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Constraints on the CMB Temperature Evolution using Multi-Band Measurements of the Sunyaev Zel'dovich Effect with the South Pole Telescope

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arxiv 1312.2462 v1 pith:AWQEG5NC submitted 2013-12-09 astro-ph.CO

Constraints on the CMB Temperature Evolution using Multi-Band Measurements of the Sunyaev Zel'dovich Effect with the South Pole Telescope

A. Saro , J. Liu , J. J. Mohr , K. A. Aird , M. L. N. Ashby , M. Bayliss , B. A. Benson , L. E. Bleem
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S. Bocquet M. Brodwin J. E. Carlstrom C. L. Chang I. Chiu H. M. Cho A. Clocchiatti T. M. Crawford A. T. Crites T. de Haan S. Desai J. P. Dietrich M. A. Dobbs K. Dolag J. P. Dudley R. J. Foley D. Gangkofner E. M. George M. D. Gladders A. H. Gonzalez N. W. Halverson C. Hennig W. L. Holzapfel J. D. Hrubes C. Jones R. Keisler A. T. Lee E. M. Leitch M. Lueker D. Luong-Van A. Mantz D. P. Marrone M. McDonald J. J. McMahon J. Mehl S. S. Meyer L. Mocanu T. E. Montroy S. S. Murray D. Nurgaliev S. Padin A. Patej C. Pryke C. L. Reichardt A. Rest J. Ruel J. E. Ruhl B. R. Saliwanchik J. T. Sayre K. K. Schaffer E. Shirokoff H. G. Spieler B. Stalder Z. Staniszewski A. A. Stark K. Story A. van Engelen K. Vanderlinde J. D. Vieira A. Vikhlinin R. Williamson O. Zahn A. Zenteno
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keywords alphatemperaturedovichevolutionsunyaevadiabaticclustersconstrain
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The adiabatic evolution of the temperature of the cosmic microwave background (CMB) is a key prediction of standard cosmology. We study deviations from the expected adiabatic evolution of the CMB temperature of the form $T(z) =T_0(1+z)^{1-\alpha}$ using measurements of the spectrum of the Sunyaev Zel'dovich Effect with the South Pole Telescope (SPT). We present a method for using the ratio of the Sunyaev Zel'dovich signal measured at 95 and 150 GHz in the SPT data to constrain the temperature of the CMB. We demonstrate that this approach provides unbiased results using mock observations of clusters from a new set of hydrodynamical simulations. We apply this method to a sample of 158 SPT-selected clusters, spanning the redshift range $0.05 < z < 1.35$, and measure $\alpha = 0.017^{+0.030}_{-0.028}$, consistent with the standard model prediction of $\alpha=0$. In combination with other published results, we constrain $\alpha = 0.011 \pm 0.016$, an improvement of $\sim 20\%$ over published constraints. This measurement also provides a strong constraint on the effective equation of state in models of decaying dark energy $w_\mathrm{eff} = -0.987^{+0.016}_{-0.017}$.

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  1. Cosmic microwave background temperature cosmography

    astro-ph.CO 2026-07 accept novelty 6.0

    Violations of the CMB temperature-redshift law are constrained to percent level by cosmography on SZ and spectroscopic data, with one non-standard parameter sufficient and no advantage from Padé or y-expansions.