S. De Gregori

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,

The Large-Scale Polarization Explorer (LSPE)

T(z)

SWIPE: a bolometric polarimeter for the Large-Scale Polarization 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

X‐ray calibration of Sunyaev–Zel’dovich scaling relations with the ACCEPT catalogue of galaxy clusters observed by Chandra

\alpha

X-ray calibration of SZ scaling relations with the ACCEPT catalogue of galaxy clusters observed by Chandra

in the redshift scaling

Millimeter observation of the SZ effect in the corona borealis supercluster

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

Millimetre and submillimetre atmospheric performance at Dome C combining radiosoundings and atm synthetic spectra

, which contrasts the prediction of the standard model (

A far infrared polarimeter

\alpha=0

Atmospheric monitoring in the millimetre and submillimetre bands for cosmological observations: CASPER2

) 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,

Biased total mass of cool core galaxy clusters by Sunyaev-Zel'dovich effect measurements

\Delta I