The local PNG bias of neutral Hydrogen, ${\mathrm{H}}_{\mathrm{I}}$

Abstract

We use separate universe simulations with the IllustrisTNG galaxy formation model to predict the local PNG bias parameters $b_{\varphi }$ and $b_{\varphi \delta }$ of atomic neutral hydrogen, ${\mathrm{H}}_{\mathrm{I}}$. These parameters and their relation to the linear density bias parameter $b_1$ play a key role in observational constraints of the local PNG parameter $f_{\mathrm{NL}}$ using the ${\mathrm{H}}_{\mathrm{I}}$ power spectrum and bispectrum. Our results show that the popular calculation based on the universality of the halo mass function overpredicts the $b_{\varphi }(b_1)$ and $b_{\varphi \delta }(b_1)$ relations measured in the simulations. In particular, our results show that at $z\lesssim 1$ the ${\mathrm{H}}_{\mathrm{I}}$ power spectrum is more sensitive to $f_{\mathrm{NL}}$ compared to previously thought ($b_{\varphi }$ is more negative), but is less sensitive at other epochs ($b_{\varphi }$ is less positive). We discuss how this can be explained by the competition of physical effects such as that large-scale gravitational potentials with local PNG (i) accelerate the conversion of hydrogen to heavy elements by star formation, (ii) enhance the effects of baryonic feedback that eject the gas to regions more exposed to ionizing radiation, and (iii) promote the formation of denser structures that shield the ${\mathrm{H}}_{\mathrm{I}}$ more efficiently. Our numerical results can be used to revise existing forecast studies on $f_{\mathrm{NL}}$ using 21cm line-intensity mapping data. Despite this first step towards predictions for the local PNG bias parameters of ${\mathrm{H}}_{\mathrm{I}}$, we emphasize that more work is needed to assess their sensitivity on the assumed galaxy formation physics and ${\mathrm{H}}_{\mathrm{I}}$ modeling strategy.

arXiv comment13 pages, 5 figures, 1 table. Comments welcomed! v2 matches version published in JCAP

References in corpus (68)

