Validation of selection function, sample contamination and mass calibration in galaxy cluster samples. Issue 1 (11th August 2020)

• Record Type: Journal Article
• Authors: Grandis, S; Klein, M; Mohr, J J; Bocquet, S; Paulus, M; Abbott, T M C; Aguena, M; Allam, S; Annis, J; Benson, B A; Bertin, E; Bhargava, S; Brooks, D; Burke, D L; Carnero Rosell, A; Carrasco Kind, M; Carretero, J; Capasso, R; Costanzi, M; da Costa, L N; De Vicente, J; Desai, S; Dietrich, J P; Doel, P; Eifler, T F; Evrard, A E; Flaugher, B; Fosalba, P; Frieman, J; García-Bellido, J; Gaztanaga, E; Gerdes, D W; Gruen, D; Gruendl, R A; Gschwend, J; Gutierrez, G; Hartley, W G; Hinton, S R; Hollowood, D L; Honscheid, K; James, D J; Jeltema, T; Kuehn, K; Kuropatkin, N; Lima, M; Maia, M A G; Marshall, J L; Melchior, P; Menanteau, F; Miquel, R; Ogando, R L C; Palmese, A; Paz-Chinchón, F; Plazas, A A; Romer, A K; Roodman, A; Sanchez, E; Saro, A; Scarpine, V; Schubnell, M; Serrano, S; Sheldon, E; Smith, M; Stark, A A; Suchyta, E; Swanson, M E C; Tarle, G; Thomas, D; Tucker, D L; Varga, T N; Weller, J; Wilkinson, R;
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 498:Issue 1(2020)
• Page Start: 771
• Page End: 798
• Publication Date: 2020-08-11
• Subjects: methods: statistical -- galaxies: clusters: general -- large-scale structure of Universe -- X-rays: galaxies: clusters; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa2333
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We 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.