popsynth.distributions.spiral_galaxy_distribution module

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

Bases: popsynth.distributions.spherical_distribution.SphericalDistribution

R0

R1

__init__(seed: int = 1234, name: str = 'spiral_galaxy', form: 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

a

b

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.

rho