# galpy.df.jeans.sigmalos¶

galpy.df.jeans.sigmalos(Pot, R, dens=None, surfdens=None, beta=0.0, sigma_r=None)[source]

NAME:

sigmalos

PURPOSE:

Compute the line-of-sight 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 projected 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

surfdens= (None) tracer surface density profile (value at R or function of R); if None, the surface density is assumed to be that corresponding to the density

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

sigma_r= (None) if given, the solution of the spherical Jeans equation sigma_r(r) (used instead of solving the Jeans equation as part of this routine)

OUTPUT:

sigma_los(R)

HISTORY:

2018-08-27 - Written - Bovy (UofT)