GREAT3 results - I. Systematic errors in shear estimation and the impact of real galaxy morphology

Mandelbaum, R.; Rowe, B.; Armstrong, R.; Bard, D.; Bertin, E.; Bosch, J.; Boutigny, D.; Courbin, F.; Dawson, W. A.; Donnarumma, A.; Fenech Conti, I.; Gavazzi, R.; Gentile, M.; Gill, M. S.  S.; Hogg, D. W.; Huff, E. M.; Jee, M. J.; Kacprzak, T.; Kilbinger, M.; Kuntzer, T.; Lang, D.; Luo, W.; March, M. C.; Marshall, P. J.; Meyers, J. E.; Miller, L.; Miyatake, H.; Nakajima, R.; Ngole Mboula, F. M.; Nurbaeva, G.; Okura, Y.; Paulin-Henriksson, S.; Rhodes, J.; Schneider, M. D.; Shan, H.; Sheldon, E. S.; Simet, M.; Starck, J. -L.; Sureau, F.; Tewes, M.; Zarb Adami, K.; Zhang, J.; Zuntz, J.

doi:10.1093/mnras/stv781

Title: GREAT3 results - I. Systematic errors in shear estimation and the impact of real galaxy morphology

Journal Article · Fri May 01 00:00:00 EDT 2015 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stv781· OSTI ID:1335085

Mandelbaum, R.; Rowe, B.; Armstrong, R.; Bard, D.; Bertin, E.; Bosch, J.; Boutigny, D.; Courbin, F.; Dawson, W. A.; Donnarumma, A.; Fenech Conti, I.; Gavazzi, R.; Gentile, M.; Gill, M. S. S.; Hogg, D. W.; Huff, E. M.; Jee, M. J.; Kacprzak, T.; Kilbinger, M.; Kuntzer, T. more »

We present first results from the third GRavitational lEnsing Accuracy Testing (GREAT3) challenge, the third in a sequence of challenges for testing methods of inferring weak gravitational lensing shear distortions from simulated galaxy images. GREAT3 was divided into experiments to test three specific questions, and included simulated space- and ground-based data with constant or cosmologically varying shear fields. The simplest (control) experiment included parametric galaxies with a realistic distribution of signal-to-noise, size, and ellipticity, and a complex point spread function (PSF). The other experiments tested the additional impact of realistic galaxy morphology, multiple exposure imaging, and the uncertainty about a spatially varying PSF; the last two questions will be explored in Paper II. The 24 participating teams competed to estimate lensing shears to within systematic error tolerances for upcoming Stage-IV dark energy surveys, making 1525 submissions overall. GREAT3 saw considerable variety and innovation in the types of methods applied. Several teams now meet or exceed the targets in many of the tests conducted (to within the statistical errors). We conclude that the presence of realistic galaxy morphology in simulations changes shear calibration biases by ~1 per cent for a wide range of methods. Other effects such as truncation biases due to finite galaxy postage stamps, and the impact of galaxy type as measured by the Sérsic index, are quantified for the first time. Our results generalize previous studies regarding sensitivities to galaxy size and signal-to-noise, and to PSF properties such as seeing and defocus. Almost all methods’ results support the simple model in which additive shear biases depend linearly on PSF ellipticity.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC02-76SF00515

OSTI ID:: 1335085

Report Number(s):: SLAC-PUB-16749; arXiv:1412.1825

Journal Information:: Monthly Notices of the Royal Astronomical Society, Vol. 450, Issue 3; ISSN 0035-8711

Publisher:: Royal Astronomical Society

Country of Publication:: United States

Language:: English

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The effect of detector nonlinearity on WFIRST PSF profiles for weak gravitational lensing measurements Plazas, Andrés. A.; Shapiro, Charles A.; Kannawadi, Arun arXiv https://doi.org/10.48550/arxiv.1605.01001	text	January 2016
KiDS-450: Cosmological parameter constraints from tomographic weak gravitational lensing Hildebrandt, H.; Viola, M.; Heymans, C. arXiv https://doi.org/10.48550/arxiv.1606.05338	text	January 2016
Dark Energy Survey Year 1 Results: The Impact of Galaxy Neighbours on Weak Lensing Cosmology with im3shape Samuroff, S.; Bridle, S. L.; Zuntz, J. arXiv https://doi.org/10.48550/arxiv.1708.01534	text	January 2017
Removing the Impact of Correlated PSF Uncertainties in Weak Lensing Lu, Tianhuan; Zhang, Jun; Dong, Fuyu arXiv https://doi.org/10.48550/arxiv.1712.09736	text	January 2017
Evidence for radial variations in the stellar mass-to-light ratio of massive galaxies from weak and strong lensing Sonnenfeld, Alessandro; Leauthaud, Alexie; Auger, Matthew W. arXiv https://doi.org/10.48550/arxiv.1801.01883	text	January 2018
Radio Galaxy Shape Measurement with Hamiltonian Monte Carlo in the Visibility Domain Rivi, M.; Lochner, M.; Balan, S. T. arXiv https://doi.org/10.48550/arxiv.1805.06799	text	January 2018
Constraints on Cosmology and Baryonic Feedback with the Deep Lens Survey Using Galaxy-Galaxy and Galaxy-Mass Power Spectra Yoon, Mijin; Jee, M. James; Tyson, J. Anthony arXiv https://doi.org/10.48550/arxiv.1807.09195	text	January 2018
Testing Shear Recovery with Field Distortion Zhang, Jun; Dong, Fuyu; Li, Hekun arXiv https://doi.org/10.48550/arxiv.1808.02593	text	January 2018
A Unified Analysis of Four Cosmic Shear Surveys Chang, Chihway; Wang, Michael; Dodelson, Scott arXiv https://doi.org/10.48550/arxiv.1808.07335	text	January 2018
Towards emulating cosmic shear data: Revisiting the calibration of the shear measurements for the Kilo-Degree Survey Kannawadi, Arun; Hoekstra, Henk; Miller, Lance arXiv https://doi.org/10.48550/arxiv.1812.03983	text	January 2018
Euclid Preparation IV. Impact of undetected galaxies on weak-lensing shear measurements Collaboration, Euclid; Martinet, N.; Schrabback, T. arXiv https://doi.org/10.48550/arxiv.1902.00044	text	January 2019
Galaxy shape measurement with convolutional neural networks Ribli, Dezső; Dobos, László; Csabai, István arXiv https://doi.org/10.48550/arxiv.1902.08161	text	January 2019
The galaxy cluster mass scale and its impact on cosmological constraints from the cluster population Pratt, G. W.; Arnaud, M.; Biviano, A. arXiv https://doi.org/10.48550/arxiv.1902.10837	text	January 2019

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