ICM cooling rate Ṁ_cool vs. bolometric radio luminosity of lobes between 10 MHz and 10 GHz. The red data point indicates the Phoenix cluster, and the black data points indicate the sample of Bîrzan et al. (2008). The dashed line shows the best power-law fit through the data and is given by log L_radio[10⁴²erg s⁻¹] = (1.41 ± 0.35) log Ṁ_cool[M_⊙/yr] − (1.95 ± 0.53). Phoenix cluster data are from McDonald et al. (2019) and this work, and data for the other clusters are from Bîrzan et al. (2008), McDonald et al. (2019).