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Table 1:

Properties of clusters and associations more massive than 103 $M_{\odot }$ in the Galaxy.
Identification Distance Age log ($M_{\rm c}$) size log ( $\rho_{\rm c}$)
  [pc] [Myr] [$M_{\odot }$] [pc] [$M_{\odot }$ pc-3]
Arches1 $\rm 8^{+1}_{-1}$ 2-2.5 4.3 $\rm0.19^{+0.03}_{-0.03}$ $\rm 5.6^{+1}_{-1}$
NGC 36031 $\rm 7.6^{+1}_{-1}$ 2-2.5 4.1 $\rm0.3^{+0.04}_{-0.04}$ $\rm 5.0^{+0.1}_{-0.1}$
Trumpler 141 $\rm 2.8^{+0.6}_{-0.2}$ <2 4.0 $\rm0.5^{+0.1}_{-0.04}$ $\rm 4.3^{+0.05}_{-0.3}$
Westerlund 11 $\rm 3.55^{+0.17}_{-0.01}$ 4-6 4.7 $\rm 1.0^{+0.05}$ $\rm 4.1^{+0.06}_{-0.03}$
Westerlund 21 2.8 1.5-2.5 4.0 0.8 3.7
RSGC 11 $\rm 5.83^{+1.9}_{-0.78}$ 10-14 4.5 $\rm 1.3^{+0.04}_{-0.04}$ $\rm 3.5^{+0.1}_{-0.3}$
Quintuplet1 $\rm 8^{+1}_{-1}$ 4-6 4.3 $\rm 1.0^{+0.13}$ $\rm 3.7^{+0.7}_{-0.2}$
DBS20032 $\rm 7.9^{+1.2}_{-1}$ 2-5 3.8 $\rm 1.2^{+0.18}_{-0.5}$ $\rm 3.05^{+0.5}_{-0.3}$
RSGC 21 $\rm 5.83^{+1.91}_{-0.78}$ 14-21 4.6 $\rm 2.7^{+0.77}_{-0.77}$ $\rm 2.7^{+0.05}_{-0.03}$
$\chi$ Per3 $\rm 2.34^{+0.1}_{-0.5}$ 12.8 4.1 $\rm 2.5^{+0.1}_{-0.7}$ $\rm 2.61^{+0.5}_{-0.05}$
h Per3 $\rm 2.34^{+0.1}_{-0.5}$ 12.8 4.2 $\rm 2.1^{+0.1}_{-0.7}$ $\rm 2.25^{+0.5}_{-0.05}$
CYg OB23 $\rm 1.74^{+0.2}_{-0.5}$ 1-4 4.4 $\rm 5.2^{+0.06}_{-2.5}$ $\rm 1.61^{+0.02}_{0.4}$
NGC 66113 $\rm 1.995^{+0.01}_{-0.25}$ 1-5 4.4 $\rm 5.9^{+0.1}_{-0.8}$ $\rm 1.45^{+0.22}_{0.11}$
NGC 22443 1.88-0.4 1-3 3.9 5.6 -1.2 $\rm 1.03^{+0.33}$
IC 18053 $\rm 2.34^{+0.1}_{-0.1}$ 1-3 4.2 $\rm 7.1^{+0.3}_{-0.3}$ $\rm0.98^{+0.03}$
Ori Ib3 $\rm0.363^{+0.2}_{-0.2}$ 1.7 3.6 $\rm 6.3^{+0.3}_{-0.3}$ $\rm0.55^{+0.11}_{-0.02}$
NGC 73803 3.73 2 3.8 6.5 0.72
Ori Ic3 $\rm0.398^{+0.2}_{-0.2}$ 4.6 3.8 $\rm 12.5^{+0.6}_{-0.6}$ $\rm -0.15^{+0.12}_{-0.01}$
Ori Ia3 $\rm0.380^{+0.2}_{-0.2}$ 11.4 3.7 $\rm 16.6^{+0.9}_{-0.9}$ $\rm -0.54^{+0.05}_{-0.09}$
U Sco3 $\rm0.144^{+0.003}_{-0.003}$ 5-6 3.5 $\rm 14.2^{+0.2}_{-0.2}$ $\rm -0.59^{+0.06}_{-0.01}$
Lower Cen-Crux3 $\rm0.116^{+0.002}_{-0.002}$ 11-12 3.3 $\rm 15.0^{+0.3}_{-0.3}$ $\rm -0.85^{+0.05}_{-0.01}$
Upper Cen-Lup23 $\rm0.142^{+0.002}_{-0.002}$ 14-15 3.6 $\rm 22.1^{+0.4}_{-0.4}$ $\rm -1.05^{+0.01}_{-0.01}$
I Lac 23 $\rm0.368^{+0.06}$ 12-16 3.4 $\rm 20.7^{+3}_{-3}$ $\rm -1.15^{+0.2}_{-0.17}$
1 Figer (2008), and references therein; 2 Borissova et al. (2008);
3Wolff et al. (2007), and references therein.


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