popsynth.distributions.spiral_galaxy_distribution module

class popsynth.distributions.spiral_galaxy_distribution.SpiralGalaxyDistribution(seed: int = 1234, name: str = 'spiral_galaxy', form: Optional[str] = None)

Bases: SphericalDistribution

rho

a

b

R1

R0

__init__(seed: int = 1234, name: str = 'spiral_galaxy', form: Optional[str] = None)

A spiral galaxy spatial distribution.

Parameters

• seed (int) – Random seed

• name (str) – Name of the distribution

• form (str) – Mathematical description of distribution

• rho (DistributionParameter) – Local density

• a (DistributionParameter) – Shape parameter

• b (DistributionParameter) – Shape parameter

• R1 (DistributionParameter) – Scale parameter

• R0 (DistributionParameter) – Scale parameter

dNdV(r)

The differential number of objects per volume element

Parameters

distance –

Returns

draw_sky_positions(size)

Based on Wainscoat 1992 and Faucher-Giguere 2007.

Code thanks to Mortiz Pleintinger.