Combining Planck and SPT Cluster Catalogs: Cosmological Analysis and Impact on the Planck Scaling Relation Calibration

• Published in: The Astrophysical Journal
• Main Authors: Salvati, L., Saro, A., Bocquet, S., Costanzi, M., Ansarinejad, B., Benson, B. A., Bleem, L. E., Calzadilla, M. S., Carlstrom, J. E., Chang, C. L., Chown, R., Crites, A. T., de Haan, T., Dobbs, M. A., Everett, W. B., Floyd, B., Grandis, S., George, E. M., Halverson, N. W., Holder, G. P., Holzapfel, W. L., Hrubes, J. D., Lee, A. T., Luong-Van, D., McDonald, M., McMahon, J. J., Meyer, S. S., Millea, M., Mocanu, L. M., Mohr, J. J., Natoli, T., Omori, Y., Padin, S., Pryke, C., Reichardt, C. L., Ruhl, J. E., Ruppin, F., Schaffer, K. K., Schrabback, T., Shirokoff, E., Staniszewski, Z., Stark, A. A., Vieira, J. D., Williamson, R.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: American Astronomical Society 2022
• Subjects: Cosmology; Large-scale structure of the universe; Galaxy cluster counts; Space and Planetary Science; Astronomy and Astrophysics; South Pole; South pole
• Online Access: https://doi.org/10.3847/1538-4357/ac7ab4

We provide the first combined cosmological analysis of South Pole Telescope (SPT) and Planck cluster catalogs. The aim is to provide an independent calibration for Planck scaling relations, exploiting the cosmological constraining power of the SPT-SZ cluster catalog and its dedicated weak lensing (WL) and X-ray follow-up observations. We build a new version of the Planck cluster likelihood. In the νΛCDM scenario, focusing on the mass slope and mass bias of Planck scaling relations, we find α_(SZ) = 1.49^(+0.07)_(−0.10) and (1−b)_(SZ) = 0.69^(+0.07)_(−0.14) respectively. The results for the mass slope show a ∼4σ departure from the self-similar evolution, α_(SZ) ∼1.8. This shift is mainly driven by the matter density value preferred by SPT data, Ω_m = 0.30 ± 0.03, lower than the one obtained by Planck data alone, Ω_m = 0.37^(+0.02)_(−0.06). The mass bias constraints are consistent both with outcomes of hydrodynamical simulations and external WL calibrations, (1−b) ∼ 0.8, and with results required by the Planck cosmic microwave background cosmology, (1−b) ∼ 0.6. From this analysis, we obtain a new catalog of Planck cluster masses M₅₀₀. We estimate the relation between the published Planck derived M_(SZ) masses and our derived masses, as a "measured mass bias," (1-b)_M. We analyze the mass, redshift, and detection noise dependence of (1-b)_M, finding an increasing trend toward high redshift and low mass. These results mimic the effect of departure from self-similarity in cluster evolution, showing different dependencies for the low-mass, high-mass, low-z, and high-z regimes. © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 December 7; revised 2022 May 9; accepted 2022 June 14; published 2022 August 1. The ...