Cosmological constraints from DES Y1 cluster abundances and SPT multiwavelength data

Costanzi, M. and Saro, A. and Bocquet, S. and Abbott, T. M. C. and Aguena, M. and Allam, S. and Amara, A. and Annis, J. and Avila, S. and Bacon, D. and Benson, B. A. and Bhargava, S. and Brooks, D. and Buckley-Geer, E. and Burke, D. L. and Carnero Rosell, A. and Carrasco Kind, M. and Carretero, J. and Choi, A. and da Costa, L. N. and Pereira, M. E. S. and De Vicente, J. and Desai, Shantanu and Diehl, H. T. and Dietrich, J. P. and Doel, P. and Eifler, T. F. and Everett, S. and Ferrero, I. and Ferté, A. and Flaugher, B. and Fosalba, P. and Frieman, J. and García-Bellido, J. and Gaztanaga, E. and Gerdes, D. W. and Giannantonio, T. and Giles, P. and Grandis, S. and Gruen, D. and Gruendl, R. A. and Gupta, N. and Gutierrez, G. and Hartley, W. G. and Hinton, S. R. and Hollowood, D. L. and Honscheid, K. and James, D. J. and Jeltema, T. and Krause, E. and Kuehn, K. and Kuropatkin, N. and Lahav, O. and Lima, M. and MacCrann, N. and Maia, M. A. G. and Marshall, J. L. and Menanteau, F. and Miquel, R. and Mohr, J. J. and Morgan, R. and Myles, J. and Ogando, R. L. C. and Palmese, A. and Paz-Chinchón, F. and Plazas, A. A. and Rapetti, D. and Reichardt, C. L. and Romer, A. K. and Roodman, A. and Ruppin, F. and Salvati, L. and Samuroff, S. and Sanchez, E. and Scarpine, V. and Serrano, S. and Sevilla-Noarbe, I. and Singh, P. and Smith, M. and Soares-Santos, M. and Stark, A. A. and Suchyta, E. and Swanson, M. E. C. and Tarle, G. and Thomas, D. and To, C. and Tucker, D. L. and Varga, T. N. and Wechsler, R. H. and Zhang, Z. (2021) Cosmological constraints from DES Y1 cluster abundances and SPT multiwavelength data. Physical Review D, 103 (4). ISSN 2470-0010

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Abstract

We perform a joint analysis of the counts of redMaPPer clusters selected from the Dark Energy Survey (DES) year 1 data and multiwavelength follow-up data collected within the 2500 deg2 South Pole Telescope (SPT) Sunyaev-Zel'dovich (SZ) survey. The SPT follow-up data, calibrating the richness-mass relation of the optically selected redMaPPer catalog, enable the cosmological exploitation of the DES cluster abundance data. To explore possible systematics related to the modeling of projection effects, we consider two calibrations of the observational scatter on richness estimates: a simple Gaussian model which account only for the background contamination (BKG), and a model which further includes contamination and incompleteness due to projection effects (PRJ). Assuming either a ΛCDM+mν or wCDM+mν cosmology, and for both scatter models, we derive cosmological constraints consistent with multiple cosmological probes of the low and high redshift Universe, and in particular with the SPT cluster abundance data. This result demonstrates that the DES Y1 and SPT cluster counts provide consistent cosmological constraints, if the same mass calibration data set is adopted. It thus supports the conclusion of the DES Y1 cluster cosmology analysis which interprets the tension observed with other cosmological probes in terms of systematics affecting the stacked weak lensing analysis of optically selected low-richness clusters. Finally, we analyze the first combined optically SZ selected cluster catalog obtained by including the SPT sample above the maximum redshift probed by the DES Y1 redMaPPer sample (z=0.65). Besides providing a mild improvement of the cosmological constraints, this data combination serves as a stricter test of our scatter models: the PRJ model, providing scaling relations consistent between the two abundance and multiwavelength follow-up data, is favored over the BKG model.

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