Disc instabilities and semi-analytic modelling of galaxy formation

Details Disc instabilities and semi-analytic modelling of galaxy formation Disc instabilities and semi-analytic modelling of galaxy formation

2008-07-31

arxiv.org/abs/0808.0016v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, accepted for publication in MNRAS Letters

Scientific paper

10.1111/j.1745-3933.2008.00541.x

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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