Table 5.
Surface density of star formation and of cold molecular gas for different assumptions of SFR and radial sizes of the SF (rSF) and molecular gas (rH2) distributions.
| Case | rH2 | rSF | log( ) |
SFR | log(ΣMH2) | log(ΣSFR) | Symbol |
|---|---|---|---|---|---|---|---|
| (kpc) | (kpc) | (M⊙) | (M⊙ yr−1) | (M⊙ pc−2) | (M⊙ yr−1 kpc−2) | ||
| (A) rH2 = rSF = rCO, αCO = 0.78 | |||||||
| A1 | 0.358 | 0.358 | 9.36 | 141 | 3.76 | 2.54 | Green triangle |
| A2 | 0.358 | 0.358 | 9.36 | 63 | 3.76 | 2.19 | Red triangle |
| A3 | 0.358 | 0.358 | 9.36 | 24 | 3.76 | 1.76 | Black triangle |
| (B) rH2 = rSF = rdisk, αCO = 0.78 | |||||||
| B1 | 2.0 | 2.0 | 10.00 | 141 | 2.90 | 1.05 | Green circle |
| B2 | 2.0 | 2.0 | 10.00 | 63 | 2.90 | 0.70 | Red circle |
| B3 | 2.0 | 2.0 | 10.00 | 24 | 2.90 | 0.28 | Black circle |
| (C) rH2 = rSF = 4.2 kpc, αCO = 4.3 | |||||||
| C | 4.2 | 4.2 | 10.73 | 24 | 3.03 | −0.36 | Black diamond |
Notes. For the purpose of comparison with Lanz et al. (2016), we have assumed the area corresponding to each radial size, r, as A = πr2. 
is the assumed cold molecular gas mass enclosed within rH2. SFR in units of M⊙ yr−1. ΣMH2 in M⊙ pc−2. rCO = 358 pc is the CO(2–1) half light radius inferred with ALMA data (see text). rdisk = 2 kpc is the radius of the molecular disk discovered by Fotopoulou et al. (2019). Case C corresponds to Lanz et al. (2016). All molecular masses were calculated with αCO = 0.78, except in case C, for which αCO = 4.3 as in Lanz et al. (2016). The last column specifies the symbol used in Fig. 13.
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