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Measurement of the Full Shape of the Thermal Sunyaev–Zel’dovich Power Spectrum from the South Pole Telescope and Herschel–SPIRE Observations

  • Authors: S. Raghunathan, P. A. R. Ade, D. Anbajagane, A. J. Anderson, B. Ansarinejad, M. Archipley, J. E. Austermann, L. Balkenhol, D. R. Barron, P. S. Barry, J. A. Beall, K. Benabed, A. N. Bender, B. A. Benson, F. Bianchini, L. E. Bleem, J. Bock, S. Bocquet, F. R. Bouchet, L. Bryant, E. Camphuis, M. G. Campitiello, J. E. Carlstrom, J. Carron, C. L. Chang, P. Chaubal, H. C. Chiang, P. M. Chichura, A. Chokshi, T.-L. Chou, R. Citron, A. Coerver, C. Corbett Moran, T. M. Crawford, A. T. Crites, C. Daley, T. de Haan, K. R. Dibert, M. A. Dobbs, M. Doohan, A. Doussot, D. Dutcher, W. Everett, C. Feng, K. R. Ferguson, N. C. Ferree, K. Fichman, A. Foster, S. Galli, J. Gallicchio, A. E. Gambrel, A. K. Gao, R. W. Gardner, F. Ge, E. M. George, N. Goeckner-Wald, R. Gualtieri, F. Guidi, S. Guns, N. Gupta, N. W. Halverson, E. Hivon, A. Y. Q. Ho, G. P. Holder, W. L. Holzapfel, J. C. Hood, J. D. Hrubes, A. Hryciuk, N. Huang, J. Hubmayr, K. D. Irwin, T. Jhaveri, F. Kéruzoré, A. R. Khalife, L. Knox, M. Korman, K. Kornoelje, C.-L. Kuo, A. T. Lee, K. Levy, Y. Li, D. Li, A. E. Lowitz, A. Lowitz, C. Lu, G. P. Lynch, T. J. Maccarone, A. S. Maniyar, E. S. Martsen, J. J. McMahon, F. Menanteau, M. Millea, J. Montgomery, Y. Nakato, T. Natoli, J. P. Nibarger, G. I. Noble, V. Novosad, Y. Omori, A. Ouellette, S. Padin, Z. Pan, P. Paschos, S. Patil, K. A. Phadke, A. W. Pollak, K. Prabhu, C. Pryke, W. Quan, M. Rahimi, A. Rahlin, C. L. Reichardt, M. Rouble, J. E. Ruhl, B. R. Saliwanchik, K. K. Schaffer, E. Schiappucci, C. Sievers, A. C. Silva Oliveira, A. Simpson, G. Smecher, J. A. Sobrin, A. A. Stark, J. Stephen, C. Tandoi, B. Thorne, C. Trendafilova, C. Tucker, C. Umilta, T. Veach, J. D. Vieira, A. G. Vieregg, M. P. Viero, A. Vitrier, Y. Wan, G. Wang, N. Whitehorn, W. L. K. Wu, V. Yefremenko, M. R. Young, J. A. Zebrowski, M. Zemcov

S. Raghunathan et al 2026 The Astrophysical Journal Letters 1002 .

  • Provider: AAS Journals

Caption: Figure 4.

The tSZ power spectra measured at 9.3σ using the CIB-min maps is shown in green. The error bars include contributions from both statistical and systematic errors, and have significant off-diagonal correlations due to the non-Gaussian nature of the signals. We also show the results from Planck (PR4) as yellow hexagons; ACT (DR6) as a teal octagon; SPT-3G (D1) as blue squares; and a joint analysis of ACT, Planck, and SPT as red diamonds. While the results in this work are slightly higher than ACT at  = 3000 by 1σ, we find excellent agreement with Planck in the overlapping scales and also with the results from SPT-3G and G. Efstathiou & F. McCarthy (2025) over a wide range of scales. For reference, we also show the power spectra from versions of the FLAMINGO simulations as gray curves with different spacings. The curve with the widest spacing corresponds to the simulation with the fiducial cosmology and fiducial active galactic nucleus (AGN) feedback. The next curve (with slightly smaller spacing) shows the same cosmology but with high AGN feedback (fgas − 8σ). This is followed by the low S8 (LS8) cosmology with fiducial feedback and finally the model combining low S8 with high AGN feedback (LS8+fgas − 8σ).

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