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Dark Energy Surveyed Year 1 results: calibration of cluster mis-centring in the redMaPPer catalogues
journal contribution
posted on 2023-06-09, 18:47 authored by Y Zhang, T Jeltema, D L Hollowood, S Everett, E Rozo, A Farahi, Alberto Bermeo, Sunayana Bhargava, Paul GilesPaul Giles, Kathy RomerKathy Romer, Reese WilkinsonReese Wilkinson, M Splettstoesser, Julian Mayers, Carlos Fernando Vergara Cervantes, DES Collaboration, othersThe centre determination of a galaxy cluster from an optical cluster finding algorithm can be offset from theoretical prescriptions or N-body definitions of its host halo centre. These offsets impact the recovered cluster statistics, affecting both richness measurements and the weak lensing shear profile around the clusters. This paper models the centring performance of the redMaPPer cluster finding algorithm using archival X-ray observations of redMaPPer selected clusters. Assuming the X-ray emission peaks as the fiducial halo centres, and through analysing their offsets to the redMaPPer centres, we find that ~75 ± 8 per cent of the redMaPPer clusters are well centred and the mis-centred offset follows a Gamma distribution in normalized, projected distance. These mis-centring offsets cause a systematic underestimation of cluster richness relative to the well-centred clusters, for which we propose a descriptive model. Our results enable the DES Y1 cluster cosmology analysis by characterizing the necessary corrections to both the weak lensing and richness abundance functions of the DES Y1 redMaPPer cluster catalogue.
History
Publication status
- Published
File Version
- Published version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
2Volume
487Page range
2578-2593Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2019-09-13First Open Access (FOA) Date
2019-09-13First Compliant Deposit (FCD) Date
2019-08-28Usage metrics
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