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Galaxy shape statistics in the effective field theory

Published version
Peer-reviewed

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Authors

Vlah, Zvonimir 
Chisari, Nora Elisa 
Schmidt, Fabian 

Abstract

Abstract: Intrinsic galaxy alignments yield an important contribution to the observed statistics of galaxy shapes. The general bias expansion for galaxy sizes and shapes in three dimensions has been recently described by Vlah, Chisari & Schmidt using the general perturbative effective field theory (EFT) framework, in analogy to the clustering of galaxies. In this work, we present a formalism that uses the properties of spherical tensors to project galaxy shapes onto the observed sky in the flat-sky approximation, and compute the two-point functions at next-to-leading order as well as the leading-order three-point functions of galaxy shapes and number counts. The resulting expressions are given in forms that are convenient for efficient numerical implementation. For a source redshift distribution typical of Stage IV surveys, we find that nonlinear intrinsic alignment contributions to galaxy shape correlations become relevant at angular wavenumbers l ≳ 100.

Description

Keywords

paper, galaxy surveys, gravitational lensing, power spectrum, weak gravitational lensing

Journal Title

Journal of Cosmology and Astroparticle Physics

Conference Name

Journal ISSN

1475-7516

Volume Title

2021

Publisher

IOP Publishing