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• W2232100021 abstract "We develop an analytic model for galaxy intrinsic alignments (IA) based on the theory of tidal alignment. We calculate all relevant nonlinear corrections at one-loop order, including effects from nonlinear density evolution, galaxy biasing, and source density weighting. Contributions from density weighting are found to be particularly important and lead to bias dependence of the IA amplitude, even on large scales. This effect may be responsible for much of the luminosity dependence in IA observations. The increase in IA amplitude for more highly biased galaxies reflects their locations in regions with large tidal fields. We also consider the impact of smoothing the tidal field on halo scales. We compare the performance of this consistent nonlinear model in describing the observed alignment of luminous red galaxies with the linear model as well as the frequently used nonlinear alignment model, finding a significant improvement on small and intermediate scales. We also show that the cross-correlation between density and IA (the GI term) can be effectively separated into source alignment and source clustering, and we accurately model the observed alignment down to the one-halo regime using the tidal field from the fully nonlinear halo-matter cross correlation. Inside the one-halo regime, the average alignment of galaxies with density tracers no longer follows the tidal alignment prediction, likely reflecting nonlinear processes that must be considered when modeling IA on these scales. Finally, we discuss tidal alignment in the context of cosmic shear measurements." @default.
• W2232100021 created "2016-06-24" @default.
• W2232100021 creator A5044703523 @default.
• W2232100021 creator A5073278093 @default.
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• W2232100021 date "2015-08-10" @default.
• W2232100021 modified "2023-10-06" @default.
• W2232100021 title "Tidal alignment of galaxies" @default.
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• W2232100021 doi "https://doi.org/10.1088/1475-7516/2015/08/015" @default.
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