Cosmological constraints from des Y1 cluster abundances and SPT multiwavelength data

• Published in: Physical Review D
• Main Authors: Costanzi, M., Ávila, Sergio, Fosalba, Pablo, García-Bellido, Juan, Gaztañaga, Enrique, Serrano, S., Zhang, Z., DES Collaboration, SPT Collaboration
• Other Authors: Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), European Commission, Generalitat de Catalunya, Instituto Nacional de Ciência e Tecnologia (Brasil), National Science Foundation (US)
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: American Physical Society 2021
• Subjects: Cosmological parameters; Large-scale structure of the Universe; Galaxy clusters; Gravitation; Cosmology and Astrophysics; South Pole; South pole
• Online Access: http://hdl.handle.net/10261/256009; https://doi.org/10.1103/PhysRevD.103.043522; https://doi.org/10.13039/501100000780; https://doi.org/10.13039/501100002809; https://doi.org/10.13039/501100003329; https://doi.org/10.13039/100000001

Costanzi, M., et al. DES and SPT Collaborations 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. Funding for the DES Projects has been provided by the U.S. Department of Energy, the ...