Disc instabilities and semi-analytic modelling of galaxy formation
E. Athanassoula
TL;DR
This paper critiques the traditional criterion for disc stability in galaxy formation models, highlighting its limitations, and proposes an alternative approach to improve semi-analytic simulations.
Contribution
It identifies shortcomings in the Efstathiou, Lake and Negroponte criterion and suggests a new, more accurate method for modeling disc stability in galaxy formation.
Findings
The classic stability criterion cannot reliably distinguish stable from unstable discs.
Current recipes for spheroid formation have notable shortcomings.
An alternative stability modeling approach is proposed.
Abstract
The Efstathiou, Lake and Negroponte (1982) criterion can not distinguish bar stable from bar unstable discs and thus should not be used in semi-analytic galaxy formation simulations. I discuss the reasons for this, illustrate it with examples and point out shortcomings in the recipes used for spheroid formation. I propose an alternative, although much less straightforward, possibility.
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