galpy.potential.zvc¶
- galpy.potential.zvc(Pot, R, E, Lz, phi=0.0, t=0.0)[source]¶
NAME:
zvc
PURPOSE:
Calculate the zero-velocity curve: z such that Phi(R,z) + Lz/[2R^2] = E (assumes that F_z(R,z) = negative at positive z such that there is a single solution)
INPUT:
Pot - Potential instance or list of such instances
R - Galactocentric radius (can be Quantity)
E - Energy (can be Quantity)
Lz - Angular momentum (can be Quantity)
phi - azimuth (optional; can be Quantity)
t - time (optional; can be Quantity)
OUTPUT:
z such that Phi(R,z) + Lz/[2R^2] = E
HISTORY:
2020-08-20 - Written - Bovy (UofT)