Table 1.
Summary of the CC criteria considered throughout.
| Physical property | Aperture | SCC threshold | WCC threshold | NCC threshold | |
|---|---|---|---|---|---|
| Central cooling time | tcool, 0 | 0.012 r500c | < 1 Gyr | 1 Gyr ≤ tcool, 0 < 7.7 Gyr | ≥7.7 Gyr |
| Central entropy | K0 | 0.012 r500c | ≤22 keV cm2 | 22 < K0/(keV cm2)≤150 | > 150 keV cm2 |
| Central electron density | ne, 0 | 0.012 r500c | > 1.5 × 10−2 cm−3 | 0.015 ≥ ne, 0/cm−3 > 0.005 | ≤0.5 × 10−2 cm−3 |
| Cuspiness | α | 0.04 r500c | > 0.75 | 0.75 ≥ α > 0.5 | ≤0.5 |
| Physical concentration | Cphys | 40 kpc, 400 kpc | > 0.155 | 0.155 ≥ Cphys > 0.075 | ≤0.075 |
| Scaled concentration | Cscaled | 0.15 r500c, r500c | > 0.5 | 0.5 ≥ Cscaled > 0.2 | ≤0.2 |
Notes. Various previous works, both observational and theoretical, have used one or more central thermodynamical properties to separate strong cool-core (SCC), weak cool-core (WCC), and non-cool-core (NCC) clusters. Following Barnes et al. (2018), we considered six different criteria: tcool, 0, K0, ne, 0, α, Cphys, and Cscaled. In addition, the radius (aperture) each was measured in typically varies, as indicated. We note that we adopted these radii and thresholds from previous studies, and they do not necessarily produce an optimal identification of CC versus NCC clusters.
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