Artículos de revistas
Chaos and dynamical trends in barred galaxies: bridging the gap between N-body simulations and time-dependent analytical models
Fecha
2014Registro en:
Monthly Notices of the Royal Astronomical society, Oxford, v. 438, p. 2201- 2217
0035-8711
10.1093/mnras/stt2355
Autor
Manos, T
Machado, Rubens Eduardo Garcia
Institución
Resumen
Self-consistent N-body simulations are efficient tools to study galactic dynamics. However,
using them to study individual trajectories (or ensembles) in detail can be challenging. Such
orbital studies are important to shed light on global phase space properties, which are the
underlying cause of observed structures. The potentials needed to describe self-consistent
models are time dependent. Here, we aim to investigate dynamical properties (regular/chaotic
motion) of a non-autonomous galactic system, whose time-dependent potential adequately
mimics certain realistic trends arising from N-body barred galaxy simulations. We construct
a fully time-dependent analytical potential, modelling the gravitational potentials of disc, bar
and dark matter halo, whose time-dependent parameters are derived from a simulation. We
study the dynamical stability of its reduced time-independent 2-degrees of freedom model,
charting the different islands of stability associated with certain orbital morphologies and
detecting the chaotic and regular regions. In the full 3-degrees of freedom time-dependent case,
we show representative trajectories experiencing typical dynamical behaviours, i.e. interplay
between regular and chaotic motion for different epochs. Finally, we study its underlying
global dynamical transitions, estimating fractions of (un)stable motion of an ensemble of
initial conditions taken from the simulation. For such an ensemble, the fraction of regular
motion increases with time.
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