galpy.df.diskdf.sigma2surfacemass

diskdf.sigma2surfacemass(R, romberg=False, nsigma=None, relative=False)[source]

Calculate the product sigma_R^2 x surface-mass at R by marginalizing over velocity.

Parameters:

  • R (float or Quantity) – Radius at which to calculate the sigma_R^2 x surfacemass density.

  • romberg (bool, optional) – If True, use a romberg integrator (default: False).

  • nsigma (float, optional) – Number of sigma to integrate the velocities over.

  • relative (bool, optional) – If True, return the relative density (default: False).

Returns:

Sigma_R^2 x surface-mass at R.

Return type:

float

Notes

  • 2010-03-XX - Written - Bovy (NYU).