Systematic variation of MAF (top panel; for definition see Sect. 2.3.1) and the pitch angle γ (bottom panel) of the resulting swing amplification in the gas disk for a two-fluid (stars and gas) system where stellar disk has a finite thickness and the gas disk being infinitesimally-thin, plotted as a function of stellar disk finite thickness (βs). Here, Qs = 1.5, Qg = 1.2, ϵ = 0.1, η = 1, X = 1. Although modelled as infinitesimally-thin, the MAF of the swing-amplified features in the gas disk decreases steadily with the increase of finite thickness (equivalently an increase in βs ) of the other component due to the gravitational coupling between the two fluid components, for details see text.
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