Logarithmic halo potential

class galpy.potential.LogarithmicHaloPotential(amp=1.0, core=1e-08, q=1.0, normalize=False)

Class that implements the logarithmic halo potential

\[\Phi(R,z) = \frac{\mathrm{amp}}{2}\,\ln\left(R^2+(z/q)^2+\mathrm{core}^2\right)\]

__init__(amp=1.0, core=1e-08, q=1.0, normalize=False)

NAME:

__init__

PURPOSE:

initialize a Logarithmic Halo potential

INPUT:

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

core - core radius at which the logarithm is cut

q - potential flattening (z/q)**2.

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:

2010-04-02 - Started - Bovy (NYU)