: A Probe of Dark Energy and Radio Transients
• The Star Formation Law in Molecule-Poor Galaxies
• ELUCID - Exploring the Local Universe with reConstructed Initial Density field III: Constrained Simulation in the SDSS Volume
• Modeling the atomic-to-molecular transition in cosmological simulations of galaxy formation
• MApping the Most Massive Overdensities (MAMMOTH) II -- Discovery of an Extremely Massive Overdensity BOSS1441 at $z=2.32$
• HI as a Probe of the Large Scale Structure in the Post-Reionization Universe
• Perturbation Theory Reloaded II: Non-linear Bias, Baryon Acoustic Oscillations and Millennium Simulation In Real Space
• A halo model for cosmological neutral hydrogen: abundances and clustering
• On the Evolution of the Velocity-Mass-Size Relations of Disk-Dominated Galaxies over the Past 10 Billion Years
• MApping the Most Massive Overdensities Through Hydrogen (MAMMOTH) I: Methodology
• An Empirical Model for the Star Formation History in Dark Matter Halos
• PRIMUS: Galaxy Clustering as a Function of Luminosity and Color at 0.2<z<1
• The atomic Hydrogen content of the post-reionization Universe
• The 21cm Power Spectrum After Reionization
• Constraining the HI-Halo Mass Relation From Galaxy Clustering
• Constraining a halo model for cosmological neutral hydrogen
• Modelling the post-reionization neutral Hydrogen (\HI) bias
• Direct Measurement of the HI-Halo Mass Relation through Stacking
• The large-scale environment from cosmological simulations I: The baryonic cosmic web
• Constraining large scale HI bias using redshifted 21-cm signal from the post-reionization epoch
• Intensity mapping with neutral hydrogen and the Hidden Valley simulations
• ELUCID. VI: Cosmic variance of galaxy distribution in the local Universe
• Modelling the cosmic neutral hydrogen from DLAs and 21 cm observations
• Detecting neutral hydrogen in emission at redshift z ~ 1
• Modelling redshift-space distortion in the post-reionization $\mathrm{HI}$ 21-cm power spectrum
• Effects of long-wavelength fluctuations in large galaxy surveys
• Nonlinear modulation of the HI power spectrum on ultra-large scales. I
• Galaxy Ecosystems: gas contents, inflows and outflows
• A scale dependent bias on linear scales: the case for HI intensity mapping at z=1
• Perturbation theory for nonlinear halo power spectrum: the renormalized bias and halo bias
• Redshift Space Distortion of 21cm line at 1<z<5 with Cosmological Hydrodynamic Simulations

Cited by in corpus (7)

• Data Analysis for Precision 21 cm Cosmology
• Detection of Cosmological 21 cm Emission with the Canadian Hydrogen Intensity Mapping Experiment
• Extracting HI Astrophysics from Interferometric Intensity Mapping
• HIR4: cosmology from a simulated neutral hydrogen full sky using Horizon Run 4
• The HI Bias during the Epoch of Reionization
• Modeling Post-Reionization HI Distributions in Fuzzy Dark Matter Cosmologies Using Conditional Normalizing Flows
• Reconstructing HI power spectrum with minimal parameters using the dark matter distribution beyond halos