For refcode 2009ApJ...705.1122L: Retrieve 13 NED objects in this reference. Please click here for ADS abstract
NED Abstract
Copyright by American Astronomical Society.
Reproduced by permission
2009ApJ...705.1122L
Redshift Dependence of the Cosmic Microwave Background Temperature from
SunyaevZeldovich Measurements
Luzzi, G.; Shimon, M.; Lamagna, L.; Rephaeli, Y.; De Petris, M.; Conte, A.;
De Gregori, S.; Battistelli, E. S.
Abstract. We have determined the cosmic microwave background temperature,
T(z), at redshifts in the range 0.0230.546, from multifrequency
measurements of the SunyaevZeldovich (SZ) effect toward 13 clusters. We
extract the parameter {alpha} in the redshift scaling T(z) = T_0_
(1+z)^1{alpha}^, which contrasts the prediction of the standard model
({alpha} = 0) with that in nonadiabatic evolution conjectured in some
alternative cosmological models. The statistical analysis is based on two
main approaches: using ratios of the SZ intensity change, {DELTA}I, thus
taking advantage of the weak dependence of the ratios on intracluster gas
properties, and using directly the {DELTA}I 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 waysby
direct integrations and by a Monte Carlo Markov chain approach. Employing
these different methods we obtain two sets of results that are consistent
with {alpha} = 0, in agreement with the prediction of the standard model.
Key words: cosmic microwave background, cosmology: observations, galaxies:
ZW3146 RXJ1347 CL0016+16 MS0451  0305
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