Kavli Affiliate: John D. Silverman
| First 5 Authors: Xuheng Ding, Simon Birrer, Tommaso Treu, John D. Silverman,
| Summary:
Galight is a Python-based open-source package that can be used to perform
two-dimensional model fitting of optical and near-infrared images to
characterize the light distribution of galaxies with components including a
disk, bulge, bar, and quasar. The decomposition of stellar components has been
demonstrated in published studies of inactive galaxies and quasar host galaxies
observed by the Hubble Space Telescope and Subaru’s Hyper Suprime-Cam. Galight
utilizes the image modeling capabilities of lenstronomy while redesigning the
user interface for the analysis of large samples of extragalactic sources. The
package is user-friendly with some automatic features such as determining the
cutout size of the modeling frame, searching for PSF-stars in field-of-view,
estimating the noise map of the data, identifying all the objects to set the
initial model, and associated parameters to fit them simultaneously. These
features minimize the manpower and allow the automatic fitting tasks. The
software is distributed under the MIT license. The source code, installation
guidelines, and example notebooks code can be found at
https://galight.readthedocs.io/en/latest/
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