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Exploring the redshift-space peculiar velocity field and its power spectrum

Dam, L, Bolejko, K ORCID: 0000-0001-7402-3836 and Lewis, GF 2021 , 'Exploring the redshift-space peculiar velocity field and its power spectrum' , Journal of Cosmology and Astroparticle Physics, vol. 2021 , pp. 1-55 , doi: 10.1088/1475-7516/2021/09/018.

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Abstract

Redshift-space distortions (RSD) generically affect any spatially-dependent observable that is mapped using redshift information. The effect on the observed clustering of galaxies is the primary example of this. This paper is devoted to another example: the effect of RSD on the apparent peculiar motions of tracers as inferred from their positions in redshift space (i.e. the observed distance). Our theoretical study is motivated by practical considerations, mainly, the direct estimation of the velocity power spectrum, which is preferably carried out using the tracer's redshift-space position (so as to avoid uncertainties in distance measurements). We formulate the redshift-space velocity field and show that RSD enters as a higher-order effect. Physically, this effect may be interpreted as a dissipative correction to the usual perfect-fluid description of dark matter. We show that the effect on the power spectrum is a damping on relatively large, quasilinear scales (

Item Type: Article
Authors/Creators:Dam, L and Bolejko, K and Lewis, GF
Keywords: cosmic flows, power spectrum, redshift surveys, galaxy clustering, cosmology
Journal or Publication Title: Journal of Cosmology and Astroparticle Physics
Publisher: Iop Publishing Ltd
ISSN: 1475-7516
DOI / ID Number: 10.1088/1475-7516/2021/09/018
Copyright Information:

Copyright 2021 IOP Publishing Ltd and Sissa Medialab

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