galpy.potential.LinShuReductionFactor¶
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galpy.potential.
LinShuReductionFactor
(axiPot, R, sigmar, nonaxiPot=None, k=None, m=None, OmegaP=None)¶ NAME:
LinShuReductionFactorPURPOSE:
Calculate the Lin & Shu (1966) reduction factor: the reduced linear response of a kinematically-warm stellar disk to a perturbationINPUT:
axiPot - The background, axisymmetric potential
R - Cylindrical radius (can be Quantity)
sigmar - radial velocity dispersion of the population (can be Quantity)
Then either provide:
m= m in the perturbation’s m x phi (number of arms for a spiral)
k= wavenumber (see Binney & Tremaine 2008)
OmegaP= pattern speed (can be Quantity)
nonaxiPot= a non-axisymmetric Potential instance (such as SteadyLogSpiralPotential) that has functions that return OmegaP, m, and wavenumber
OUTPUT:
reduction factorHISTORY:
2014-08-23 - Written - Bovy (IAS)