We constrain the deviation of adiabatic evolution of the universe using the data on the cosmic microwave background (CMB) temperature anisotropies measured by the Planck satellite and a sample of 481 X-ray selected clusters with spectroscopically measured redshifts. To avoid antenna beam effects, we bring all of the maps to the same resolution. We use a CMB template to subtract the cosmological signal while preserving the Thermal Sunyaev–Zeldovich (TSZ) anisotropies; next, we remove galactic foreground emissions around each cluster and we mask out all known point sources. If the CMB blackbody temperature scales with redshift as T(z) = T0(1 +z)1-α, we constrain deviations of adiabatic evolution to be α = −0.007 ± 0.013, consistent with the temperature-redshift relation of the standard cosmological model. This result could suffer from a potential bias δα associated with the CMB template. We quantify it to be |δα| ≼ 0.02 , with the same sign as the measured value of α. Our result is free from those biases associated with using TSZ selected clusters; it represents the best constraint to date of the temperature-redshift relation of the Big Bang model using only CMB data, confirming previous results.

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Published in The Astrophysical Journal, v. 808, no. 2, 128, p. 1-10.

© 2015. The American Astronomical Society. All rights reserved.

The copyright holders have granted the permission for posting the article here.

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This work was done in the context of the FCT/MICINN cooperation grant “Cosmology and Fundamental Physics with the Sunyaev–Zel’dovich Effect” AIC10- D-000443, with additional support from projects FIS2012- 30926 from the Ministerio de Educación y Ciencia, Spain and PTDC/FIS/111725/2009 from FCT, Portugal. C.M. is also supported by a FCT Research Professorship, contract reference IF/00064/2012, funded by FCT/MCTES (Portugal) and POPH/ FSE (EC).