• E pur si muove: Galiliean-invariant cosmological hydrodynamical simulations on a moving mesh
• Cosmological SPH simulations: A hybrid multi-phase model for star formation
• Simulating Galaxy Formation with the IllustrisTNG Model
• First results from the IllustrisTNG simulations: matter and galaxy clustering
• Toward a halo mass function for precision cosmology: the limits of universality
• First results from the IllustrisTNG simulations: the stellar mass content of groups and clusters of galaxies
• First results from the IllustrisTNG simulations: the galaxy color bimodality
• First results from the IllustrisTNG simulations: A tale of two elements -- chemical evolution of magnesium and europium
• Simulating galaxy formation with black hole driven thermal and kinetic feedback
• Non-Gaussianity from Inflation: Theory and Observations
• First results from the IllustrisTNG simulations: radio haloes and magnetic fields
• Acoustic Signatures in the Primary Microwave Background Bispectrum
• First Results from the TNG50 Simulation: Galactic outflows driven by supernovae and black hole feedback
• The Large Scale Bias of Dark Matter Halos: Numerical Calibration and Model Tests
• A model for cosmological simulations of galaxy formation physics
• First Results from the TNG50 Simulation: The evolution of stellar and gaseous disks across cosmic time
• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• Large-Scale Galaxy Bias
• Primordial Non-Gaussianities from Inflation Models
• Constraints on local primordial non-Gaussianity from large scale structure
• The Atomic to Molecular Transition in Galaxies. II: HI and H_2 Column Densities
• The HIPASS catalogue: Omega_HI and environmental effects on the HI mass function of galaxies
• Damped Lyman Alpha Systems at z<1.65: The Expanded SDSS HST Sample
• On the (Non)Evolution of HI Disks over Cosmic Time
• Cosmology with Phase 1 of the Square Kilometre Array; Red Book 2018: Technical specifications and performance forecasts
• The Arecibo Legacy Fast ALFA Survey: X. The HI Mass Function and Omega_HI From the 40% ALFALFA Survey
• 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
• The Atomic-to-Molecular Transition in Galaxies. III. A New Method for Determining the Molecular Content of Primordial and Dusty Clouds
• HIRAX: A Probe of Dark Energy and Radio Transients
• Precision measurement of the local bias of dark matter halos
• The HI content of star-forming galaxies at z = 0.24
• Line-Intensity Mapping: 2017 Status Report
• Large-scale non-Gaussian mass function and halo bias: tests on N-body simulations
• Primordial non-Gaussianity: large-scale structure signature in the perturbative bias model
• Structure formation from non-Gaussian initial conditions: multivariate biasing, statistics, and comparison with N-body simulations
• Detection of HI in distant galaxies using spectral stacking
• Ultra large-scale cosmology in next-generation experiments with single tracers
• Constraining ultra large-scale cosmology with multiple tracers in optical and radio surveys
• Redshift-weighted constraints on primordial non-Gaussianity from the clustering of the eBOSS DR14 quasars in Fourier space
• Atomic and molecular gas in IllustrisTNG galaxies at low redshift
• Modeling the atomic-to-molecular transition in cosmological simulations of galaxy formation
• Hunting down horizon-scale effects with multi-wavelength surveys
• Galaxy Bias and Primordial Non-Gaussianity
• Cosmology on Ultralarge Scales with Intensity Mapping of the Neutral Hydrogen 21 cm Emission: Limits on Primordial Non-Gaussianity
• Primordial Non-Gaussianity from Biased Tracers: Likelihood Analysis of Real-Space Power Spectrum and Bispectrum
• A User's Guide to Extracting Cosmological Information from Line-Intensity Maps
• Cosmology with intensity mapping techniques using atomic and molecular lines
• Verifying the consistency relation for the scale-dependent bias from local primordial non-Gaussianity
• On the impact of galaxy bias uncertainties on primordial non-Gaussianity constraints
• Galaxy bias and primordial non-Gaussianity: insights from galaxy formation simulations with IllustrisTNG
• deep21: a Deep Learning Method for 21cm Foreground Removal
• The BINGO Project I: Baryon Acoustic Oscillations from Integrated Neutral Gas Observations
• Line intensity mapping with [CII] and CO(1-0) as probes of primordial non-Gaussianity
• Forecasts on Primordial non-Gaussianity from 21 cm Intensity Mapping experiments
• Predictions for local PNG bias in the galaxy power spectrum and bispectrum and the consequences for $f_{\mathrm{NL}}$ constraints
• The Hunt for Primordial Interactions in the Large Scale Structures of the Universe
• Deep 21-cm HI Observations at z~0.1: The Precursor to the Arecibo Ultra Deep Survey
• Precision Tests of CO and [CII] Power Spectra Models against Simulated Intensity Maps
• Synergies between intensity maps of hydrogen lines
• The degeneracy between primordial non-Gaussianity and foregrounds in 21cm intensity mapping experiments
• Responses of Halo Occupation Distributions: a new ingredient in the halo model & the impact on galaxy bias
• Coupling parsec and gigaparsec scales: primordial non-Gaussianity with multi-tracer intensity mapping
• The clustering of galaxies in the completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Primordial non-Gaussianity in Fourier Space
• Probing primordial non-Gaussianity with the power spectrum and bispectrum of future 21cm intensity maps
• Beyond $\Lambda$CDM with HI intensity mapping: robustness of cosmological constraints in the presence of astrophysics
• Measuring ultra-large scale effects in the presence of 21cm intensity mapping foregrounds

Cited by in corpus (9)

• Can we actually constrain $f_{\mathrm{NL}}$ using the scale-dependent bias effect? An illustration of the impact of galaxy bias uncertainties using the BOSS DR12 galaxy power spectrum
• Assembly bias in the local PNG halo bias and its implication for $f_{\mathrm{NL}}$ constraints
• PNG-UNITsims: Halo clustering response to primordial non-Gaussianities as a function of mass
• Constraining primordial non-Gaussianity by combining next-generation galaxy and 21 cm intensity mapping surveys
• Validating galaxy clustering models with Fixed & Paired and Matched-ICs simulations: application to Primordial Non-Gaussianities
• Unveiling the Universe with Emerging Cosmological Probes
• Non-Gaussian assembly bias from a semi-analytic galaxy formation model
• Constraining primordial non-Gaussianity by combining photometric galaxy and 21cm intensity mapping surveys
• Multi-tracing the primordial Universe with future surveys