Table 2.
Gas properties of the two SBs and two MSs.
| SB1 | SB2 | MS1 | MS2 | |
|---|---|---|---|---|
| (a)αCO(Z) (M⊙/(K km s−1 pc2)) | 4.09 | 4.10 | 4.06 | 4.06 |
| (b)Mgas, CO (1010 M⊙) | 20.2 ± 1.7 | 13.3 ± 1.4 | 9.2 ± 0.9 | 7.4 ± 1.1 |
| (c)fgas, CO | 0.70 |
0.66 |
0.29 |
0.25 |
| (d)tdep, CO (Gyr) | 0.15 ± 0.02 | 0.18 ± 0.08 | 0.32 ± 0.14 | 0.25 ± 0.15 |
| (e)δGDR | 126 ± 16 | 123 ± 28 | 110 ± 65 | 171 ± 47 |
| (f)Mgas, GDR (1010 M⊙) | 17.9 ± 6.4 | 12.8 ± 5.1 | 7.6 ± 5.1 | 4.0 ± 1.7 |
| fgas, GDR | 0.68 |
0.65 |
0.25 |
0.15 |
| tdep, GDR (Gyr) | 0.14 ± 0.05 | 0.17 ± 0.10 | 0.26 ± 0.21 | 0.13 ± 0.10 |
| (g)Mgas, 3.2mm (1010 M⊙) | 22.7 ± 6.4 | 10.4 ± 3.9 | 17.1 ± 5.5 | 5.1 ± 1.6 |
| fgas, 3.2mm | 0.73 |
0.61 |
0.43 |
0.18 |
| tdep, 3.2mm (Gyr) | 0.17 ± 0.05 | 0.14 ± 0.08 | 0.59 ± 0.32 | 0.17 ± 0.11 |
Notes. The molecular gas masses are estimated based on the CO(1−0) emission line using metallicity-dependent conversion factors, gas-to-dust ratio, and 3.2mm dust continuum emission.
CO-to-H2 conversion factor (αCO(Z)) from W18, calculated based on the mass-metallicity relation.
Gas depletion time: tdep = Mgas/SFR, which is the inverse of the star formation efficiency (SFE =1/tdep).
Gas-to-dust mass ratio, computed based on the δGDR − Z relation (Eq. (2)).
Mgas, GDR, computed based on the gas-to-dust ratio (Eq. (1)).
Mgas, 3.2mm, computed based on the Rayleigh-Jeans tail dust continuum (Eq. (4)).
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