lenstronomy.PointSource.Types package

Submodules

lenstronomy.PointSource.Types.base_ps module

class lenstronomy.PointSource.Types.base_ps.PSBase(lens_model=None, fixed_magnification=False, additional_image=False)[source]

Bases: object

base point source type class

image_amplitude(kwargs_ps, *args, **kwargs)[source]

amplitudes as observed on the sky

Parameters:
  • kwargs_ps – keyword argument of point source model
  • kwargs – keyword arguments of function call
Returns:

numpy array of amplitudes

image_position(kwargs_ps, **kwargs)[source]

on-sky position

Parameters:kwargs_ps – keyword argument of point source model
Returns:numpy array of x, y image positions
source_amplitude(kwargs_ps, **kwargs)[source]

intrinsic source amplitudes (without lensing magnification, but still apparent)

Parameters:
  • kwargs_ps – keyword argument of point source model
  • kwargs – keyword arguments of function call (which are not used for this object
Returns:

numpy array of amplitudes

source_position(kwargs_ps, **kwargs)[source]

original unlensed position

Parameters:kwargs_ps – keyword argument of point source model
Returns:numpy array of x, y source positions
update_lens_model(lens_model_class)[source]

update LensModel() and LensEquationSolver() instance

Parameters:lens_model_class – LensModel() class instance
Returns:internal lensModel class updated

lenstronomy.PointSource.Types.lensed_position module

class lenstronomy.PointSource.Types.lensed_position.LensedPositions(lens_model=None, fixed_magnification=False, additional_image=False)[source]

Bases: lenstronomy.PointSource.Types.base_ps.PSBase

class of a a lensed point source parameterized as the (multiple) observed image positions Name within the PointSource module: ‘LENSED_POSITION’ parameters: ra_image, dec_image, point_amp If fixed_magnification=True, than ‘source_amp’ is a parameter instead of ‘point_amp’

image_amplitude(kwargs_ps, kwargs_lens=None, x_pos=None, y_pos=None, magnification_limit=None, kwargs_lens_eqn_solver=None)[source]

image brightness amplitudes

Parameters:
  • kwargs_ps – keyword arguments of the point source model
  • kwargs_lens – keyword argument list of the lens model(s), only used when requiring the lens equation solver
  • x_pos – pre-computed image position (no lens equation solver applied)
  • y_pos – pre-computed image position (no lens equation solver applied)
  • magnification_limit – float >0 or None, if float is set and additional images are computed, only those images will be computed that exceed the lensing magnification (absolute value) limit
  • kwargs_lens_eqn_solver – keyword arguments specifying the numerical settings for the lens equation solver see LensEquationSolver() class for details
Returns:

array of image amplitudes

image_position(kwargs_ps, kwargs_lens=None, magnification_limit=None, kwargs_lens_eqn_solver=None)[source]

on-sky image positions

Parameters:
  • kwargs_ps – keyword arguments of the point source model
  • kwargs_lens – keyword argument list of the lens model(s), only used when requiring the lens equation solver
  • magnification_limit – float >0 or None, if float is set and additional images are computed, only those images will be computed that exceed the lensing magnification (absolute value) limit
  • kwargs_lens_eqn_solver – keyword arguments specifying the numerical settings for the lens equation solver see LensEquationSolver() class for details
Returns:

image positions in x, y as arrays

source_amplitude(kwargs_ps, kwargs_lens=None)[source]

intrinsic brightness amplitude of point source When brightnesses are defined in magnified on-sky positions, the intrinsic brightness is computed as the mean in the magnification corrected image position brightnesses.

Parameters:
  • kwargs_ps – keyword arguments of the point source model
  • kwargs_lens – keyword argument list of the lens model(s), used when brightness are defined in magnified on-sky positions
Returns:

brightness amplitude (as numpy array)

source_position(kwargs_ps, kwargs_lens=None)[source]

original source position (prior to lensing)

Parameters:
  • kwargs_ps – point source keyword arguments
  • kwargs_lens – lens model keyword argument list (required to ray-trace back in the source plane)
Returns:

x, y position (as numpy arrays)

lenstronomy.PointSource.Types.source_position module

class lenstronomy.PointSource.Types.source_position.SourcePositions(lens_model=None, fixed_magnification=False, additional_image=False)[source]

Bases: lenstronomy.PointSource.Types.base_ps.PSBase

class of a single point source defined in the original source coordinate position that is lensed. The lens equation is solved to compute the image positions for the specified source position.

