Grandis, S;
Klein, M;
Mohr, JJ;
Bocquet, S;
Paulus, M;
Abbott, TMC;
Aguena, M;
... Wilkinson, R; + view all
(2020)
Validation of selection function, sample contamination and mass calibration in galaxy cluster samples.
Monthly Notices of the Royal Astronomical Society
, 498
(1)
pp. 771-798.
10.1093/mnras/staa2333.
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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.
| Type: | Article |
|---|---|
| Title: | Validation of selection function, sample contamination and mass calibration in galaxy cluster samples |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/staa2333 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/staa2333 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | methods: statistical, galaxies: clusters: general, large-scale structure of Universe, X-rays: galaxies: clusters, SOUTH-POLE TELESCOPE, DARK ENERGY SURVEY, WEAK-LENSING ANALYSIS, X-RAY, SCALING RELATIONS, COSMOLOGICAL PARAMETERS, CATALOG, XMM, CONSTRAINTS, GIANTS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10117092 |
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