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The IA Guide: A Breakdown of Intrinsic Alignment Formalisms
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We summarize common notations and concepts in the field of Intrinsic Alignments (IA). IA refers to physical correlations involving galaxy shapes, galaxy spins, and the underlying cosmic web. Its characterization is an important aspect of modern cosmology, particularly in weak lensing analyses. This resource is both a reference for those already familiar with IA and designed to introduce someone to the field by drawing from various studies and presenting a collection of IA formalisms, estimators, modeling approaches, alternative notations, and useful references.
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Cited by 6 Pith papers
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Primordial Physics in the Nonlinear Universe: Revealing the oscillating halo bias from cosmological collider models
A binning-based IC method yields the first N-body measurements of oscillating halo bias from cosmological collider bispectra, with mass- and assembly-dependent phases fit by peak-background-split theory.
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Where Galaxies Point: First Measurement of the Large-Scale Axial Intrinsic Alignment
DES galaxy position angles show a coherent preferred axis (RA≈300°, Dec≈50°) — elliptical major and spiral minor axes aligned along it — reported as the first detection of horizon-scale axial intrinsic alignment.
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Intrinsic alignment demographics for next-generation lensing: Revealing galaxy property trends with DESI Y1 direct measurements
With over two million DESI galaxies, the bluest galaxies show zero intrinsic alignment across z=0.05 to 1.55, and red galaxy alignment is set by luminosity and colour alone, with no extra redshift dependence.
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The Environmental Dependence of Halo Intrinsic Alignments: Stronger Signals in Underdense Regions
At fixed halo mass, underdense environments produce systematically larger IA amplitudes (factor ~1.5–1.8) than overdense ones, driven by both stronger tidal alignment and greater intrinsic elongation.
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Forecasting the Impact of Source Galaxy Photometric Redshift Uncertainties on the LSST $3\times2$pt Analysis
A Fisher forecast code for LSST 3x2pt and cosmic shear shows photo-z parameter marginalization inflates contours 2 to 6 times, and maps the most impactful photo-z parameters for each cosmological parameter.
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Fully non-linear simulations of galaxy intrinsic alignments for weak lensing with the MillenniumTNG lightcone
Intrinsic galaxy alignments alter simulated weak lensing convergence statistics by 20 to 30 percent in the MillenniumTNG lightcone, with the strongest effect for massive galaxies.
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