Kathy Romer 49-Published-11.08.20.pdf (4.5 MB)
Validation of selection function, sample contamination and mass calibration in galaxy cluster samples
journal contribution
posted on 2023-06-09, 22:48 authored by S Grandis, M Klein, J J Mohr, S Bocquet, M Paulus, T M C Abbott, M Aguena, S Allam, J Annis, B A Benson, E Bertin, Sunayana Bhargava, D Brooks, Kathy RomerKathy Romer, Reese WilkinsonReese Wilkinson, othersWe construct and validate the selection function of the MARD-Y3 galaxy cluster sample. This sample was selected through optical follow-up of the 2nd ROSAT faint source catalogue with Dark Energy Survey year 3 data. The selection function is modelled by combining an empirically constructed X-ray selection function with an incompleteness model for the optical follow-up. We validate the joint selection function by testing the consistency of the constraints on the X-ray flux-mass and richness-mass scaling relation parameters derived from different sources of mass information: (1) cross-calibration using South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) clusters, (2) calibration using number counts in X-ray, in optical and in both X-ray and optical while marginalizing over cosmological parameters, and (3) other published analyses. We find that the constraints on the scaling relation from the number counts and SPT-SZ cross-calibration agree, indicating that our modelling of the selection function is adequate. Furthermore, we apply a largely cosmology independent method to validate selection functions via the computation of the probability of finding each cluster in the SPT-SZ sample in the MARD-Y3 sample and vice versa. This test reveals no clear evidence for MARD-Y3 contamination, SPT-SZ incompleteness or outlier fraction. Finally, we discuss the prospects of the techniques presented here to limit systematic selection effects in future cluster cosmological studies.
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- Published
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- Published version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
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1Volume
498Page range
771-798Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2021-01-19First Open Access (FOA) Date
2021-01-19First Compliant Deposit (FCD) Date
2021-01-18Usage metrics
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