The Effect of Assembly Bias on Redshift Space Distortions

Padilla, N; Contreras, S; Zehavi, I; Baugh, CM; Norberg, P

doi:10.1093/mnras/stz824

The Effect of Assembly Bias on Redshift Space Distortions

Padilla, N; Contreras, S; Zehavi, I; Baugh, CM; Norberg, P

Authors

N Padilla

S Contreras

I Zehavi

Professor Carlton Baugh c.m.baugh@durham.ac.uk
Professor

Professor Peder Norberg peder.norberg@durham.ac.uk
Professor

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 β 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.

Citation

Padilla, N., Contreras, S., Zehavi, I., Baugh, C., & Norberg, P. (2019). The Effect of Assembly Bias on Redshift Space Distortions. Monthly Notices of the Royal Astronomical Society, 486(1), 582-595. https://doi.org/10.1093/mnras/stz824

Journal Article Type	Article
Acceptance Date	Mar 18, 2019
Online Publication Date	Mar 20, 2019
Publication Date	Jun 30, 2019
Deposit Date	Mar 21, 2019
Publicly Available Date	Apr 11, 2019
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	486
Issue	1
Pages	582-595
DOI	https://doi.org/10.1093/mnras/stz824