galpy.df.diskdf.oortC¶
- diskdf.oortC(R, romberg=False, nsigma=None, phi=0.0)[source]¶
NAME:
oortC
PURPOSE:
calculate the Oort function C
INPUT:
R - radius at which to calculate C (can be Quantity)
OPTIONAL INPUT:
nsigma - number of sigma to integrate the velocities over
KEYWORDS:
romberg - if True, use a romberg integrator (default: False)
OUTPUT:
Oort C at R
HISTORY:
2011-04-19 - Written - Bovy (NYU)
BUGS:
could be made more efficient, e.g., surfacemass is calculated multiple times we know this is zero, but it is calculated anyway (bug or feature?)