Kavli Affiliate: George Efstathiou
| First 5 Authors: George Efstathiou, Fiona McCarthy, , ,
| Summary:
The power spectrum of unresolved thermal Sunyaev-Zeldovich (tSZ) clusters is
extremely sensitive to the amplitude of the matter fluctuations. This paper
present an analysis of the tSZ power spectrum using temperature power spectra
of the cosmic microwave background (CMB) rather than maps of the Compton
y-parameter. Our analysis is robust and insensitive to the cosmic infrared
background. Using data from Planck, and higher resolution CMB data from the
Atacama Cosmology Telescope
and the South Pole Telescope, we find strong evidence that the tSZ spectrum
has a shallower slope and a much lower amplitude at multipoles l >
2000$compared to the predictions of the FLAMINGO hydrodynamic simulations of
the LCDM cosmology.
Recent results on CMB lensing, cross-correlations of CMB lensing with galaxy
surveys and full shape analysis of
galaxies and quasars from the Dark Energy Spectroscopic Instrument suggests
that this discrepancy cannot be resolved by lowering the amplitude of the
matter fluctuations. An alternative possibility is that the impact of baryonic
feedback in the FLAMINGO simulations is underestimated.
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