galpy.df.impulse_deltav_general¶
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galpy.df.
impulse_deltav_general
(v, y, b, w, pot)[source]¶ NAME:
impulse_deltav_generalPURPOSE:
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 streamINPUT:
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)