1. Dynamics of rotating elliptical galaxies
Flavio De Lorenzi,
Victor Debattista, Ortwin Gerhard

2. Questions
What are the kinematics of a rotating triaxial elliptical galaxy?
Is there a tell-tale signature of figure rotation; or, is it possible to reproduce the projected velocity and dispersion maps with a non-rotating model?

3. The Made-to-Measure (M2M) Algorithm
Assign to each particle an individually adaptive weight
Adjust the weights to minimize the deviations from the observables
Syer & Tremaine, 1996

4. M2M Algorithm: Implementation
An observable of a particle model is computed by
The ´Force of change´
forces the system to match the target-observables
It also includes time-smoothing and maximum entropy

5. Working scheme ICs Pot.Solver Int.Parts no yes converged? M2M stop
targets

6. The models
Generate a spherical Hernquist particle model from DF
Deform to a triaxial distribution (M2M)
Spin up the triax model by evolving it in a corotating frame and retaining its shape using the M2M
Compute the final kinematic observables
Try to build a new non-rotating particle model with the same velocity and dispersion maps

7. Results: Mass Moments and Rotation

8. Results: Kinematic Maps
rotating model
non-rotating model
The extent of a single field in each axis is -2Reff to 2Reff

9. Conclusions The kinematics is well reproduce within for a
It appears difficult to distinguish between the kinematics of a non-rotating and (even) a rapidly rotating triaxial elliptical galaxy
Perhaps increasing the number of particles could affect the result.