The intrinsic alignment of red galaxies in DES Y1 redMaPPer galaxy clusters
Clusters of galaxies trace the most non-linear peaks in the cosmic density field. The weak gravitational lensing of background galaxies by clusters can allow us to infer their masses. However, galaxies associated with the local environment of the cluster can also be intrinsically aligned due to the local tidal gradient, contaminating any cosmology
Zhou, C. et al.
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2023