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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Chaos and dynamical trends in barred galaxies: bridging the gap between N-body simulations and time-dependent analytical models

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Author(s):
Manos, T. [1, 2] ; Machado, Rubens E. G. [3]
Total Authors: 2
Affiliation:
[1] Univ Maribor, CAMTP, SI-2000 Maribor - Slovenia
[2] Univ Nova Gorica, Sch Appl Sci, SI-5270 Ajdovscina - Slovenia
[3] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 438, n. 3, p. 2201-2217, MAR 2014.
Web of Science Citations: 18
Abstract

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. (AU)

FAPESP's process: 09/54006-4 - A computer cluster for the Astronomy Department of the University of São Paulo Institute of Astronomy, Geophysics and Atmospheric Sciences and for the Cruzeiro do Sul University Astrophysics Center
Grantee:Elisabete Maria de Gouveia Dal Pino
Support type: Multi-user Equipment Program
FAPESP's process: 13/11219-3 - Chaos in galaxies: bridging the time-dependent analytical models and N-body simulations
Grantee:Rubens Eduardo Garcia Machado
Support type: Research Grants - Visiting Researcher Grant - International
FAPESP's process: 10/12277-9 - Numerical simulations of galaxy cluster mergers
Grantee:Rubens Eduardo Garcia Machado
Support type: Scholarships in Brazil - Post-Doctorate