Measuring bar pattern speeds from single simulation snapshots

Abstract

We describe methods to measure simultaneously the orientation angle $\psi$ and pattern speed $\Omega$ from single snapshots of simulated barred galaxies. Unlike previous attempts, our approach is unbiased, precise, and consistent in the sense that $\psi =\int \Omega \mathrm{d}t$. It can be extended to obtain the rate and axis of rotation, i.e. the vector $\mathbf{\Omega }$. We provide computer code implementing our method.

7 pages, accepted at MNRAS; v2: clarified discussion of previous work

References in corpus (3)

• A Near-Infrared Study of 2MASS Bars in Local Galaxies: An Anchor for High Redshift Studies
• The Dependence of Bar Frequency on Galaxy Mass, Colour, and Gas Content -- and Angular Resolution -- in the Local Universe
• Time-dependent Corotation Resonance in Barred Galaxies