# galpy.df.jeans.sigmar¶

galpy.df.jeans.sigmar(Pot, r, dens=None, beta=0.0)[source]

NAME:

sigmar

PURPOSE:

Compute the radial velocity dispersion using the spherical Jeans equation

INPUT:

Pot - potential or list of potentials (evaluated at R=r/sqrt(2),z=r/sqrt(2), sphericity not checked)

r - Galactocentric radius (can be Quantity)

dens= (None) tracer density profile (function of r); if None, the density is assumed to be that corresponding to the potential

beta= (0.) anisotropy; can be a constant or a function of r

OUTPUT:

sigma_r(r)

HISTORY:

2018-07-05 - Written - Bovy (UofT)