galpy.potential.Potential.phitorque¶
- Potential.phitorque(R, z, phi=0.0, t=0.0)[source]¶
NAME:
phitorque
PURPOSE:
evaluate the azimuthal torque tau_phi = -d Phi / d phi (R,z,phi,t)
INPUT:
R - Cylindrical Galactocentric radius (can be Quantity)
z - vertical height (can be Quantity)
phi - azimuth (rad; can be Quantity)
t - time (optional; can be Quantity)
OUTPUT:
tau_phi (R,z,phi,t)
HISTORY:
2010-07-10 - Written - Bovy (NYU)