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A synthetic Roman Space Telescope High-Latitude Imaging Survey: simulation suite and the impact of wavefront errors on weak gravitational lensing

Troxel, M. A. and Long, H. and Hirata, C. M. and Choi, A. and Jarvis, M. and Mandelbaum, R. and Wang, K. and Yamamoto, M. and Hemmati, S. and Capak, P. (2021) A synthetic Roman Space Telescope High-Latitude Imaging Survey: simulation suite and the impact of wavefront errors on weak gravitational lensing. Monthly Notices of the Royal Astronomical Society, 501 (2). pp. 2044-2070. ISSN 0035-8711. doi:10.1093/mnras/staa3658.

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The Nancy Grace Roman Space Telescope (Roman) mission is expected to launch in the mid-2020s. Its weak lensing program is designed to enable unprecedented systematics control in photometric measurements, including shear recovery, point spread function (PSF) correction, and photometric calibration. This will enable exquisite weak lensing science and allow us to adjust to and reliably contribute to the cosmological landscape after the initial years of observations from other concurrent Stage IV dark energy experiments. This potential requires equally careful planning and requirements validation as the mission prepares to enter its construction phase. We present a suite of image simulations based on GALSIM that are used to construct a complex, synthetic Roman weak lensing survey that incorporates realistic input galaxies and stars, relevant detector non-idealities, and the current reference 5-yr Roman survey strategy. We present a first study to empirically validate the existing Roman weak lensing requirements flowdown using a suite of 12 matched image simulations, each representing a different perturbation to the wavefront or image motion model. These are chosen to induce a range of potential static and low- and high-frequency time-dependent PSF model errors. We analyse the measured shapes of galaxies from each of these simulations and compare them to a reference, fiducial simulation to infer the response of the shape measurement to each of these modes in the wavefront model. We then compare this to existing analytic flowdown requirements, and find general agreement between the empirically derived response and that predicted by the analytic model.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Troxel, M. A.0000-0002-5622-5212
Hirata, C. M.0000-0002-2951-4932
Jarvis, M.0000-0001-7039-9078
Mandelbaum, R.0000-0003-2271-1527
Hemmati, S.0000-0003-2226-5395
Capak, P.0000-0003-3578-6843
Alternate Title:A Synthetic WFIRST High-Latitude Imaging Survey: Simulation Suite and the Impact of Wavefront Errors on Weak Gravitational Lensing
Additional Information:© 2020 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2020 November 12. Received 2020 October 19; in original form 2019 December 19. Published: 24 November 2020. We thank Dave Content, Jeff Kruk, Alice Liu, Hui Kong, and Erin Sheldon for many useful conversations, and the anonymous referee for insightful suggestions. This work supported by NASA Grant 15-WFIRST15-0008 as part of the Roman Cosmology with the High-Latitude Survey Science Investigation Team ( It used resources on the CCAPP condo of the Ruby Cluster at the Ohio Supercomputing Center (OSC 1987). This research was also done using resources provided by the Open Science Grid (Pordes et al. 2007; Sfiligoi et al. 2009), which is supported by the National Science Foundation and the U.S. Department of Energy’s Office of Science. Plots in this manuscript were produced partly with MATPLOTLIB (Hunter 2007), and it has been prepared using NASA’s Astrophysics Data System Bibliographic Services. Data Availability: The data underlying this article and further supporting documentation will be shared upon request to the corresponding author. Details are provided in Appendix C.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:gravitational lensing: weak – techniques: image processing – large-scale structure of Universe
Issue or Number:2
Record Number:CaltechAUTHORS:20210211-143621985
Persistent URL:
Official Citation:M A Troxel, H Long, C M Hirata, A Choi, M Jarvis, R Mandelbaum, K Wang, M Yamamoto, S Hemmati, P Capak, A synthetic Roman Space Telescope High-Latitude Imaging Survey: simulation suite and the impact of wavefront errors on weak gravitational lensing, Monthly Notices of the Royal Astronomical Society, Volume 501, Issue 2, February 2021, Pages 2044–2070,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108010
Deposited By: Tony Diaz
Deposited On:11 Feb 2021 23:09
Last Modified:16 Nov 2021 19:08

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