galpy.potential.Potential.rtide¶
-
Potential.
rtide
(R, z, phi=0.0, t=0.0, M=None)[source]¶ NAME:
rtidePURPOSE:
Calculate the tidal radius for object of mass M assuming a circular orbit as
\[r_t^3 = \frac{GM_s}{\Omega^2-\mathrm{d}^2\Phi/\mathrm{d}r^2}\]where \(M_s\) is the cluster mass, \(\Omega\) is the circular frequency, and \(\Phi\) is the gravitational potential. For non-spherical potentials, we evaluate \(\Omega^2 = (1/r)(\mathrm{d}\Phi/\mathrm{d}r)\) and evaluate the derivatives at the given position of the cluster.
INPUT:
R - Galactocentric radius (can be Quantity)
z - height (can be Quantity)
phi - azimuth (optional; can be Quantity)
t - time (optional; can be Quantity)
M - (default = None) Mass of object (can be Quantity)
OUTPUT:
Tidal RadiusHISTORY:
2018-03-21 - Written - Webb (UofT)