FaucherSpiral#

class gammapy.astro.population.FaucherSpiral[source]#

Bases: LogSpiral

Milky way spiral arm used in Faucher et al (2006).

Reference: https://ui.adsabs.harvard.edu/abs/2006ApJ…643..332F

Attributes Summary

k

r_0

spiralarms

theta_0

Methods Summary

__call__(radius[, blur, random_state])

Draw random position from spiral arm distribution.

Attributes Documentation

k = <Quantity [4.25, 4.25, 4.89, 4.89] rad>#
r_0 = <Quantity [3.48, 3.48, 4.9 , 4.9 ] kpc>#
spiralarms = array(['Norma', 'Carina Sagittarius', 'Perseus', 'Crux Scutum'],       dtype='<U18')#
theta_0 = <Quantity [1.57, 4.71, 4.09, 0.95] rad>#

Methods Documentation

__call__(radius, blur=True, random_state='random-seed')[source]#

Draw random position from spiral arm distribution.

Returns the corresponding angle theta[rad] to a given radius[kpc] and number of spiral arm. Possible numbers are:

  • Norma = 0,

  • Carina Sagittarius = 1,

  • Perseus = 2

  • Crux Scutum = 3.

Parameters:
random_state{int, ‘random-seed’, ‘global-rng’, RandomState}

Defines random number generator initialisation. Passed to get_random_state. Default is ‘random-seed’.

Returns:
Returns dx and dy, if blurring= true.
__init__(*args, **kwargs)#
classmethod __new__(*args, **kwargs)#