Arbitrary Osipkov-Merritt DF

class galpy.df.osipkovmerrittdf(pot=None, denspot=None, ra=1.4, rmax=10000.0, scale=None, ro=None, vo=None)[source]

Class that implements spherical DFs with Osipkov-Merritt-type orbital anisotropy

\[\beta(r) = \frac{1}{1+r_a^2/r^2}\]

with \(r_a\) the anistropy radius for arbitrary combinations of potential and density profile.

__init__(pot=None, denspot=None, ra=1.4, rmax=10000.0, scale=None, ro=None, vo=None)[source]

NAME:

__init__

PURPOSE:

Initialize a DF with Osipkov-Merritt anisotropy

INPUT:

pot= (None) Potential instance or list thereof

denspot= (None) Potential instance or list thereof that represent the density of the tracers (assumed to be spherical; if None, set equal to pot)

ra - anisotropy radius (can be a Quantity)

rmax= (1e4) maximum radius to consider (can be Quantity); DF is cut off at E = Phi(rmax)

scale - Characteristic scale radius to aid sampling calculations. Optionaland will also be overridden by value from pot if available.

ro=, vo= galpy unit parameters

OUTPUT:

None

HISTORY:

2021-02-07 - Written - Bovy (UofT)