088362

We propose a 42 ks observation of the galaxy group Nest 200047. LOFAR images with unprecedented sensitivity at low radio frequencies revealed a surprisingly complex filamentary structure related to the AGN feedback in this system comma extending more than 200 kpc in radius. We interpret this unique morphology as being due to an old AGN bubble that is in the process of breaking up as it is buoyantly rising out of the group and interacting with the surrounding medium. To our knowledge comma this is the most advanced stage of bubble evolution observed to date. The proposed exposure will allow us to quantify the morphology of the X-ray cavities associated with the large-scale radio lobes and perform a detailed analysis of the substructure and thermodynamical properties of this spectacular system.