The Effect of Assembly Bias on Redshift Space Distortions

Abstract

We study potential systematic effects of assembly bias on cosmological parameter constraints from redshift space distortion measurements. We use a semi-analytic galaxy formation model applied to the Millennium N-body WMAP-7 simulation to study the effects of halo assembly bias on the redshift space distortions of the galaxy correlation function. We look at the pairwise velocities of galaxies living in haloes with concentrations and ages in the upper and lower quintiles, and find that the velocity differences between these are consistent with those reported for real-space clustering analyses, i.e. samples with higher clustering also exhibit stronger infall pairwise motions. This can also be seen in the monopole and quadrupole of the redshift-space correlation function. We find that regardless of the method of measurement, the changes in the $\beta$ parameter due to different secondary halo parameters fully tracks the change in the bias Parameter. Hence, assembly bias does not introduce detectable systematics in the inferred logarithmic growth factor.

15 pages, 12 figures.Submitted to MNRAS

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Cited by in corpus (13)

• Five-percent measurements of the growth rate from simulation-based modelling of redshift-space clustering in BOSS LOWZ
• Accurate emulator for the redshift-space power spectrum of dark matter halos and its application to galaxy power spectrum
• The manifestation of secondary halo bias on the galaxy population from IllustrisTNG300
• Cosmology with Stacked Cluster Weak Lensing and Cluster-Galaxy Cross-Correlations
• Testing the Accuracy of Halo Occupation Distribution Modelling using Hydrodynamic Simulations
• Anisotropic halo assembly bias and redshift-space distortions
• Cosmological information content in redshift-space power spectrum of SDSS-like galaxies in the quasi-nonlinear regime up to $k=0.3h$Mpc${}^{-1}$
• The Effects of Galaxy Assembly Bias on the Inference of Growth Rate from Redshift-Space Distortions
• The assembly bias of emission line galaxies
• Toward Accurate Modeling of Galaxy Clustering on Small Scales: Constraining the Galaxy-Halo Connection with Optimal Statistics
• A semi-analytic model of pairwise velocity distribution between dark matter halos
• Toward Accurate Modeling of Galaxy Clustering on Small Scales: Halo Model Extensions and Lingering Tension
• Why do semi-analytic models predict higher scatter in the stellar mass-halo mass relation than cosmological hydrodynamic simulations?