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Dark Energy Survey Year 1 results: validation of weak lensing cluster member contamination estimates from P(z) decomposition

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posted on 2023-06-09, 19:21 authored by T N Varga, J DeRose, D Gruen, T McClintock, S Seitz, E Rozo, M Constanzi, B Hoyle, N MacCrann, A A Plazas, E S Rykoff, M Simet, A von der Linden, R H Wechsler, Kathy RomerKathy Romer, DES Collaboration, others
Weak lensing source galaxy catalogues used in estimating the masses of galaxy clusters can be heavily contaminated by cluster members, prohibiting accurate mass calibration. In this study, we test the performance of an estimator for the extent of cluster member contamination based on decomposing the photometric redshift P(z) of source galaxies into contaminating and background components. We perform a full scale mock analysis on a simulated sky survey approximately mirroring the observational properties of the Dark Energy Survey Year One observations (DES Y1), and ?nd excellent agreement between the true number pro?le of contaminating cluster member galaxies in the simulation and the estimated one. We further apply the method to estimate the cluster member contamination for the DES Y1 redMaPPer cluster mass calibration analysis, and compare the results to an alternative approach based on the angular correlation of weak lensing source galaxies. We ?nd indications that the correlation based estimates are biased by the selection of the weak lensing sources in the cluster vicinity, which does not strongly impact the P(z) decomposition method. Collectively, these benchmarks demonstrate the strength of the P(z) decomposition method in alleviating membership contamination and enabling highly accurate cluster weak lensing studies without broad exclusion of source galaxies, thereby improving the total constraining power of cluster mass calibration via weak lensing.

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Wiley-Blackwell

Issue

2

Volume

489

Page range

2511-2524

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2019-10-15

First Open Access (FOA) Date

2019-10-15

First Compliant Deposit (FCD) Date

2019-10-14

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