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The effect of assembly bias on redshift space distortions.

Padilla, N. and Contreras, S. and Zehavi, I. and Baugh, C. M. and Norberg, P. (2019) 'The effect of assembly bias on redshift space distortions.', Monthly notices of the Royal Astronomical Society., 486 (1). pp. 582-595.


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.

Item Type:Article
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Publisher statement:© 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:18 March 2019
Date deposited:21 March 2019
Date of first online publication:20 March 2019
Date first made open access:No date available

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