Speaker
Description
Over the past few decades, it has become clear that brightest cluster galaxies (BCG) of galaxy groups and clusters maintain the thermal balance of their surrounding halos through radio jet activity. Yet key questions remain: how frequently their black holes are triggered, how jet orientations evolve over time, and through which physical channels (bubbles, shocks, turbulence) feedback operates. These uncertainties persist partly because the relevant spatial scales span from a few parsecs to tens of kiloparsecs. Probing this range in the radio band has so far required long observations with multiple facilities, restricting detailed studies to only a handful of objects. Even so, these few cases have revealed the complexity of feedback and jet behavior in cluster radio galaxies. I will focus on this complexity by presenting our recent investigations into different topics of AGN feedback in clusters: linking the parsec and the kpc scales with sensitive radio observations; tracing pc-scale jet reorientation using high-resolution VLBI techniques; and identifying the oldest feedback episodes as fossil radio remnants extending hundreds of kpc. These studies - carried out by combining data from a wide range of radio observatories, including the JVLA, LOFAR (with international stations), MeerKAT, e-MERLIN, VLBA, and EVN - highlight the need for high-resolution imaging that also recovers diffuse, large-scale emission. The SKA telescope will enable such studies in larger samples of BCGs, which is required to connect the time evolution of jets in radio galaxies with the thermal structure of their surrounding atmospheres.
| Topics | Galaxy Clusters & LSS (relativistic particles and magnetic fields) |
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