Miyamoto-Nagai potential¶
- class galpy.potential.MiyamotoNagaiPotential(amp=1.0, a=1.0, b=0.1, normalize=False, ro=None, vo=None)[source]¶
Class that implements the Miyamoto-Nagai potential
\[\Phi(R,z) = -\frac{\mathrm{amp}}{\sqrt{R^2+(a+\sqrt{z^2+b^2})^2}}\]with \(\mathrm{amp} = GM\) the total mass.
- __init__(amp=1.0, a=1.0, b=0.1, normalize=False, ro=None, vo=None)[source]¶
NAME:
__init__
PURPOSE:
initialize a Miyamoto-Nagai potential
INPUT:
amp - amplitude to be applied to the potential, the total mass (default: 1); can be a Quantity with units of mass or Gxmass
a - scale length (can be Quantity)
b - scale height (can be Quantity)
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.
ro=, vo= distance and velocity scales for translation into internal units (default from configuration file)
OUTPUT:
(none)
HISTORY:
2010-07-09 - Started - Bovy (NYU)