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Centro de Astrofísica da Universidade do Porto

Constraining the Redshift Evolution of the Cosmic Microwave Background Blackbody Temperature with PLANCK Data

I. de Martino, R. T. Génova-Santos, F. Atrio-Barandela, H. Ebeling, A. Kashlinsky, D. Kocevski, C. J. A. P. Martins

Abstract
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 $T{(z)={T}_{0}(1+z)}^{1-alpha }$, 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 $| delta alpha | leqslant 0.02$, 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.

Keywords
cosmic background radiation, cosmology: observations, cosmology: theory

The Astrophysical Journal
Volume 808, Page 128
August 2015

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