Volume 561, January 2014
|Number of page(s)||12|
|Section||Cosmology (including clusters of galaxies)|
|Published online||27 January 2014|
Measurement of the TCMB evolution from the Sunyaev-Zel’dovich effect
Institut d’Astrophysique Spatiale, CNRS (UMR8617) Université Paris-Sud
11, Bâtiment 121,
2 CNRS, IRAP, 9 Av. colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France
3 Université de Toulouse, UPS-OMP, IRAP, 31400 Toulouse, France
Accepted: 27 November 2013
In the standard hot cosmological model, the black-body temperature of the cosmic microwave background (CMB), TCMB, increases linearly with redshift. Across the line of sight CMB photons interact with the hot (~ 107−8 K ) and diffuse gas of electrons from galaxy clusters. This interaction leads to the well-known thermal Sunyaev-Zel’dovich effect (tSZ), which produces a distortion of the black-body emission law, depending on TCMB. Using tSZ data from the Planck satellite, it is possible to constrain TCMB below z = 1. Focusing on the redshift dependance of TCMB, we obtain TCMB(z) = (2.726 ± 0.001) × (1 + z)1−β K with β = 0.009 ± 0.017, which improves on previous constraints. Combined with measurements of molecular species absorptions, we derive β = 0.006 ± 0.013. These constraints are consistent with the standard (i.e. adiabatic, β = 0) Big-Bang model.
Key words: cosmology: observations / cosmic background radiation / galaxies: clusters: general
© ESO, 2014
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.