superbit-lensing

A pipeline for weak gravitational lensing analysis of SuperBIT observations, performing ngmix fits (including metacalibration) on real and simulated images.

Pipeline overview

The pipeline is organized into five submodules within superbit_lensing, each of which can be used independently:

Module	Description
galsim	Generates simulated SuperBIT observations for validation with Gaussian and SuperBIT PSFs
medsmaker	Builds coadd images, runs SExtractor & PSFEx, and produces MEDS files
metacalibration	Runs ngmix/metacalibration on MEDS files from Medsmaker
shear-profiles	Computes tangential/cross shear profiles and outputs results to file
color	Makes registered coadds for u, b, g bands and obtains photometry via SExtractor dual-mode

Each module directory contains more detailed documentation.

Data access

The data is not yet public. It currently lives on the UofT server hen. Contact Emaad Paracha to request an account. Once you have access, the pipeline is plug-and-play.

Installation

Disk space: setup will ask for a data_dir and simulation_dir. Make sure you have ~50 GB available before starting.

git clone https://github.com/superbit-collaboration/superbit-lensing.git
cd superbit-lensing
make install ENV_NAME=sblens
conda activate sblens

make install automatically runs post_installation.py, which will prompt you to configure your data and simulation paths and download the required PSF files and catalogs.

Questions / issues

Open a GitHub issue or reach out to any contributor.