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We want to characterize the dynamical state of galaxy clusters detected withthe Sunyaev-Zeldovich (SZ) effect by Planck and compare them with the dynamicalstate of clusters selected in X-rays survey. We analyzed a representativesubsample of the Planck SZ catalogue, containing the 132 clusters with thehighest signal to noise ratio and characterize their dynamical state using asindicator the projected offset between the peak of the X-ray emission and theposition of the Brightest cluster galaxy. We study the distribution of ourindicator in our sample and compare it to its distribution in X-ray selectedsamples (HIFLUGCS, MACS and REXCESS). The distributions are significantlydifferent and the fraction of relaxed objects is smaller in the Planck sample($52 \pm 4 \%$) than in X-ray samples ($\simeq 74\%$) We interpret this resultas an indication of different selection effects affecting X-rays (e.g. "coolcore bias") and SZ surveys of galaxy clusters.

Measuring the dynamical state of Planck SZ-selected clusters: X-ray peak - BCG offset