Ring potential¶
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class
galpy.potential.
RingPotential
(amp=1.0, a=0.75, normalize=False, ro=None, vo=None)[source]¶ Class that implements the potential of an infinitesimally-thin, circular ring
\[\rho(R,z) = \frac{\mathrm{amp}}{2\pi\,R_0}\,\delta(R-R_0)\,\delta(z)\]with \(\mathrm{amp} = GM\) the mass of the ring.
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__init__
(amp=1.0, a=0.75, normalize=False, ro=None, vo=None)[source]¶ NAME:
__init__PURPOSE:
initialize a circular ring potentialINPUT:
amp - mass of the ring (default: 1); can be a Quantity with units of mass or Gxmass
a= (0.75) radius of the ring (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.; note that because the force is always positive at r < a, this does not work if a > 1
ro=, vo= distance and velocity scales for translation into internal units (default from configuration file)
OUTPUT:
(none)HISTORY:
2018-08-04 - Written - Bovy (UofT)
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