Galaxy Alignments: An Overview

By B. Joachimi, M. Cacciato, Thomas D. Kitching, A. Leonard, Rachel Mandelbaum, B. Schäfer, C. Sifón, H. Hoekstra, Alina A. Kiessling, Donnacha Kirk and 1 more. 2015

217 citations recorded by the source corpus.

The alignments between galaxies, their underlying matter structures, and the cosmic web constitute vital ingredients for a comprehensive understanding of gravity, the nature of matter, and structure formation in the Universe. We provide an overview on the state of the art in the study of these alignment processes and their observational signatures, aimed at a non-specialist audience. The development of the field over the past one hundred years is briefly reviewed. We also discuss the impact of galaxy alignments on measurements of weak gravitational lensing, and discuss avenues for making theoretical and observational progress over the coming decade.

View Paper: https://www.semanticscholar.org/paper/758d7696c8a0a8d238c2743901218b4c38df7dd7

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Citations in the corpus

CFHTLenS revisited: assessing concordance with Planck including astrophysical systematics (2016, background): “…Huterer 2006; Bernstein & Huterer 2010; Bonnett et al. 2016) and intrinsic alignments (IA) of galaxies (e.g. Hirata & Seljak 2004; Bridle & King 2007; Joachimi et al. 2011, 2015; Troxel & Ishak 2015), along with additive and multiplicative corrections to the lensing observables, for instance due…”
KiDS-450 + 2dFLenS: Cosmological parameter constraints from weak gravitational lensing tomography and overlapping redshift-space galaxy clustering (2017, background): “The observed two-point shear correlation functions receive contributions not only from the shear but also from the intrinsic alignment of galaxies (reviewed in e.g. Joachimi et al. 2015).”
Nuisance hardened data compression for fast likelihood-free inference (2019, background): “These include non-linear physics and baryonic feedback on small scales (Rudd et al. 2008; HarnoisDéraps et al. 2015), intrinsic alignments (Joachimi et al. 2015), shape and photo-z measurement systematics (Massey et al. 2012; Mandelbaum 2018; Salvato et al. 2018), blending (Mandelbaum 2018),…”
Galaxy Alignments: Observations and Impact on Cosmology (2015, methodology): “For a general introduction and historical review of the subject we refer the reader to Joachimi et al. (2015), which summarises the basic concepts and highlights the most important developments in theory, modelling and observations.”
The first-year shear catalog of the Subaru Hyper Suprime-Cam Subaru Strategic Program Survey (2017, background): “…shapes and rather infer shear only for the ensemble of galaxies, avoiding certain systematic errors in the process. alignments of galaxy shapes (Joachimi et al. 2015; Kiessling et al. 2015; Kirk et al. 2015; Troxel & Ishak 2015) and the impact of baryonic effects on the matter power spectrum…”
KiDS-450: cosmological parameter constraints from tomographic weak gravitational lensing (2016, methodology): “…from residual systematics in the shear measurement method, intrinsic ellipticity selection biases from the object detection stage or the photometric redshift selection, or from the intrinsic alignment of nearby galaxies (see e.g. Troxel & Ishak 2015; Joachimi et al. 2015, and references therein).”
Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data (2018, background): “Intrinsic shape correlations due to tidal interactions also result in systematics in cosmic shear measurements (Hirata & Seljak 2004; Joachimi et al. 2015; Kirk et al. 2015).”