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Strong lens modeling package.

Project description

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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 measuring the expansion rate of the universe and Birrer et al 2017 for quantifying lensing substructure to infer dark matter properties.

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 --user

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)

Additional python libraries:

  • CosmoHammer (through PyPi)

  • astropy

  • standard python libraries (numpy, scipy)

Modelling Features

  • a variety of lens models to use in arbitrary superposition

  • lens equation solver

  • multi-plane ray-tracing

  • Extended source reconstruction with basis sets (shapelets) and analytic light profiles

  • Point sources

  • numerical options for sub-grid ray-tracing and sub-pixel convolution

  • non-linear line-of-sight description

  • iterative point spread function reconstruction

  • linear and non-linear optimization modules

  • Pre-defined plotting and illustration routines

  • Particle swarm optimization for parameter fitting

  • MCMC (emcee from CosmoHammer) for parameter inferences

  • Kinematic modelling

  • Cosmographic inference tools

Getting started

The starting guide jupyter notebook leads through the main modules and design features of lenstronomy. The modular design of lenstronomy allows the user to directly access a lot of tools and each module can also be used as stand-alone packages.

Example notebooks

We have made an extension module available at http://github.com/sibirrer/lenstronomy_extensions. You can find simple examle notebooks for various cases.

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