Model-Independent Assessments of Tidal Alignment and Density-Weighting Dependence in Galaxy Intrinsic Alignments
Abstract
Intrinsic alignments (IA) of galaxies are an important source of systematic uncertainty in weak gravitational lensing measurements and also serve as a test for models of galaxy formation and evolution. These galaxy alignments are usually modeled assuming that the IA are sourced by the tidal fields around the galaxies. However, galaxy properties, like their proximity to other galaxies and their mass, provide alignment contributions beyond the tidal field. In this work, we perform novel model-agnostic tests to determine the impact of density-weighting on the IA of galaxies using data from the IllustrisTNG cosmological hydrodynamical simulation and SDSS-III (BOSS). We show that the primary effect of density-weighting is an increase of the alignment amplitude at large scales, whereas the small-scale impact is sample-dependent. We also assess the tidal alignment paradigm for IllustrisTNG galaxies using two-point correlation functions of galaxy shapes, tidal fields, and the sampled background tidal field of the simulation box. We find, given the precision of our measurements, that central galaxies align linearly to the underlying (non-linear) tidal field well into the 1-halo regime.
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BibTeX
@misc{rogozenski2026modelindependent,
title = {{Model-Independent Assessments of Tidal Alignment and Density-Weighting Dependence in Galaxy Intrinsic Alignments}},
author = {Paul Rogozenski and Sukhdeep Singh and Jonathan Blazek and Rachel Mandelbaum and Hung-Jin Huang and Ananth Tenneti},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.42151},
eprint = {2610.42151},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.42151},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Model-Independent Assessments of Tidal Alignment and Density-Weighting Dependence in Galaxy Intrinsic Alignments
AU - Paul Rogozenski
AU - Sukhdeep Singh
AU - Jonathan Blazek
AU - Rachel Mandelbaum
AU - Hung-Jin Huang
AU - Ananth Tenneti
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2610.42151
UR - https://arxiv.org/abs/2610.42151
AB - Intrinsic alignments (IA) of galaxies are an important source of systematic uncertainty in weak gravitational lensing measurements and also serve as a test for models of galaxy formation and evolution. These galaxy alignments are usually modeled assuming that the IA are sourced by the tidal fields around the galaxies. However, galaxy properties, like their proximity to other galaxies and their mass, provide alignment contributions beyond the tidal field. In this work, we perform novel model-agnostic tests to determine the impact of density-weighting on the IA of galaxies using data from the IllustrisTNG cosmological hydrodynamical simulation and SDSS-III (BOSS). We show that the primary effect of density-weighting is an increase of the alignment amplitude at large scales, whereas the small-scale impact is sample-dependent. We also assess the tidal alignment paradigm for IllustrisTNG galaxies using two-point correlation functions of galaxy shapes, tidal fields, and the sampled background tidal field of the simulation box. We find, given the precision of our measurements, that central galaxies align linearly to the underlying (non-linear) tidal field well into the 1-halo regime.
ER -