Miyamoto-Nagai potential

class galpy.potential.MiyamotoNagaiPotential(amp=1.0, a=1.0, b=0.1, normalize=False)

Class that implements the Miyamoto-Nagai potential

\[\Phi(R,z) = -\frac{\mathrm{amp}}{\sqrt{R^2+(a+\sqrt{z^2+b^2})^2}}\]

__init__(amp=1.0, a=1.0, b=0.1, normalize=False)

NAME:

__init__

PURPOSE:

initialize a Miyamoto-Nagai potential

INPUT:

amp - amplitude to be applied to the potential (default: 1)

a - “disk scale” (in terms of Ro)

b - “disk height” (in terms of Ro)

normalize - 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.

OUTPUT:

(none)

HISTORY:

2010-07-09 - Started - Bovy (NYU)