Emulating galaxy and peculiar velocity clustering on non-linear scales

Abstract

We explore the potential of cross-correlating galaxies and peculiar velocities on non-linear scales to enhance cosmological constraints. Leveraging the \textsc{AbacusSummit} simulation suite and the halo occupation distribution (HOD) formalism, we train emulator models to describe the non-linear clustering of galaxies and velocities in redshift space. Our analysis demonstrates that combining galaxy and peculiar velocity clustering, provides tighter constraints on both HOD and cosmological parameters, particularly on ${\sigma }_8$ and $w_0$. We further apply our models to realistic mock catalogues, reproducing the expected density and peculiar velocity errors of type-Ia supernovae and Tully-Fisher/fundamental plane measurements for the combined ZTF and DESI measurements. While systematic biases arise in the HOD parameters, the cosmological constraints remain unbiased, yielding $3.8\%$ precision measurement on $f{\sigma }_8$ compared to $4.7\%$ using galaxy clustering alone. We demonstrate that, while combining tracers with realistic velocity measurements still yields improvement, the gains are diminished, highlighting the need for further efforts to reduce velocity measurement uncertainties and correct observational systematics on small scales.

References in corpus (37)

• emcee: The MCMC Hammer
• A Universal Density Profile from Hierarchical Clustering
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• The Dark Side of the Halo Occupation Distribution
• Power Spectrum Analysis of Three-Dimensional Redshift Surveys
• Galaxy Evolution from Halo Occupation Distribution Modeling of DEEP2 and SDSS Galaxy Clustering
• Overview of the Instrumentation for the Dark Energy Spectroscopic Instrument
• The Quijote simulations
• AbacusSummit: A Massive Set of High-Accuracy, High-Resolution $N$-Body Simulations
• Measuring D_A and H at z=0.35 from the SDSS DR7 LRGs using baryon acoustic oscillations
• The Aemulus Project I: Numerical Simulations for Precision Cosmology
• The $\text{Abacus}$ Cosmological $N$-body Code
• Cosmological information in the redshift-space bispectrum
• Velocity Bias from the Small Scale Clustering of SDSS-III BOSS Galaxies
• Cosmic flows in the nearby Universe: new peculiar velocities from SNe and cosmological constraints
• Full-shape cosmology analysis of SDSS-III BOSS galaxy power spectrum using emulator-based halo model: a $5\%$ determination of ${\sigma }_8$
• AbacusHOD: A highly efficient extended multi-tracer HOD framework and its application to BOSS and eBOSS data
• \textsc{CompaSO}: A new halo finder for competitive assignment to spherical overdensities
• Dissecting and Modelling Galaxy Assembly Bias
• The Redshift Space Momentum Power Spectrum II: measuring the growth rate from the combined 2MTF and 6dFGSv surveys
• The 6dF Galaxy Survey: Fundamental Plane Data
• Going Beyond the Galaxy Power Spectrum: an Analysis of BOSS Data with Wavelet Scattering Transforms
• Accurate emulator for the redshift-space power spectrum of dark matter halos and its application to galaxy power spectrum
• Improving constraints on the growth rate of structure by modelling the density-velocity cross-correlation in the 6dF Galaxy Survey
• Information content in the redshift-space galaxy power spectrum and bispectrum
• Target Selection for the DESI Peculiar Velocity Survey
• A local measurement of the growth rate from peculiar velocities and galaxy clustering correlations in the 6dF Galaxy Survey
• 2MTF - VII. 2MASS Tully-Fisher survey final data release: distances for 2,062 nearby spiral galaxies
• The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: measurement of the growth rate of structure from the small-scale clustering of the luminous red galaxy sample
• Cosmology inference at the field level from biased tracers in redshift-space
• Modelling galaxy clustering in redshift space with a Lagrangian bias formalism and $N$-body simulations
• A brief review on cosmological analysis of galaxy surveys with multiple tracers
• Improving estimates of the growth rate using galaxy-velocity correlations: a simulation study
• 2D k-th nearest neighbor statistics: a highly informative probe of galaxy clustering
• The DESI One-Percent Survey: Modelling the clustering and halo occupation of all four DESI tracers with Uchuu
• The DESI DR1 Peculiar Velocity Survey: growth rate measurements from the maximum likelihood fields method