G. Luzzi

Redshift dependence of the cosmic microwave background temperature from sunyaev-zeldovich measurements

We have determined the cosmic microwave background temperature, T(z), at redshifts in the range 0.023-0.546, from multi-frequency measurements of the Sunyaev-Zeldovich (S-Z) effect toward 13 clusters. We extract the parameter α in the redshift scaling T(z) = T 0(1 + z)1–α, which contrasts the prediction of the standard model (α = 0) with that in non-adiabatic evolution conjectured in some alternative cosmological models. The statistical analysis is based on two main approaches: using ratios of the S-Z intensity change, ΔI, thus taking advantage of the weak dependence of the ratios on intracluster gas properties, and using directly the ΔI measurements. In the former method, dependence on the Thomson optical depth and gas temperature is only second order in these quantities. In the second method, we marginalize over these quantities which appear to first order in the intensity change. The marginalization itself is done in two ways—by direct integrations and by a Monte Carlo Markov chain approach. Employing these different methods we obtain two sets of results that are consistent with α = 0, in agreement with the prediction of the standard model.We have determined the CMB temperature,

Millimeter observation of the SZ effect in the corona borealis supercluster

T(z)

SAGACE : The spectroscopic active galaxies and clusters explorer

, at redshifts in the range 0.023-0.546, from multi-frequency measurements of the S-Z effect towards 13 clusters. We extract the parameter

Absolute calibration and beam reconstruction of MITO (a ground-based instrument in the millimetric region)

\alpha

MAD-4-MITO, a multi array of detectors for ground-based mm/submm SZ observations

in the redshift scaling

Spectroscopic active galaxies and clusters explorer

T(z)=T_{0}(1+z)^{1-\alpha}

New data for the X, y, z, TCMB reference frame

, which contrasts the prediction of the standard model (

Triple experiment spectrum of the Sunyaev-Zel'dovich effect in the Coma Cluster: H0

\alpha=0

Constraining the evolution of the CMB temperature with SZ measurements from Planck data

) with that in non-adiabatic evolution conjectured in some alternative cosmological models. The statistical analysis is based on two main approaches: using ratios of the S-Z intensity change,

The Sunyaev-Zeldovich effect in superclusters of galaxies using gasdynamical simulations: The case of Corona Borealis

\Delta I