A new multi-component stability parameter Q_delta = 5/3 maps disc swing amplification more consistently than older Q definitions and requires gas Q to be rescaled close to Q^(5/3).
https://ui.adsabs.harvard.edu/abs/1988A&A...195..105B 195
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Redefining $Q$ for multi-component discs of stars and gas
A new multi-component stability parameter Q_delta = 5/3 maps disc swing amplification more consistently than older Q definitions and requires gas Q to be rescaled close to Q^(5/3).