motion_since_birth

gammapy.utils.coordinates.motion_since_birth(v, age, theta, phi)

Compute motion of an astrophysical object with a given velocity, direction and age.

Parameters

vQuantity

Absolute value of the velocity.

ageQuantity

Age of the source.

theta, phiQuantity

Angular direction of the velocity.

Returns

dx, dy, dzQuantity

Displacement in x, y, z direction.

vx, vy, vzQuantity

Velocity in x, y, z direction.