Galaxy peculiar velocities and evolution-bias

Abstract

Galaxy bias can be split into two components: a formation-bias based on the locations of galaxy creation, and an evolution-bias that details their subsequent evolution. In this letter we consider evolution-bias in the peaks model. In this model, galaxy formation takes place at local maxima in the density field, and we analyse the subsequent peculiar motion of these galaxies in a linear model of structure formation. The peak restriction yields differences in the velocity distribution and correlation between the galaxy and the dark matter fields, which causes the evolution-bias component of the total bias to evolve in a scale-dependent way. This mechanism naturally gives rise to a change in shape between galaxy and matter correlation functions that depends on the mean age of the galaxy population. This model predicts that older galaxies would be more strongly biased on large scales compared to younger galaxies. Our arguments are supported by a Monte-Carlo simulation of galaxy pairs propagated using the Zel'dovich-approximation for describing linear peculiar galaxy motion.

5 pages, 4 figures, MNRAS accepted

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Cited by in corpus (19)

• Large-Scale Galaxy Bias
• Clustering of dark matter tracers: generalizing bias for the coming era of precision LSS
• Reconstructing the history of structure formation using redshift distortions
• Testing cosmological structure formation using redshift-space distortions
• Understanding higher-order nonlocal halo bias at large scales by combining the power spectrum with the bispectrum
• Modeling scale-dependent bias on the baryonic acoustic scale with the statistics of peaks of Gaussian random fields
• Reconstructing baryon oscillations
• Redshift space correlations and scale-dependent stochastic biasing of density peaks
• Testing Gravity Using Large-Scale Redshift-Space Distortions
• COSMIC BIRTH: Efficient Bayesian Inference of the Evolving Cosmic Web from Galaxy Surveys
• Effects of cosmological model assumptions on galaxy redshift survey measurements
• Velocity bias in the distribution of dark matter halos
• Galactic angular momenta and angular momentum couplings in the large-scale structure
• Cosmology inference at the field level from biased tracers in redshift-space
• Observational Constraints on Dynamical Dark Energy Models
• Implications of bias evolution on measurements of the integrated Sachs-Wolfe effect: errors and biases in parameter estimation
• Forecasting cosmological parameter constraints from near-future space-based galaxy surveys
• The bias of weighted dark matter halos from peak theory
• Constraining the optical depth of galaxies and velocity bias with cross-correlation between kinetic Sunyaev-Zeldovich effect and peculiar velocity field