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Table 1

Properties of the GMCs investigated in this paper.

# Region Mass (Dust / CO) [105 M] Distance [pc] l [o] b [o] M/d2 [(105M/ kpc2)] Angular size [arcdeg2]

1 ρ Oph 0.12 / 0.08 165 356° 18° 8.4 68
2 Orion B 0.78 / 0.65 500 205° −14° 3.9 22
3 Orion A 1.2 / 0.80 500 213° −18° 5.2 28
4 Mon R2 1.1 / 0.80 830 214° −12° 1.7 19
5 Taurus 0.30 / 0.23 140 170° −16° 15.0 101
6 R CrA 0.01 / 0.01 150 0.5° −18° 0.8 8
7 Chamaeleon 0.11 / 0.09 215 300° −16° 2.4 22
8 Perseus OB2 0.41 / 0.3 350 158° −20° 3.3 27

Notes. The numbers in first column are used to identify the clouds (see Table 2). The estimated distance and position are obtained from Dame et al. (1987). The mass values (dust and CO) listed in the third column are calculated from Planck data and the CfA maps respectively (see text for a description of the mass derivation).

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