Zuntz, J;
Sheldon, E;
Samuroff, S;
Troxel, MA;
Jarvis, M;
MacCrann, N;
Gruen, D;
... Zhang, Y; + view all
(2018)
Dark Energy Survey Year 1 results: weak lensing shape catalogues.
Monthly Notices of the Royal Astronomical Society
, 481
(1)
pp. 1149-1182.
10.1093/mnras/sty2219.
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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.
| Type: | Article |
|---|---|
| Title: | Dark Energy Survey Year 1 results: weak lensing shape catalogues |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/sty2219 |
| Publisher version: | https://doi.org/10.1093/mnras/sty2219 |
| Language: | English |
| Additional information: | This version is the version of the record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | gravitational lensing: weak, methods: data analysis, techniques: image processing, catalogues, surveys, cosmology: observations |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1571419 |
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