galpy.potential.dvcircdR

galpy.potential.dvcircdR(Pot, R, phi=None, t=0.0)[source]

Calculate the derivative of the circular velocity wrt R at R in potential Pot.

Parameters:
  • Pot (Potential or list of Potential instances) – Potential instance or list of such instances.

  • R (float or Quantity) – Galactocentric radius.

  • phi (float or Quantity, optional) – Azimuth to use for non-axisymmetric potentials.

  • t (float, optional) – Instantaneous time (default: 0)

Returns:

Derivative of the circular rotation velocity wrt R.

Return type:

float or Quantity

Notes

  • 2013-01-08 - Written - Bovy (IAS)

  • 2016-06-28 - Added phi= keyword for non-axisymmetric potential - Bovy (UofT)