lenstronomy minor release 1.5.1

[Simon Birrer]

Dear lenstronomy users,

this is a notice of a minor release on PyPi, lenstronomy version 1.5.1. This update should not impact your usage when updating from 1.5.0. The release is primarily intended to provide a clear stamp for a project and a bug fix in the Hessian of the POINT_MASS lens model (thanks for Giulia Pagano for pointing this out).

Nicolas Tessore has implemented the’EPL’, elliptical power-law lens model, which is effectively the ‘PEMD’ but does not require fastell4py nor fortran to be used (see Tessore et al. 2015 for details). I personally haven’t checked speed differences and detailed accuracy comparisons (the EPL and PEMD models are both tested in lenstronomy, but not against each other yet). There is a chance that the underlying calculation from fastell4py is going to be replaced by the new implementation, but this is not part of this minor release.

See below the minor release lenstronomy 1.5.1 notes.

Let me know if you have questions.

Best,

Simon

lenstronomy version 1.5.1 release notes

- LensModel module:

- addition of the ‘EPL’ model (from Tessore et al. 2015)

- bug fix in POINT_MASS hessian() function

- GalKin module:

- added multi-observation mode in the prediction of the stellar kinematics

Minor documentation improvements.