Strong lens modeling package.
Project description
A multi-purpose package to model strong gravitational lenses. The software is based on Birrer et al 2015 and finds application in e.g. Birrer et al. 2016 for time-delay cosmography and Birrer et al. 2017 for lensing substructure analysis.
The development is coordinated on GitHub and contributions are welcome. The documentation of lenstronomy is available at readthedocs.org and the package is distributed over PyPI.
Installation
$ pip install lenstronomy
Requirements
To run lens models with elliptical mass distributions, the fastell4py package, originally from Barkana (fastell), is also required and can be cloned from: https://github.com/sibirrer/fastell4py (needs a fortran compiler) * CosmoHammer (through PyPi) * standard python libraries (numpy, scipy)
Bug reporting and contributions
see CONTRIBUTING.rst
Modelling Features
Extended source reconstruction with basis sets (shapelets)
Analytic light profiles for lens and source as options
Point sources (including solving the lens equation)
a variety of mass models to use
non-linear line-of-sight description
iterative point spread function reconstruction
linear and non-linear optimization modules
Analysis tools
Standardized fitting procedures for lens modelling
Modular build up to design plugins by users
Pre-defined plotting and illustration routines
Particle swarm optimization for parameter fitting
MCMC (emcee from CosmoHammer) for parameter inferences
Kinematic modelling
Cosmographic inference tools
Example notebooks
We have made an extension module available at http://github.com/sibirrer/lenstronomy_extensions . You can find examle notebooks for various cases, such as time-delay cosmography, substructure lensing, line-of-sight analysis and source reconstructions.
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