galpy.df.impulse_deltav_general¶
- galpy.df.impulse_deltav_general(v, y, b, w, pot)[source]¶
NAME:
impulse_deltav_general
PURPOSE:
calculate the delta velocity to due an encounter with a general spherical potential in the impulse approximation; allows for arbitrary velocity vectors, but y is input as the position along the stream
INPUT:
v - velocity of the stream (nstar,3)
y - position along the stream (nstar)
b - impact parameter
w - velocity of the subhalo (3)
pot - Potential object or list thereof (should be spherical)
OUTPUT:
deltav (nstar,3)
HISTORY:
2015-05-04 - SANDERS
2015-06-15 - Tweak to use galpy’ potential objects - Bovy (IAS)