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Dark energy survey year 1 results: weak lensing shape catalogues
journal contribution
posted on 2023-06-09, 15:10 authored by J Zuntz, E Sheldon, S Samuroff, M A Troxel, M Jarvis, N MacCrann, D Gruen, J Prat, C Sánchez, A Choi, Kathy RomerKathy Romer, DES CollaborationWe present two galaxy shape catalogues from the Dark Energy Survey Year 1 data set, covering 1500 deg2 with a median redshift of 0.59. The catalogues cover two main fields: Stripe 82, and an area overlapping the South Pole Telescope survey region. We describe our data analysis process and in particular our shape measurement using two independent shear measurement pipelines, METACALIBRATION and IM3SHAPE. The METACALIBRATION catalogue uses a Gaussian model with an innovative internal calibration scheme, and was applied to riz bands, yielding 34.8M objects. The IM3SHAPE catalogue uses amaximum-likelihood bulge/disc model calibrated using simulations, and was applied to r-band data, yielding 21.9M objects. Both catalogues pass a suite of null tests that demonstrate their fitness for use in weak lensing science. We estimate the 1s uncertainties in multiplicative shear calibration to be 0.013 and 0.025 for the METACALIBRATION and IM3SHAPE catalogues, respectively.
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Publication status
- Published
File Version
- Published version
Journal
Royal Astronomical SocietyISSN
0035-8711Publisher
University Oxford PressExternal DOI
Issue
1Volume
481Page range
1149-1182Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Astronomy Centre Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2018-09-24First Open Access (FOA) Date
2018-09-24First Compliant Deposit (FCD) Date
2018-09-21Usage metrics
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