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. © 2009. The American Astronomical Society. All rights reserved.

Redshift dependence of the cosmic microwave background temperature from sunyaev-zeldovich measurements / Luzzi, Gemma; M., Shimon; Lamagna, Luca; Y., Rephaeli; DE PETRIS, Marco; Conte, Andrea; DE GREGORI, Simone; Battistelli, Elia Stefano. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - 705:2(2009), pp. 1122-1128. [10.1088/0004-637x/705/2/1122]

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

LUZZI, GEMMA;LAMAGNA, Luca;DE PETRIS, Marco;CONTE, ANDREA;DE GREGORI, Simone;BATTISTELLI, Elia Stefano
2009

Abstract

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. © 2009. The American Astronomical Society. All rights reserved.
2009
cosmic microwave background; cosmology: observations; galaxies: clusters: individual (a1656; a2204; a1689; a520; a2163; a773; a2390; a1835; a697; zw3146; rxj1347; cl0016+16; ms0451?0305)
01 Pubblicazione su rivista::01a Articolo in rivista
Redshift dependence of the cosmic microwave background temperature from sunyaev-zeldovich measurements / Luzzi, Gemma; M., Shimon; Lamagna, Luca; Y., Rephaeli; DE PETRIS, Marco; Conte, Andrea; DE GREGORI, Simone; Battistelli, Elia Stefano. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - 705:2(2009), pp. 1122-1128. [10.1088/0004-637x/705/2/1122]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/358267
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