Galactic Bars in Cosmological Context

TL;DR

This paper discusses the formation and evolution of galactic bars within the cosmological framework, emphasizing their origins from asymmetric dark matter halos and interactions with cosmic filaments.

Contribution

It introduces the concept of gas-rich bars forming in asymmetric dark matter halos and explores how hierarchical structure formation influences bar properties.

Findings

Bars form in asymmetric dark matter halos.

Interactions with cosmic filaments trigger multiple bar generations.

Bar properties align with hierarchical universe models.

Abstract

Galactic disks can form in asymmetric potentials of the assembling dark matter (DM) halos, giving rise to the first generation of gas-rich bars. Properties of these bars differ from canonical bars analyzed so far. Moreover, rapid disk growth is associated with the influx of clumpy DM and baryons along the large-scale filaments. Subsequent interactions between this substructure and the disk can trigger generations of bars, which can explain their ubiquity in the Universe. I provide a brief summary of such bar properties and argue that they fit naturally within the broad cosmological context of a hierarchical buildup of structure in the universe.