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Disc instabilities and semi-analytic modelling of galaxy formation


  • E. Athanassoula

    Corresponding author
    1. Laboratoire d'Astrophysique de Marseille, Observatoire Astronomique de Marseille Provence, Technopole de l'Etoile – Site de Chateau-Gombert, 38 rue Frédéric Joliot-Curie, 13388 Marseille Cédex 13, France
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The Efstathiou, Lake and Negroponte (1982) criterion cannot 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.