The Shear TEsting Programme 2: Factors affecting high precision weak lensing analyses

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dc.creatorMassey, Richard
dc.creatorHeymans, Catherine
dc.creatorBerge, Joel
dc.creatorBernstein, Gary
dc.creatorBridle, Sarah
dc.creatorClowe, Douglas
dc.creatorDahle, Hakon
dc.creatorEllis, Richard
dc.creatorErben, Thomas
dc.creatorHetterscheidt, Marco
dc.creatorHigh, F. William
dc.creatorHirata, Christopher
dc.creatorHoekstra, Henk
dc.creatorHudelot, Patrick
dc.creatorJarvis, Mike
dc.creatorJohnston, David
dc.creatorKuijken, Konrad
dc.creatorMargoniner, Vera
dc.creatorMandelbaum, Rachel
dc.creatorMellier, Yannick
dc.creatorNakajima, Reiko
dc.creatorPaulin-Henriksson, Stephane
dc.creatorPeeples, Molly
dc.creatorRoat, Chris
dc.creatorRefregier, Alexandre
dc.creatorRhodes, Jason
dc.creatorSchrabback, Tim
dc.creatorSchirmer, Mischa
dc.creatorSeljak, Uros
dc.creatorSemboloni, Elisabetta
dc.creatorVan Waerbeke, Ludovic
dc.date2006-08-30
dc.date2006-09-13
dc.date.accessioned2026-07-07T10:23:31Z
dc.date.available2026-07-07T10:23:31Z
dc.descriptionThe Shear TEsting Programme (STEP) is a collaborative project to improve the accuracy and reliability of weak lensing measurement, in preparation for the next generation of wide-field surveys. We review sixteen current and emerging shear measurement methods in a common language, and assess their performance by running them (blindly) on simulated images that contain a known shear signal. We determine the common features of algorithms that most successfully recover the input parameters. We achieve previously unattained discriminatory precision in our analysis, via a combination of more extensive simulations, and pairs of galaxy images that have been rotated with respect to each other, thus removing noise from their intrinsic ellipticities. The robustness of our simulation approach is also confirmed by testing the relative calibration of methods on real data. Weak lensing measurement has improved since the first STEP paper. Several methods now consistently achieve better than 2% precision, and are still being developed. However, the simulations can now distinguish all methods from perfect performance. Our main concern continues to be the potential for a multiplicative shear calibration bias: not least because this can not be internally calibrated with real data. We determine which galaxy populations are responsible and, by adjusting the simulated observing conditions, we also investigate the effects of instrumental and atmospheric parameters. We have isolated several previously unrecognised aspects of galaxy shape measurement, in which focussed development could provide further progress towards the sub-percent level of precision desired for future surveys. [ABRIDGED]
dc.description27 pages, 10 figures, MNRAS submitted
dc.identifierhttps://arxiv.org/abs/astro-ph/0608643
dc.identifierhttp://arxiv.org/abs/astro-ph/0608643
dc.identifierMon.Not.Roy.Astron.Soc.376:13-38,2007
dc.identifierdoi:10.1111/j.1365-2966.2006.11315.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/175856
dc.subjectAstrophysics
dc.titleThe Shear TEsting Programme 2: Factors affecting high precision weak lensing analyses
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