autogalaxy.profiles.mass.SersicSph#

class SersicSph[source]#

Bases: Sersic

The Sersic mass profile, the mass profiles of the light profiles that are used to fit and subtract the lens model_galaxy’s light.

Parameters:

centre (Tuple[float, float]) – The (y,x) arc-second coordinates of the profile centre
intensity (float) – Overall flux intensity normalisation in the light profiles (electrons per second)
effective_radius (float) – The circular radius containing half the light of this profile.
sersic_index (float) – Controls the concentration of the profile (lower -> less concentrated, higher -> more concentrated).
mass_to_light_ratio (float) – The mass-to-light ratio of the light profile.

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`
`convergence_2d_from`	Calculate the projected convergence at a given set of arc-second gridded coordinates.
`convergence_2d_via_cse_from`	Calculate the projected 2D convergence from a grid of (y,x) arc second coordinates, by computing and summing the convergence of each individual cse used to decompose the mass profile.
`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_2d_via_mge_from`	Calculate the projected convergence at a given set of arc-second gridded coordinates.
`convergence_cse_1d_from`	One dimensional function which is solved to decompose a convergence profile in cored steep ellipsoids, given by equation (14) of Oguri 2021 (https://arxiv.org/abs/2106.11464).
`convergence_func`
`convergence_func_gaussian`
`decompose_convergence_via_cse`	Decompose the convergence of the Sersic profile into cored steep elliptical (cse) profiles.
`decompose_convergence_via_mge`
`deflection_func`
`deflections_2d_via_cse_from`	Calculate the projected 2D deflection angles from a grid of (y,x) arc second coordinates, by computing and summing the convergence of each individual cse used to decompose the mass profile.
`deflections_2d_via_integral_from`	Calculate the deflection angles at a given set of arc-second gridded coordinates.
`deflections_2d_via_mge_from`	Calculate the projected 2D deflection angles from a grid of (y,x) arc second coordinates, by computing and summing the convergence of each individual cse used to decompose the mass profile.
`deflections_2d_via_potential_2d_from`
`deflections_via_cse_from`	Returns the deflection angles of a 1d cored steep ellisoid (CSE) profile, given by equation (19) and (20) of Oguri 2021 (https://arxiv.org/abs/2106.11464).
`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
`eta`	see Eq.(6) of 1906.00263
`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):
`image_2d_via_radii_from`	Returns the intensity of the profile at a given radius.
`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).
`kesi`	see Eq.(6) of 1906.08263
`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 = x2 + y2).
`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.
`zeta_from`	The key part to compute the deflection angle of each Gaussian.

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.
`axis_ratio`	The ratio of the minor-axis to major-axis (b/a) of the ellipse defined by profile (0.0 > q > 1.0).
`elliptical_effective_radius`	The effective_radius of a Sersic light profile is defined as the circular effective radius.
`ellipticity_rescale`
`sersic_constant`	A parameter derived from Sersic index which ensures that effective radius contains 50% of the profile's total integrated light.