Introducing a new 3D dynamical model for barred galaxies

Abstract

The regular or chaotic dynamics of an analytical realistic three dimensional model composed of a spherically symmetric central nucleus, a bar and a flat disk is investigated. For describing the properties of the bar we introduce a new simple dynamical model and we explore the influence on the character of orbits of all the involved parameters of it, such as the mass and the scale length of the bar, the major semi-axis and the angular velocity of the bar as well as the energy. Regions of phase space with ordered and chaotic motion are identified in dependence on these parameters and for breaking the rotational symmetry. First we study in detail the dynamics in the invariant plane $z=p_z=0$ using the Poincaré map as a basic tool and then we study the full 3 dimensional case using the SALI method as principal tool for distinguishing between order and chaos. We also present strong evidence obtained through the numerical simulations that our new bar model can realistically describe the formation and the evolution of the observed twin spiral structure in barred galaxies.

Published in Publications of the Astronomical Society of Australia (PASA) journal

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Cited by in corpus (10)

• Orbital and escape dynamics in barred galaxies - II. The 3D system: Exploring the role of the normally hyperbolic invariant manifolds
• Orbital and escape dynamics in barred galaxies - I. The 2D system
• Unraveling the escape dynamics and the nature of the normally hyperbolic invariant manifolds in tidally limited star clusters
• Role of galactic bars in the formation of spiral arms: A study through orbital and escape dynamics -- I
• Orbital and escape dynamics in barred galaxies - III. The 3D system: Correlations between the basins of escape and the NHIMs
• Orbital and escape dynamics in barred galaxies -- IV. Heteroclinic connections
• Non-equilibrium in the Solar Neighbourhood using dynamical modelling with Gaia DR2
• Distinguishing between order and chaos in a simple barred galaxy model
• Chaos Control with Ion Propulsion
• Orbits in elementary, power-law galaxy bars: 1. Occurence and role of single loops