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)