Galaxy alignments: An overview
Benjamin Joachimi, Marcello Cacciato, Thomas D. Kitching, Adrienne, Leonard, Rachel Mandelbaum, Bj\"orn Malte Sch\"afer, Crist\'obal Sif\'on,, Henk Hoekstra, Alina Kiessling, Donnacha Kirk, Anais Rassat
TL;DR
This paper reviews the current understanding of galaxy alignments, their observational signatures, and their implications for cosmology, highlighting historical development and future research directions.
Contribution
It provides a comprehensive overview of galaxy alignment studies, emphasizing their significance for understanding cosmic structure and upcoming research challenges.
Findings
Galaxy alignments influence weak lensing measurements.
Historical development of galaxy alignment research over 100 years.
Future observational and theoretical progress is discussed.
Abstract
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.
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