Table 9.
Integrated ISM properties in the disc, spiral arms, and centre of M 99.
| Quantity | Value | Units | ||
|---|---|---|---|---|
| Disc | 30 | |||
| Σ★ | Arms | 150 | M⊙ pc−2 | |
| Centre | 1400 | |||
| Disc | 0.002 | |||
| ΣSFR | Arms | 0.013 | M⊙ yr−1 kpc−2 | |
| Centre | 0.08 | |||
| Disc | 5 | |||
| Σmol | Arms | 30 | M⊙ pc−2 | |
| Centre | 170 | |||
| Disc | 76 ± 6 | |||
| Σdust | Arms | 114 ± 6 | × 10−3 M⊙ pc−2 | |
| Centre | 360 ± 20 | |||
| Disc | 3 | |||
| τdepl | Arms | 2 | Gyr | |
| Centre | 2 | |||
| Disc | 0.07 | |||
| sSFR | Arms | 0.09 | Gyr−1 | |
| Centre | 0.06 | |||
Notes. From top to bottom, in the rows we list the stellar mass surface density, Σ★; the SFR density, ΣSFR; the molecular gas surface density, Σmol; the dust mass surface density, Σdust; the depletion timescale, τdepl; and the specific SFR, sSFR. When not given, the uncertainty is dominated by calibration uncertainty, reported in Appendix B. The values for Σmol and τdepl were obtained assuming that the CO(1–0) emission outside the EMPIRE masks is zero (see Fig. B.4).
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