Source code for lenstronomy.LightModel.Profiles.ellipsoid
__author__ = 'sibirrer'
#this file contains a class to make a moffat profile
import numpy as np
from lenstronomy.Util import param_util
__all__ = ['Ellipsoid']
[docs]class Ellipsoid(object):
"""
class for an universal surface brightness within an ellipsoid
"""
def __init__(self):
self.param_names = ['amp', 'radius', 'e1', 'e2', 'center_x', 'center_y']
self.lower_limit_default = {'amp': 0, 'radius': 0, 'e1': -0.5, 'e2': -0.5, 'center_x': -100, 'center_y': -100}
self.upper_limit_default = {'amp': 1000, 'radius': 100, 'e1': 0.5, 'e2': 0.5, 'center_x': 100, 'center_y': 100}
[docs] def function(self, x, y, amp, radius, e1, e2, center_x, center_y):
"""
:param x:
:param y:
:param amp: surface brightness within the ellipsoid
:param radius: radius (product average of semi-major and semi-minor axis) of the ellipsoid
:param e1: eccentricity
:param e2: eccentricity
:param center_x: center
:param center_y: center
:return: surface brightness
"""
x_, y_ = param_util.transform_e1e2_product_average(x, y, e1, e2, center_x, center_y)
r2 = x_**2 + y_**2
flux = np.zeros_like(x)
flux[r2 <= radius**2] = 1
A = np.pi * radius ** 2
return amp / A * flux
def function(x, y, amp, sigma, center_x, center_y):
"""
returns torus (ellipse with constant surface brightness) profile
"""
x_shift = x - center_x
y_shift = y - center_y
A = np.pi * sigma**2
dist = (x_shift / sigma) ** 2 + (y_shift / sigma) ** 2
torus = np.zeros_like(x)
torus[dist <= 1] = 1
return amp/A * torus