autogalaxy.profiles.mass.Chameleon#
- class Chameleon[source]#
Bases:
MassProfile
,StellarProfile
The elliptical Chamelon mass profile.
- Parameters:
centre (
Tuple
[float
,float
]) – The (y,x) arc-second coordinates of the profile centre.ell_comps (
Tuple
[float
,float
]) – The first and second ellipticity components of the elliptical coordinate system.intensity (
float
) – Overall intensity normalisation of the light profile (units are dimensionless and derived from the data the light profile’s image is compared too, which is expected to be electrons per second).core_radius_0 (the core size of the first elliptical cored Isothermal profile.)
core_radius_1 (core_radius_0 + core_radius_1 is the core size of the second elliptical cored Isothermal profile.) – We use core_radius_1 here is to avoid negative values.
form (Profile) – mass_to_light_ratio * intensity * (1.0 / Sqrt(x^2 + (y/q)^2 + core_radius_0^2) - 1.0 / Sqrt(x^2 + (y/q)^2 + (core_radius_0 + core_radius_1)**2.0))
Methods
angle_to_profile_grid_from
The angle between each angle theta on the grid and the profile, in radians.
area_within_curve_list_from
contour_list_from
convergence_1d_from
Calculate the projected convergence at a given set of arc-second gridded coordinates.
convergence_2d_via_hessian_from
Returns the convergence of the lensing object, which is computed from the 2D deflection angle map via the Hessian using the expression (see equation 56 https://inspirehep.net/literature/419263):
convergence_2d_via_jacobian_from
Returns the convergence of the lensing object, which is computed from the 2D deflection angle map via the Jacobian using the expression (see equation 58 https://inspirehep.net/literature/419263):
convergence_func
Calculate the deflection angles at a given set of arc-second gridded coordinates.
deflections_2d_via_potential_2d_from
deflections_yx_2d_from
density_between_circular_annuli
Calculate the mass between two circular annuli and compute the density by dividing by the annuli surface area.
eccentric_radii_grid_from
Convert a grid of (y,x) coordinates to an eccentric radius: :math: axis_ratio^0.5 (x^2 + (y^2/q))^0.5
einstein_mass_angular_from
Returns the Einstein radius corresponding to the area within the tangential critical curve.
einstein_mass_angular_list_from
Returns a list of the angular Einstein massses corresponding to the area within each tangential critical curve.
einstein_radius_from
Returns the Einstein radius corresponding to the area within the tangential critical curve.
einstein_radius_list_from
Returns a list of the Einstein radii corresponding to the area within each tangential critical curve.
elliptical_radii_grid_from
Convert a grid of (y,x) coordinates to their elliptical radii values: :math: (x^2 + (y^2/q))^0.5
extract_attribute
Returns an attribute of a class and its children profiles in the galaxy as a ValueIrregular or Grid2DIrregular object.
has
Does this instance have an attribute which is of type cls?
hessian_from
Returns the Hessian of the lensing object, where the Hessian is the second partial derivatives of the potential (see equation 55 https://inspirehep.net/literature/419263):
Calculate the intensity of the Chamelon light profile on a grid of radial coordinates.
jacobian_from
Returns the Jacobian of the lensing object, which is computed by taking the gradient of the 2D deflection angle map in four direction (positive y, negative y, positive x, negative x).
magnification_2d_from
Returns the 2D magnification map of lensing object, which is computed as the inverse of the determinant of the jacobian.
magnification_2d_via_hessian_from
Returns the 2D magnification map of lensing object, which is computed from the 2D deflection angle map via the Hessian using the expressions (see equation 60 https://inspirehep.net/literature/419263):
mass_angular_within_circle_from
Integrate the mass profiles's convergence profile to compute the total mass within a circle of specified radius.
mass_integral
potential_1d_from
potential_2d_from
potential_func
radial_caustic_list_from
Returns all radial caustics of the lensing system, which are computed as follows:
radial_critical_curve_area_list_from
Returns the surface area within each radial critical curve as a list, the calculation of which is described in the function radial_critical_curve_list_from().
radial_critical_curve_list_from
Returns all radial critical curves of the lensing system, which are computed as follows:
radial_eigen_value_from
Returns the radial eigen values of lensing jacobian, which are given by the expression:
radial_grid_from
Convert a grid of (y, x) coordinates, to their radial distances from the profile centre (e.g. :math: r = x**2 + y**2).
rotated_grid_from_reference_frame_from
Rotate a grid of (y,x) coordinates which have been transformed to the elliptical reference frame of a profile back to the original unrotated coordinate grid reference frame.
shear_yx_2d_via_hessian_from
Returns the 2D (y,x) shear vectors of the lensing object, which are computed from the 2D deflection angle map via the Hessian using the expressions (see equation 57 https://inspirehep.net/literature/419263):
shear_yx_2d_via_jacobian_from
Returns the 2D (y,x) shear vectors of the lensing object, which are computed from the 2D deflection angle map via the Jacobian using the expression (see equation 58 https://inspirehep.net/literature/419263):
tangential_caustic_list_from
Returns all tangential caustics of the lensing system, which are computed as follows:
tangential_critical_curve_area_list_from
Returns the surface area within each tangential critical curve as a list, the calculation of which is described in the function tangential_critical_curve_list_from().
tangential_critical_curve_list_from
Returns all tangential critical curves of the lensing system, which are computed as follows:
tangential_eigen_value_from
Returns the tangential eigen values of lensing jacobian, which are given by the expression:
transformed_from_reference_frame_grid_from
Transform a grid of (y,x) coordinates from the reference frame of the profile to the original observer reference frame.
transformed_to_reference_frame_grid_from
Transform a grid of (y,x) coordinates to the reference frame of the profile.
Attributes
angle
The position angle in degrees of the major-axis of the ellipse defined by profile, defined counter clockwise from the positive x-axis (0.0 > angle > 180.0).
angle_radians
The position angle in radians of the major-axis of the ellipse defined by profile, defined counter clockwise from the positive x-axis (0.0 > angle > 2pi).
average_convergence_of_1_radius
The radius a critical curve forms for this mass profile, e.g. where the mean convergence is equal to 1.0.
The ratio of the minor-axis to major-axis (b/a) of the ellipse defined by profile (0.0 > q > 1.0).
ellipticity_rescale
- deflections_2d_via_analytic_from(grid, **kwargs)[source]#
Calculate the deflection angles at a given set of arc-second gridded coordinates. Following Eq. (15) and (16), but the parameters are slightly different.
- Parameters:
grid (
Union
[ndarray
,Grid2D
,Grid2DIrregular
]) – The grid of (y,x) arc-second coordinates the deflection angles are computed on.
- convergence_2d_from(grid, **kwargs)[source]#
Calculate the projected convergence at a given set of arc-second gridded coordinates. :type grid:
Union
[ndarray
,Grid2D
,Grid2DIrregular
] :param grid: The grid of (y,x) arc-second coordinates the convergence is computed on.
- image_2d_via_radii_from(grid_radii)[source]#
Calculate the intensity of the Chamelon light profile on a grid of radial coordinates.
- Parameters:
grid_radii (
ndarray
) – The radial distance from the centre of the profile. for each coordinate on the grid.
- property axis_ratio#
The ratio of the minor-axis to major-axis (b/a) of the ellipse defined by profile (0.0 > q > 1.0).