期刊
ASTROPHYSICAL JOURNAL
卷 602, 期 2, 页码 678-684出版社
UNIV CHICAGO PRESS
DOI: 10.1086/381052
关键词
galaxies : evolution; galaxies : kinematics and dynamics; galaxies : structure
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 colored 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 conclusions are 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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