Comparison of Strong Gravitational Lens Model Software II. HydraLens: Computer-Assisted Strong Gravitational Lens Model Generation and Translation

Abstract: The behavior of strong gravitational lens model software in the analysis of lens models is not necessarily consistent among the various software available, suggesting that the use of several models may enhance the understanding of the system being studied. Among the publicly available codes, the model input files are heterogeneous, making the creation of multiple models tedious. An enhanced method of creating model files and a method to easily create multiple models, may increase the number of comparison studies. HydraLens simplifies the creation of model files for four strong gravitational lens model software packages, including Lenstool, Gravlens/Lensmodel, glafic and PixeLens, using a custom designed GUI for each of the four codes that simplifies the entry of the model for each of these codes, obviating the need for user manuals to set the values of the many flags and in each data field. HydraLens is designed in a modular fashion, which simplifies the addition of other strong gravitational lens codes in the future. HydraLens can also translate a model generated for any of these four software packages into any of the other three. Models created using HydraLens may require slight modifications, since some information may be lost in the translation process. However the computer generated model greatly simplifies the process of developing multiple lens models. HydraLens may enhance the number of direct software comparison studies, and also assist in the education of young investigators in gravitational lens modeling. Future development of HydraLens will further enhance its capabilities.