Table 2
Summary of the numbers and densities of the molecular ISM and clouds within given locations across the Galactic disc.
| Property | Units | 3 kpc | Nor-Out | Scu-Cen | Sag-Car | Perseus | Spiral arms | Inter-arm |
|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) |
| FlvA method: non-overlapping spiral arm segments | ||||||||
| log(Mfull) | M⊙ | 6.07 | 6.47 | 6.43 | 3.88 | 6.51 | 7.00/6.95 | – |
| length | kpc | 7.67 | 4.04 | 9.27 | 9.28 | 3.05 | 33.32/25.65 | – |
| log(Mfull/length) | M⊙ kpc−1 | 5.19 | 5.87 | 5.46 | 2.92 | 6.02 | 5.48/5.54 | – |
| CxyA method: non-overlapping spiral arm segments | ||||||||
| Ncloud | – | – | 308 | 455 | 32 | 35 | 830 | – |
| log(Mcloud) | M⊙ | – | 6.32 | 6.19 | 3.84 | 5.47 | 6.59 | – |
| length | kpc | – | 4.04 | 9.27 | 9.28 | 3.05 | 33.32 | – |
| Ncloud/length | kpc−1 | – | 75.85 | 48.98 | 3.46 | 11.48 | 25.12 | – |
| log(Mcloud/length) | M⊙ kpc−1 | – | 5.72 | 5.22 | 2.87 | 4.99 | 5.07 | – |
| CxyA method: full spiral arm extent | ||||||||
| Ncloud | – | – | 943 | 1742 | 543 | 263 | 3491 | 2973 |
| log(Mcloud) | M⊙ | – | 6.69 | 6.83 | 6.38 | 6.13 | 7.19 | 7.01 |
| length | kpc | – | 16.92 | 27.23 | 22.13 | 4.01 | 70.29 | – |
| Ncloud/length | kpc−1 | – | 56.23 | 64.57 | 24.55 | 66.07 | 50.12 | – |
| log(Mcloud/length) | M⊙ kpc−1 | – | 5.46 | 5.40 | 5.03 | 5.53 | 5.34 | – |
| length | kpc | – | 16.92 | 27.23 | 22.13 | 4.01 | 70.29 | – |
width (widthIQR) |
pc | – | 463 (666) | 531 (810) | 951 (952) | 682 (885) | 579 (832) | – |
| area | kpc2 | – | 7.84 | 14.48 | 21.06 | 2.74 | 46.12 | 51.35 |
| Ncloud | – | – | 943 | 1742 | 543 | 263 | 3491 | 2973 |
| Ncloud/area | kpc−2 | – | 120.23 | 120.23 | 25.70 | 95.50 | 75.86 | 57.54 |
| log(Mcloud) | M⊙ | – | 6.69 | 6.83 | 6.38 | 6.13 | 7.19 | 7.01 |
| log(Mcloud/area) | M⊙ kpc−2 | – | 5.80 | 5.67 | 5.05 | 5.70 | 5.53 | 5.30 |
Notes. From left to right. Column (1): considered property: mass of the molecular ISM calculated from the lv-map (Mfull), length of the spiral arm or spiral arm segment across the SEDIGISM field (length), mass of the molecular ISM per unit length (of a spiral arm segment, Mfull/length), number of clouds (Ncloud), mass in clouds Mcloud, number of clouds per unit length (of a spiral arm/spiral arm segment, Ncloud/length), mass in clouds per unit length (of a spiral arm/spiral arm segment, Mcloud/length), medians (width
) and inter-quartile ranges (widthIQR) of two times the absolute offset with respect to the spiral-arm ridge line, length of the spiral arms multiplied by the median width (area), cloud number surface density (Ncloud/area), and cloud mass surface density (Mcloud/area). Column (2): considered property units. Columns (3)–(7): spiral arm or spiral arm segment name. Column (8): entire spiral-arm region, the symbol ‘/’ separates quantities calculated with the 3 kpc arms contribution included and excluded, respectively. Column (9): entire inter-arm region. Quantities are calculated following the FlvA method (Sect. 4.1) and CxyA method (Sect. 4.2) considering the non-overlapping segment on the lv-map (see Fig. 1), and for the CxyA method also the extent of the full arm.
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