galpy.df.diskdf.kurtosisvR¶
- diskdf.kurtosisvR(R, romberg=False, nsigma=None, phi=0.0)[source]¶
NAME:
kurtosisvR
PURPOSE:
calculate excess kurtosis in vR at R by marginalizing over velocity
INPUT:
R - radius at which to calculate <vR> (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:
kurtosisvR
HISTORY:
2011-12-07 - Written - Bovy (NYU)