Secular Evolution in Barred Galaxies

Details Secular Evolution in Barred Galaxies Secular Evolution in Barred Galaxies

1996-02-06

arxiv.org/abs/astro-ph/9602030v1

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of Nobel Symposium 98 "Barred Galaxies and Circumnuclear Activity", edited by Aa. Sandquist, P.O.

Scientific paper

A strong bar rotating within a massive halo should lose angular momentum to the halo through dynamical friction, as predicted by Weinberg. We have conducted fully self-consistent, numerical simulations of barred galaxy models with a live halo population and find that bars are indeed braked very rapidly. Specifically, we find that the bar slows sufficiently within a few rotation periods that the distance from the centre to co-rotation is more than twice the semi-major axis of the bar. Observational evidence (meagre) for bar pattern speeds seems to suggest that this ratio typically lies between 1.2 to 1.5 in real galaxies. We consider, a number of possible explanations for this discrepancy between theoretical prediction and observation, and conclude that no conventional alternative seems able to account for it.

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