Table 1.
Summary of key characteristics of the six archetypal cluster histories across the TNG-Cluster population.
| Type of history | # halos | # transformations | zform | log(M500c/1014 M⊙) | K0 [keV cm2] | # mergers |
|---|---|---|---|---|---|---|
| No changes | 35 (10%) | 0 | 0.90 (0.85) | 3.95 (3.35) | 56 (47) | 8.2 (6) |
| only K0↗ | 226 (64%) | 1.6 (1) | 0.94 (0.89) | 5.28 (4.35) | 159 (129) | 11.9 (11) |
| only K0↘ | 13 (4%) | 1.2 (1) | 1.03 (1.04) | 3.29 (2.71) | 20 (15) | 6.4 (6) |
| K0↘↗ | 14 (4%) | 2 | 1.43 (1.36) | 6.49 (5.89) | 87 (31) | 12.2 (12) |
| K0↗↘ | 28 (8%) | 2 | 1.12 (1.41) | 4.82 (3.98) | 44 (26) | 11.4 (11) |
| Irregular | 36 (10%) | 3.4 (3) | 1.26 (1.18) | 6.31 (5.93) | 123 (81) | 13.8 (13) |
Notes. For each archetypal cluster history we list: the number of halos of that class and then the averages across the clusters in each category of: number of transformations experienced by each cluster, formation redshift, halo mass at z = 0, central entropy at z = 0, and number of all mergers experienced by each cluster. We give the mean, and in parentheses the median, of each category. In descending order, the six archetypes are clusters with (i) no transformations, (ii) only transformations to higher core entropy, (iii) only transformations to lower core entropy, (iv) transformations to lower, then to higher core entropy (v) transformations to higher, then to lower core entropy, and (vi) clusters with three or more transformations that do not fit into the other classes.
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