A Joint Roman Space Telescope and Rubin Observatory Synthetic Wide-Field Imaging Survey

Abstract

We present and validate 20 deg${}^2$ of overlapping synthetic imaging surveys representing the full depth of the Nancy Grace Roman Space Telescope High-Latitude Imaging Survey (HLIS) and five years of observations of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). The two synthetic surveys are summarized, with reference to the existing 300 deg${}^2$ of LSST simulated imaging produced as part of Dark Energy Science Collaboration (DESC) Data Challenge 2 (DC2). Both synthetic surveys observe the same simulated DESC DC2 universe. For the synthetic Roman survey, we simulate for the first time fully chromatic images along with the detailed physics of the Sensor Chip Assemblies derived from lab measurements using the flight detectors. The simulated imaging and resulting pixel-level measurements of photometric properties of objects span a wavelength range of $\sim$0.3 to 2.0 $\mu$m. We also describe updates to the Roman simulation pipeline, changes in how astrophysical objects are simulated relative to the original DC2 simulations, and the resulting simulated Roman data products. We use these simulations to explore the relative fraction of unrecognized blends in LSST images, finding that 20-30% of objects identified in LSST images with $i$-band magnitudes brighter than 25 can be identified as multiple objects in Roman images. These simulations provide a unique testing ground for the development and validation of joint pixel-level analysis techniques of ground- and space-based imaging data sets in the second half of the 2020s -- in particular the case of joint Roman--LSST analyses.

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Cited by in corpus (14)

• Simulating image coaddition with the Nancy Grace Roman Space Telescope: I. Simulation methodology and general results
• OpenUniverse2024: A shared, simulated view of the sky for the next generation of cosmological surveys
• Chromatic Effects on the PSF and Shear Measurement for the Roman Space Telescope High-Latitude Wide Area Survey
• Simulating image coaddition with the Nancy Grace Roman Space Telescope: II. Analysis of the simulated images and implications for weak lensing
• Analysis of biasing from noise from the Nancy Grace Roman Space Telescope: implications for weak lensing
• Simulating image coaddition with the Nancy Grace Roman Space Telescope: III. Software improvements and new linear algebra strategies
• spike: A tool to drizzle HST, JWST, and Roman PSFs for improved analyses
• Spot-Based Measurement of the Brighter-Fatter Effect on a Roman Space Telescope H4RG Detector and Comparison with Flat-Field Data
• Simulating continuum-based redshift measurement in the \textit{Roman's} High Latitude Spectroscopy Survey
• Quantifying Roman WFI Dark Images with the Wavelet Scattering Transform
• Initial Characterization of Stellar Photometry of Roman images from the OpenUniverse Simulations
• Prospects for measuring the Doppler magnification dipole with LSST and DESI
• Optimizing the Roman Space Telescope High-Latitude Wide Area Survey for mitigating chromatic PSF effects on shear measurement
• Emulating redshift mixing due to blending in weak gravitational lensing