Dynamics of galactic disks in the nonaxisymmetric dark halo

TL;DR

This paper uses high-resolution numerical simulations to study how nonaxisymmetric dark halos influence the formation and evolution of spiral structures in galactic disks, revealing long-lived, global two-armed spirals with quasiperiodic rotation.

Contribution

It provides detailed analysis of spiral structure formation in galactic disks embedded in triaxial dark halos using advanced hydrodynamical and N-body simulations, highlighting the impact of halo shape on disk morphology.

Findings

Long-lived two-armed spiral structures form across various parameters.

Spiral structures are global with 2-3 turns depending on model parameters.

Spiral pattern rotates slowly with quasiperiodic angular velocity.

Abstract

The results of numerical simulations of the dynamics of galactic disks, which are submerged into nonaxisymmetric dark massive halo are discussed. Galaxy disks dynamics in the nonaxisymmetric (triaxial) dark halo were investigated in detail by the high resolution numerical hydrodynamical methods (TVD \& SPH) and N-body models. The long-lived two arms spiral structure generates for a wide range of parameters. The spiral structure is global and number of turns can be 2-3 in depends of model parameters. Morphology and kinematics of spiral structures were investigated in depends of the halo and the disk parameters. The spiral structure rotates slowly and the angular velocity varies is quasiperiodic.