http://arxiv.org/abs/2211.00674
We describe methods to measure simultaneously the orientation angle $\psi$ and pattern speed $\Omega=\mathrm{d}\psi/\mathrm{d}t$ from single snapshots of simulated barred galaxies. Unlike previous attempts, which suffer from systematic errors of 5-25%, our approach is unbiased. It can be extended to obtain the rate and axis of rotation, i.e. the vector $\boldsymbol{\Omega}$. We provide computer code implementing our method.
W. Dehnen, M. Semczuk and R. Schoenrich
Thu, 3 Nov 22
29/59
Comments: 7 pages, accepted at MNRAS