Noise-Enhanced Parametric Resonance in Perturbed Galaxies

Details Noise-Enhanced Parametric Resonance in Perturbed Galaxies Noise-Enhanced Parametric Resonance in Perturbed Galaxies

2003-08-27

arxiv.org/abs/astro-ph/0308481v1

Astrophys.J.602:678-684,2004

Astronomy and Astrophysics

Astrophysics

9 pages, inclduing 8 figures

Scientific paper

10.1086/381052

This paper describes how parametric resonances associated with a galactic potential subjected to relatively low amplitude, strictly periodic time-dependent perturbations can be impacted by pseudo-random variations in the pulsation frequency, modeled as coloured noise. One aim thereby is to allow for the effects of a changing oscillation frequency as the density distribution associated with a galaxy evolves during violent relaxation. Another is to mimic the possible effects of internal substructures, satellite galaxies, and or a high density environment. The principal conclusion is that allowing for a variable frequency does not vitiate the effects of parametric resonance; and that, in at least some cases, such variations can increase the overall importance of parametric resonance associated with systematic pulsations.

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