Impact of Baryonic Physics on Intrinsic Alignments

Abstract

We explore the effects of specific assumptions in the subgrid models of star formation and stellar and AGN feedback on intrinsic alignments of galaxies in cosmological simulations of "MassiveBlack-II" family. Using smaller volume simulations, we explored the parameter space of the subgrid star formation and feedback model and found remarkable robustness of the observable statistical measures to the details of subgrid physics. The one observational probe most sensitive to modeling details is the distribution of misalignment angles. We hypothesize that the amount of angular momentum carried away by the galactic wind is the primary physical quantity that controls the orientation of the stellar distribution. Our results are also consistent with a similar study by the EAGLE simulation team.

7 pages, 6 figures, submitted to ApJ

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• Galaxy shape statistics in the effective field theory
• Group-scale intrinsic galaxy alignments in the Illustris-TNG and MassiveBlack-II simulations
• Merger Effects on the Spin and Shape Alignments of Galaxy Stellar, Cold and Hot Gas, and Dark Matter Components
• Galaxy-group (halo) alignments from SDSS DR7 and the ELUCID simulation
• A rising tide: Intrinsic alignments since the turn of the millennium
• Map-level baryonification: unified treatment of weak lensing two-point and higher-order statistics
• How the Galaxy Stellar Spins Acquire a Peculiar Tidal Connection?
• Galaxy Spin Alignment with Tidal Fields in the SDSS-IV MaNGA Survey
• Intrinsic alignments of galaxies in multiple projections