# Double exponential disk potential¶

class galpy.potential.DoubleExponentialDiskPotential(amp=1.0, hr=0.3333333333333333, hz=0.0625, normalize=False, ro=None, vo=None, de_h=0.001, de_n=10000)[source]

Class that implements the double exponential disk potential

$\rho(R,z) = \mathrm{amp}\,\exp\left(-R/h_R-|z|/h_z\right)$
__init__(amp=1.0, hr=0.3333333333333333, hz=0.0625, normalize=False, ro=None, vo=None, de_h=0.001, de_n=10000)[source]

NAME:

__init__

PURPOSE:

initialize a double-exponential disk potential

INPUT:

amp - amplitude to be applied to the potential (default: 1); can be a Quantity with units of mass density or Gxmass density

hr - disk scale-length (can be Quantity)

hz - scale-height (can be Quantity)

normalize - if True, normalize such that vc(1.,0.)=1., or, if given as a number, such that the force is this fraction of the force necessary to make vc(1.,0.)=1.

de_h= (1e-3) step used in numerical integration (use 1000 for a lower accuracy version that is typically still high accuracy enough, but faster)

de_b= (10000) number of points used in numerical integration

ro=, vo= distance and velocity scales for translation into internal units (default from configuration file)

OUTPUT:

DoubleExponentialDiskPotential object

HISTORY:

2010-04-16 - Written - Bovy (NYU)

2013-01-01 - Re-implemented using faster integration techniques - Bovy (IAS)

2020-12-24 - Re-implemented again using more accurate integration techniques for Bessel integrals - Bovy (UofT)