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Planck satellite cluster cosmology via the Sunyaev-Zeldovich effect


  • Dr. Juan Francisco MACIAS-PEREZ

Auteurs principaux


Clusters of galaxies are unique cosmological probes sensitive to the primordial density fluctuations, and the expansion history and energy content of the Universe. The thermal Sunyaev-Zeldovich (tSZ) effect is an observable of choice for cluster cosmology due to the low scatter in the relationship between SZ flux and cluster mass, and the construction of large tSZ selected cluster catalogs. The Planck satellite because of its spectral coverage (30-857 GHz) and its 9 channels is well adapted to the detection of the Sunyaev-Zeldovich effect in clusters of galaxies. The Planck data have been used to produce both a catalogue of 1653 clusters of galaxies and a full sky map of the Compton parameter. We present here Planck cluster cosmological results obtained from: 1) the number counts of tSZ Planck cluster catalogue, and 2) the angular power spectrum and high order statistics of the Planck Compton parameter map.The constraints obtained on the universe matter density and matter fluctuations are consistent between the two analyses and with other LSS probes. However, there exists a weak tension between Planckcluster and CMB cosmological constraints. This discrepancy, which may due to bias in the observable-mass relation or unkonwn systematics, will be discussed in details.