Abstract

We have deduced the cosmic microwave background temperature in the Coma Cluster (A1656, z = 0.0231) and in A2163 (z = 0.203) from spectral measurements of the Sunyaev-Zeldovich (SZ) effect over four passbands at radio and microwave frequencies. The resulting temperatures at these redshifts are T Coma = 2.789 -0.065 +0.080 K and T A2163 = 3.377 -0.102 +0.101 K, respectively. These values confirm the expected relation T(z) - T 0(1 + z), where T 0 = 2.725 ± 0.002 K is the value measured by the COBE Far Infrared Absolute Spectrometer experiment. Alternative scaling relations that are conjectured in nonstandard cosmologies can be constrained by the data; for example, if T(z) = T 0(1 + z) 1-a or T(z) = T 0[1 + (1 + d)z], then a = -0.16 -0.32 +0.34 and d = 0.17 ± 0.36 (at 95% confidence). We briefly discuss future prospects for more precise SZ measurements of T(z) at higher redshifts.

Keywords

Cosmic microwave backgroundPhysicsAstrophysicsRedshiftComa ClusterMicrowaveGalaxyGalaxy clusterScalingCluster (spacecraft)SpectrometerOpticsQuantum mechanics

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Publication Info

Year
2002
Type
article
Volume
580
Issue
2
Pages
L101-L104
Citations
64
Access
Closed

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E. S. Battistelli, M. De Petris, L. Lamagna et al. (2002). Cosmic Microwave Background Temperature at Galaxy Clusters. The Astrophysical Journal , 580 (2) , L101-L104. https://doi.org/10.1086/345589

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DOI
10.1086/345589