Volume 570, October 2014
|Number of page(s)||4|
|Published online||21 October 2014|
The important role of evolution in the Planck YSZ-mass calibration
INAF-Osservatorio Astronomico di Brera, via Brera 28,
Accepted: 29 September 2014
In light of the tension between cosmological parameters from Planck cosmic microwave background and galaxy clusters, we revised the Planck analysis of the YSZ-mass calibration to allow evolution to be determined by the data instead of being imposed as an external constraint. Our analysis uses the very same data and Malmquist bias corrections as used by the Planck team in order to emphasize that differences in the results come from differences in the assumptions. The evolution derived from 71 calibrating clusters, with 0.05 < z < 0.45, is proportional to E2.5 ± 0.4(z), so inconsistent with the self-similar evolution (E2/3) assumed by previous analyses. When allowing for evolution, the slope of YSZ-mass relation turns out to be 1.51 ± 0.07, which is shallower by 4.8σ than the value derived when assuming self-similar evolution, introducing a mass-dependent bias. The non-self-similar evolution of YSZ has to be accounted for in analyses aimed to establish the biases of Planck masses.
Key words: galaxies: clusters: general / methods: statistical / cosmology: observations / galaxies: clusters: intracluster medium
© ESO, 2014
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