galpy.df.diskdf.sigma2¶
-
diskdf.
sigma2
(R, romberg=False, nsigma=None, phi=0.0)[source]¶ NAME:
sigma2PURPOSE:
calculate sigma_R^2 at R by marginalizing over velocityINPUT:
R - radius at which to calculate sigma_R^2 density (can be Quantity)OPTIONAL INPUT:
nsigma - number of sigma to integrate the velocities overKEYWORDS:
romberg - if True, use a romberg integrator (default: False)OUTPUT:
sigma_R^2 at RHISTORY:
2010-03-XX - Written - Bovy (NYU)