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Table 5

Statistics for each morphological type (in percentages).

Type PAH or Bub. Trigg. Edge IRDCa H ii UCH ii Complex
(1) (2) (3) (4) (5) (6) (7) (8)

EC1 59 (8) 0 (0.8) 3 (1.5) 52 (13) 62 (9) 18 (4) 52 (8)
EC2 87 (9) 8.2 (2.1) 0 (0.5) 11 (5) 69 (8) 5.6 (1.7) 63 (7)
OC0 50 (12) 12 (5) 0 (1.8) 0 (5.9) 55 (12) 0 (1.8) 52 (12)
OC1 50 (18) 9.1 (6.7) 0 (4.5) 0 (16.7) 59 (21) 0 (4.5) 45 (17)
OC2 1.4 (0.7) 0 (0.3) 0 (0.3) 0 (0.7) 0.7 (0.5) 0 (0.3) 1 (0.6)

Notes. Within each morphological type, the given number is the percentage in the whole sample of clusters associated with PAH emission or IR bubbles (Col. 2), clusters with signposts of triggered star formation on the surroundings (Col. 3), clusters located at the edge of an IR bubble (Col. 4), clusters associated with IRDCs (Col. 5), clusters associated with H ii regions including ultra compact ones (Col. 6), clusters associated with ultra compact H ii regions alone (Col. 7), and finally clusters that are part of a complex of several clusters (Col. 8). Numbers between parentheses are the corresponding Poisson uncertainties, with a minimum error of ±1 clusters for null values.

(a)

Percentages are from the representative sample (clusters with D ≤ 3 kpc).

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