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Dark Energy Survey Year 1 results: validation of weak lensing cluster member contamination estimates from P(z) decomposition
journal contribution
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, othersWeak 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 SocietyISSN
0035-8711Publisher
Wiley-BlackwellExternal DOI
Issue
2Volume
489Page range
2511-2524Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2019-10-15First Open Access (FOA) Date
2019-10-15First Compliant Deposit (FCD) Date
2019-10-14Usage metrics
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