AGN feedback in the Planck selected Clusters: a detailed study of X-ray cavities

We present a statistical study of X-ray cavities in 77 CC and 112 NCC Planck selected clusters using Chandra observations to further insight into how AGN feedback operates on clusters. The Planck cluster sample is an all-sky mass-selected, nearly unbiased sample of galaxy clusters at moderate redshift (z<0.5), which could reflect the entire AGN feedback cycle at the centers of galaxy clusters. We find that the AGN heating traced by the power of the X-ray cavities alone is able to balance the radiative losses of the ICM in our sample. Our observations show a hint on how the dynamical state of the clusters could affect the asymmetries of the cavities. We also found that clusters with cavities also display Halpha emission, indicating the important role of AGN feedback on the condensation of gas in CC clusters. However, a few Halpha emitting systems lack X-ray cavities, suggesting either different heating mechanisms or different timescales for the dissipation of the X-ray cavities and the cold gas.