Self-consistent gas and stellar dynamics of disk galaxies: A problem of dark mass

TL;DR

This paper uses numerical simulations to study the complex dynamics of disk galaxies, focusing on the formation of bars, lopsided structures, and double bars within stellar and gas disks influenced by dark matter halos.

Contribution

It introduces self-consistent models of galaxy dynamics including bar formation, lopsidedness, and double bars, highlighting the role of gravitational instability and dark matter.

Findings

Bars can form from gravitational instability in cold gas components.

Lopsided galaxies can arise from axisymmetric disks due to instability.

Double bar structures can be dynamically stable in galaxy models.

Abstract

We present results of numerical modeling made for the galactic stellar and stellar-gas disk embedded in the spherical halo and bulge. The stellar disk is simulated by N-body system, the equations of hydrodynamics are solved by TVD-method. We used TREEcode-algorithm for calculation of a self-gravity in stellar and gaseous components. The possibility of bars birth in a hot stellar disk because of gravitational instability of a cold gas component is investigated. The conditions of occurrence lopsided-galaxies from a axisymmetric disk as a result of gravitational instability are explored. The self-consistent models of double bars are constructed and the dynamical stability of these structures is discussed.