Radio relics in LoTSS-DR2 and PSZ2

In particular, we developed a method to describe the characteristic downstream width in a statistical manner. Additionally, we searched for differences between radio relic-hosting clusters with and without radio halos. We find that, in our sample, ~10% of galaxy clusters host at least one radio relic.

We confirm previous findings, at higher frequencies, of a correlation between the relic-cluster centre distance and the longest linear size, as well as the radio relic power and cluster mass. However, our findings suggest that we are still missing a population of low-power relics. We also find that relics are wider than theoretically expected, even with optimistic downstream conditions.

Finally, we do not find evidence of a single property that separates relic-hosting clusters with and without radio halos.