Power-law density spherical potential

class galpy.potential.PowerSphericalPotential(amp=1.0, alpha=1.0, normalize=False, r1=1.0, ro=None, vo=None)[source]

Class that implements spherical potentials that are derived from power-law density models

\[\rho(r) = \frac{\mathrm{amp}}{r_1^3}\,\left(\frac{r_1}{r}\right)^{\alpha}\]
__init__(amp=1.0, alpha=1.0, normalize=False, r1=1.0, ro=None, vo=None)[source]

NAME:

__init__

PURPOSE:

initialize a power-law-density potential

INPUT:

amp - amplitude to be applied to the potential (default: 1); can be a Quantity with units of mass or Gxmass

alpha - power-law exponent

r1= (1.) reference radius for amplitude (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:

2010-07-10 - Written - Bovy (NYU)