FaucherSpiral

class gammapy.astro.population.FaucherSpiral[source]

Bases: gammapy.astro.population.LogSpiral

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

Reference: http://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 spiralarm. 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.
Returns:

Returns dx and dy, if blurring= true.