Table 3.
Molecular gas properties of the BCGs.
| Galaxy | zspec | Excitation ratio | MH2 | τdep |
 |
 |
τdep, MS |
 |
|---|---|---|---|---|---|---|---|---|
| (1010 M⊙) | (Gyr) | (Gyr) | ||||||
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) |
| KiDS 0920 | 0.3216 | r31 < 0.13 | 4.8 ± 0.9 |
 |
 |
 |
 |
 |
| KiDS 1220 | 0.3886 | r21 = 0.34 ± 0.07 | 14.0 ± 1.4 |
 |
 |
 |
 |
 |
| r31 = 0.15 ± 0.03 | ||||||||
| KiDS 1444 | 0.4417 | r21 = 0.68 ± 0.13 | 13.5 ± 1.7 |
 |
 |
 |
 |
 |
| r31 = 0.32 ± 0.11 | ||||||||
Notes. Column description: (1) BCG name; (2) Spectroscopic redshift as in Table 1; (3) Excitation ratio; (4) Molecular gas mass 
, where αCO = 4.36 M⊙ (K km s−1 pc2)−1 is assumed; (5) Depletion timescale τdep = MH2/SFR; (6) Molecular gas-to-stellar mass ratio; (7) Molecular gas-to-dust mass ratio; (8–9) Depletion timescale and molecular gas-to-stellar mass ratio predicted for MS field galaxies with redshift and stellar mass of our targets, following the prescription by Tacconi et al. (2018), calibrated to αCO = 4.36 M⊙ (K km s−1 pc2)−1. For KiDS 0920 the reported r31 upper limit is at 3σ.
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