Isochrone potential

class galpy.potential.IsochronePotential(amp=1.0, b=1.0, normalize=False, ro=None, vo=None)

Class that implements the Isochrone potential

\[\Phi(r) = -\frac{\mathrm{amp}}{b+\sqrt{b^2+r^2}}\]

with \(\mathrm{amp} = GM\) the total mass.

__init__(amp=1.0, b=1.0, normalize=False, ro=None, vo=None)

Initialize an isochrone potential.

Parameters:

• amp (float or Quantity, optional) – Amplitude to be applied to the potential, the total mass. Can be a Quantity with units of mass or Gxmass.

• b (float or Quantity, optional) – Scale radius of the isochrone potential.

• normalize (bool or float, optional) – If True, normalize such that vc(1.,0.)=1., or, if given as a number, such that the force is this fraction of the force necessary to make vc(1.,0.)=1. Default is False.

• ro (float or Quantity, optional) – Distance scale for translation into internal units (default from configuration file).

• vo (float or Quantity, optional) – Velocity scale for translation into internal units (default from configuration file).

Notes

• 2013-09-08 - Written - Bovy (IAS)