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arXiv · 1504.05456

Galaxy alignments: An overview

Benjamin Joachimi·Marcello Cacciato·Thomas D. Kitching·Adrienne Leonard·Rachel Mandelbaum·Björn Malte Schäfer·Cristóbal Sifón·Henk Hoekstra·Alina Kiessling·Donnacha Kirk·Anais Rassat
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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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Benjamin Joachimi, Marcello Cacciato, Thomas D. Kitching, Adrienne Leonard, Rachel Mandelbaum, Björn Malte Schäfer, Cristóbal Sifón, Henk Hoekstra, Alina Kiessling, Donnacha Kirk, Anais Rassat. 2015-04-21. Galaxy alignments: An overview. https://doi.org/10.1007/s11214-015-0177-4

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