GalSim: The modular galaxy image simulation toolkit

  title={GalSim: The modular galaxy image simulation toolkit},
  author={Barnaby T.P. Rowe and Michael Jarvis and Rachel Mandelbaum and Gary M. Bernstein and James Bosch and Melanie G. Simet and Joshua E. Meyers and Tomasz Kacprzak and Reiko Nakajima and Joe Zuntz and Hironao Miyatake and J. P. Dietrich and Robert Armstrong and Peter Melchior and Mandeep Singh Gill},
  journal={Astron. Comput.},
GALSIM is a collaborative, open-source project aimed at providing an image simulation tool of enduring benefit to the astronomi cal community. It provides a software library for generating images of astronomical objects such as stars and galaxies in a variety of ways, efficiently handling image transformations and opera tions such as convolution and rendering at high precision. We describe the GALSIM software and its capabilities, including necessary theore tical background. We demonstrate that… Expand
Extreme Scale Survey Simulation with Python Workflows
A large- scale workflow that melds together Python code to steer the workflow, Parsl to manage the large-scale distributed execution of workflow components, and containers to carry out the image simulation campaign across multiple sites is described. Expand
Joint survey processing: combined resampling and convolution for galaxy modelling and deblending
We present an extension of the multi-band galaxy fitting method scarlet which allows the joint modeling of astronomical images from different instruments, by performing simultaneous resampling andExpand
Characterization and Photometric Performance of the Hyper Suprime-Cam Software Pipeline
The Subaru Strategic Program (SSP) is an ambitious multi-band survey using the Hyper Suprime-Cam (HSC) on the Subaru telescope. The Wide layer of the SSP is both wide and deep, reaching a detectionExpand
Deep generative models for galaxy image simulations
This work proposes a methodology based on Deep Generative Models to create complex models of galaxy morphologies that may meet the image simulation needs of upcoming surveys, and introduces GalSim-Hub, a community-driven repository of generative models, and a framework for incorporatingGenerative models within the GalSim image simulation software. Expand
Image simulations for gravitational lensing withskylens
We present the latest version of the ray-tracing simulation code SKYLENS, which can be used to develop image simulations that reproduce strong lensing observations by any mass distribution with aExpand
PhoSim-NIRCam: photon-by-photon image simulations of the James Webb Space Telescope’s near-infrared camera
Abstract. Recent instrumentation projects have allocated resources to develop codes for simulating astronomical images. Physics-based models are essential for understanding telescope, instrument, andExpand
Space variant deconvolution of galaxy survey images
Removing the aberrations introduced by the point spread function (PSF) is a fundamental aspect of astronomical image processing. The presence of noise in observed images makes deconvolution aExpand
High-performance Algorithms for Data Analysis in Computational Cosmology
High-performance Algorithms for Data Analysis in Computational Cosmology Esteban Miguel Rangel Modern cosmological simulations are some of the world’s largest and most demanding numericalExpand
Calibrated Ultra Fast Image Simulations for the Dark Energy Survey
Weak lensing by large-scale structure is a powerful technique to probe the dark components of the universe. To understand the measurement process of weak lensing and the associated systematicExpand
Validation of PSF models for HST and other space-based observations
Forthcoming space-based observations will require high-quality point-spread function (PSF) models for weak gravitational lensing measurements. One approach to generating these models is using aExpand


Image analysis for cosmology: results from the GREAT10 Galaxy Challenge
We present the results from the first public blind point-spread function (PSF) reconstruction challenge, the GRavitational lEnsing Accuracy Testing 2010 (GREAT10) Star Challenge. Reconstruction of aExpand
Precision simulation of ground-based lensing data using observations from space
Current and upcoming wide-field, ground-based, broad-band imaging surveys promise to address a wide range of outstanding problems in galaxy formation and cosmology. Several such uses of ground-basedExpand
The COSMOS Survey: Hubble Space Telescope Advanced Camera for Surveys Observations and Data Processing
We describe the details of the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) Wide Field Channel (WFC) observations of the COSMOS field, including the data calibration and processingExpand
Initial Results from a Laboratory Emulation of Weak Gravitational Lensing Measurements
Weak gravitational lensing observations are a key science driver for the NASA Wide Field Infrared Survey Telescope (WFIRST). To validate the performance of the WFIRST infrared detectors, we haveExpand
The GRavitational lEnsing Accuracy Testing 2008 (GREAT08) Challenge focuses on a problem that is of crucial importance for future observations in cosmology. The shapes of distant galaxies can be usedExpand
Results of the GREAT08 Challenge?: an image analysis competition for cosmological lensing: Results o
We present the results of the Gravitational LEnsing Accuracy Testing 2008 (GREAT08) Challenge, a blind analysis challenge to infer weak gravitational lensing shear distortions from images. TheExpand
The GRavitational lEnsing Accuracy Testing 3 (GREAT3) challenge is the third in a series of image analysis challenges, with a goal of testing and facilitating the development of methods for analyzingExpand
Weak Gravitational Lensing with COSMOS: Galaxy Selection and Shape Measurements
With a primary goal of conducting precision weak-lensing measurements from space, the COSMOS survey has imaged the largest contiguous area observed by Hubble Space Telescope to date, using theExpand
Image Analysis for Cosmology: Results from the GREAT10 Star Challenge
In this paper we present results from the weak lensing shape measurement GRavitational lEnsing Accuracy Testing 2010 (GREAT10) Galaxy Challenge. This marks an order of magnitude step change in theExpand
calclens: weak lensing simulations for large-area sky surveys and second-order effects in cosmic shear power spectra
I present a new algorithm, CALCLENS, for efficiently computing weak gravitational lensing shear signals from large N-body light cone simulations over a curved sky. This new algorithm properlyExpand