Name within the PointSource module: ‘SOURCE_POSITION’ parameters: ra_source, dec_source, source_amp If fixed_magnification=True, than ‘source_amp’ is a parameter instead of ‘point_amp’

image_amplitude(kwargs_ps, kwargs_lens=None, x_pos=None, y_pos=None, magnification_limit=None, kwargs_lens_eqn_solver=None)[source]

image brightness amplitudes

Parameters:
  • kwargs_ps – keyword arguments of the point source model
  • kwargs_lens – keyword argument list of the lens model(s), only ignored when providing image positions directly
  • x_pos – pre-computed image position (no lens equation solver applied)
  • y_pos – pre-computed image position (no lens equation solver applied)
  • magnification_limit – float >0 or None, if float is set and additional images are computed, only those images will be computed that exceed the lensing magnification (absolute value) limit
  • kwargs_lens_eqn_solver – keyword arguments specifying the numerical settings for the lens equation solver see LensEquationSolver() class for details
Returns:

array of image amplitudes

image_position(kwargs_ps, kwargs_lens=None, magnification_limit=None, kwargs_lens_eqn_solver=None)[source]

on-sky image positions

Parameters:
  • kwargs_ps – keyword arguments of the point source model
  • kwargs_lens – keyword argument list of the lens model(s), only used when requiring the lens equation solver
  • magnification_limit – float >0 or None, if float is set and additional images are computed, only those images will be computed that exceed the lensing magnification (absolute value) limit
  • kwargs_lens_eqn_solver – keyword arguments specifying the numerical settings for the lens equation solver see LensEquationSolver() class for details
Returns:

image positions in x, y as arrays

source_amplitude(kwargs_ps, kwargs_lens=None)[source]

intrinsic brightness amplitude of point source When brightnesses are defined in magnified on-sky positions, the intrinsic brightness is computed as the mean in the magnification corrected image position brightnesses.

Parameters:
  • kwargs_ps – keyword arguments of the point source model
  • kwargs_lens – keyword argument list of the lens model(s), used when brightness are defined in magnified on-sky positions
Returns:

brightness amplitude (as numpy array)

source_position(kwargs_ps, **kwargs)[source]

original source position (prior to lensing)

Parameters:kwargs_ps – point source keyword arguments
Returns:x, y position (as numpy arrays)

lenstronomy.PointSource.Types.unlensed module

class lenstronomy.PointSource.Types.unlensed.Unlensed(lens_model=None, fixed_magnification=False, additional_image=False)[source]

Bases: lenstronomy.PointSource.Types.base_ps.PSBase

class of a single point source in the image plane, aka star Name within the PointSource module: ‘UNLENSED’ This model can deal with arrays of point sources. parameters: ra_image, dec_image, point_amp

image_amplitude(kwargs_ps, **kwargs)[source]

amplitudes as observed on the sky

Parameters:
  • kwargs_ps – keyword argument of point source model
  • kwargs – keyword arguments of function call (which are not used for this object
Returns:

numpy array of amplitudes

image_position(kwargs_ps, **kwargs)[source]

on-sky position

Parameters:kwargs_ps – keyword argument of point source model
Returns:numpy array of x, y image positions
source_amplitude(kwargs_ps, **kwargs)[source]

intrinsic source amplitudes

Parameters:
  • kwargs_ps – keyword argument of point source model
  • kwargs – keyword arguments of function call (which are not used for this object
Returns:

numpy array of amplitudes

source_position(kwargs_ps, **kwargs)[source]

original physical position (identical for this object)

Parameters:kwargs_ps – keyword argument of point source model
Returns:numpy array of x, y source positions

Module contents