Spherical Shell Potential¶
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class
galpy.potential.
SphericalShellPotential
(amp=1.0, a=0.75, normalize=False, ro=None, vo=None)[source]¶ Class that implements the potential of an infinitesimally-thin, spherical shell
\[\rho(r) = \frac{\mathrm{amp}}{4\pi\,a^2}\,\delta(r-a)\]with \(\mathrm{amp} = GM\) the mass of the shell.
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__init__
(amp=1.0, a=0.75, normalize=False, ro=None, vo=None)[source]¶ NAME:
__init__PURPOSE:
initialize a spherical shell potentialINPUT:
amp - mass of the shell (default: 1); can be a Quantity with units of mass or Gxmass
a= (0.75) radius of the shell (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 zero 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)
2020-03-30 - Re-implemented using SphericalPotential - Bovy (UofT)
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