Resumen
The CMB Planck satellite (ESA) will provide a catalogue of ∼ 30 000 galaxy clusters (the Sunyaev-Zel'dovich effect) between redshift 0 and ≈ 2-3 (depending on the cosmological model). This huge catalogue of clusters will permit detailed studies of the evolution of the cluster population with redshifts that will constrain the cosmological model. The identification of the high redshift clusters should be done with a large telescope (such as GTC) since Planck data alone will not provide any clue about the redshift of the clusters. In this article, we show that an optical follow-up of only ≈ 300 clusters (randomly selected from the Planck catalogue) is needed in order to distingish models with or without a cosmological constant.
