Open access
Date
2018-11Type
- Journal Article
Abstract
We 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 a maximum-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 1σ uncertainties in multiplicative shear calibration to be 0.013 and 0.025 for the METACALIBRATION and IM3SHAPE catalogues, respectively. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000300219Publication status
publishedExternal links
Journal / series
Monthly Notices of the Royal Astronomical SocietyVolume
Pages / Article No.
Publisher
Oxford University PressSubject
Gravitational lensing: weak; Methods: data analysis; Techniques: image processing; Catalogues; Surveys; Cosmology: observationsOrganisational unit
03928 - Refregier, Alexandre / Refregier, Alexandre
Notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.More
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