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Article Contents

ABSTRACT

1.INTRODUCTION

2.FUNDAMENTALS
2.1.A primer on galaxy formation and evolution
2.2.A primer on weak gravitational lensing
2.3.Tidal alignment theory

3.DEVELOPMENTS OF THE TWENTIETH CENTURY
3.1.The very first works: 1914-1926
3.2.A second wave: 1938-1958
3.3.A case study: alignments in the Palomar Sky Survey
3.4.More recent observational works
3.5.Early Tidal Torque Theory
3.6.More recent theoretical and numerical progress

4.INTRA-HALO ALIGNMENTS
4.1.Alignment of the central galaxy with its halo
4.2.Alignment of satellite galaxy shapes

5.INTER-HALO AND LARGE-SCALE STRUCTURE ALIGNMENTS
5.1.Alignments between galaxy clusters
5.2.Alignments with filaments
5.3.Alignments with sheets and void surfaces

6.GALAXY ALIGNMENTS WITH THE MATTER DENSITY FIELD
6.1.General observational studies
6.2.Early-type galaxies
6.3.Late-type galaxies
6.4.Alternative alignment mechanisms

7.IMPACT ON COSMOLOGY

8.QUO VADIS?

REFERENCES