galpy.potential.planarPotential.phitorque

planarPotential.phitorque(R, phi=0.0, t=0.0)

Evaluate the azimuthal torque = - d Phi / d phi.

Parameters:

• R (float or Quantity) – Cylindrical radius.

• phi (float or Quantity, optional) – Azimuth (default 0.0).

• t (float or Quantity, optional) – Time (default 0.0).

Returns:

Azimuthal torque tau_phi(R, (phi, t)).

Return type:

float or Quantity

Notes

• 2010-07-13 - Written - Bovy (NYU)