Validation of Selection Function, Sample Contamination and Mass Calibration in Galaxy Cluster Samples
Abstract
We construct and validate the selection function of the MARD-Y3 sample. This sample was selected through optical follow-up of the 2nd ROSAT faint source catalog (2RXS) with Dark Energy Survey year 3 (DES-Y3) data. The selection function is modeled 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 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 modeling 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.
Cite
@article{arxiv.2002.10834,
title = {Validation of Selection Function, Sample Contamination and Mass Calibration in Galaxy Cluster Samples},
author = {S. Grandis and M. Klein and J. J. Mohr and S. Bocquet and M. Paulus and T. M. C. Abbott and M. Aguena and S. Allam and J. Annis and B. A. Benson and E. Bertin and S. Bhargava and D. Brooks and D. L. Burke and A. Carnero Rosell and M. Carrasco Kind and J. Carretero and R. Capasso and M. Costanzi and L. N. da Costa and J. De Vicente and S. Desai and J. P. Dietrich and P. Doel and T. F. Eifler and S. Everett and A. E. Evrard and B. Flaugher and P. Fosalba and J. Frieman and J. García-Bellido and E. Gaztanaga and D. W. Gerdes and D. Gruen and R. A. Gruendl and J. Gschwend and G. Gutierrez and W. G. Hartley and S. R. Hinton and D. L. Hollowood and K. Honscheid and D. J. James and T. Jeltema and K. Kuehn and N. Kuropatkin and M. Lima and M. A. G. Maia and J. L. Marshall and P. Melchior and F. Menanteau and R. Miquel and R. L. C. Ogando and A. Palmese and F. Paz-Chinchón and A. A. Plazas and A. K. Romer and A. Roodman and E. Sanchez and A. Saro and V. Scarpine and M. Schubnell and S. Serrano and E. Sheldon and M. Smith and A. Stark and E. Suchyta and M. E. C. Swanson and G. Tarle and D. Thomas and D. L. Tucker and T. N. Varga and J. Weller and R. D. Wilkinson},
journal= {arXiv preprint arXiv:2002.10834},
year = {2020}
}
Comments
28 pages, 23 figure