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Discussion

Like Perseus A and Hydra A, A4059 shows clear signs of interaction between the radio galaxy and the ICM. However, unlike in these systems, there is no one-to-one correspondence between the radio lobes and the X-ray holes. We argue below that the cavities were indeed created by the radio activity (given the similarity in position angle and the fact that there are no other viable models for producing large ICM cavities), but that the radio galaxy has faded since they were formed. This is particularly interesting since CXO has recently found clusters with cavities but without a radio source (e.g., McNamara et al., 2001): A4059 could be a `missing link' between cavities with and without detectable radio lobes, supporting the notion that cluster cavities can be created by radio galaxies without having to show current radio activity.



Subsections

Chris Reynolds 2003-01-23