galpy.df.impulse_deltav_hernquist_curvedstream¶
- galpy.df.impulse_deltav_hernquist_curvedstream(v, x, b, w, x0, v0, GM, rs)[source]¶
NAME:
impulse_deltav_plummer_hernquist
PURPOSE:
calculate the delta velocity to due an encounter with a Hernquist sphere in the impulse approximation; allows for arbitrary velocity vectors, and arbitrary position along the stream
INPUT:
v - velocity of the stream (nstar,3)
x - position along the stream (nstar,3)
b - impact parameter
w - velocity of the Hernquist sphere (3)
x0 - point of closest approach
v0 - velocity of point of closest approach
GM - mass of the Hernquist sphere (in natural units)
rs - size of the Hernquist sphere
OUTPUT:
deltav (nstar,3)
HISTORY:
2015-08-13 - SANDERS, using Wyn Evans calculation