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Table 2

Physical parameters derived from H13CO+ (1–0) observations.

Region Vpeak [km s-1] dVFWHM [km s-1] NH13CO+ [cm-2] X H13CO+
min max mean min max mean min max mean min max mean

Aquila/W40 4.0 8.8 7.0 0.3 3.3 0.7 4.4 × 1010 1.7 × 1012 2.9 × 1010 2.8 × 10-12 1.2 × 10-11 5.5 × 10-11
Aquila/Serp S 3.8 8.9 7.3 0.3 2.3 0.8 4.6 × 1010 4.1 × 1012 3.3 × 1010 3.3 × 10-12 4.6 × 10-11 1.5 × 10-11
Aquila/cold 5.6 8.6 6.5 0.3 1.1 0.5 7.2 × 1010 5.7 × 1011 2.4 × 1011 9.2 × 10-12 4.1 × 10-11 2.2 × 10-11
Oph/main (L1688) 2.5 4.9 3.6 0.3 2.0 0.7 6.4 × 1011 2.9 × 1012 1.1 × 1012 8.0 × 10-12 2.0 × 10-10 3.3 × 10-11
Oph/cold 2.9 3.6 3.3 0.3 0.7 0.4 6.3 × 1011 1.5 × 1012 9.6 × 1011 2.2 × 10-11 1.2 × 10-10 5.5 × 10-11
Orion B/NGC 2023 8.1 11.7 10.0 0.2 2.3 1.0 2.6 × 1011 37.8 × 1011 15.2 × 1011 1.8 × 10-11 9.0 × 10-11 5.0 × 10-11
Orion B/NGC 2024 5.1 13.2 10.9 0.2 2.7 0.9 2.3 × 1011 37.9 × 1011 14.3 × 1011 1.9 × 10-11 9.7 × 10-11 5.8 × 10-11
Orion B/NGC 2068 7.1 14.8 10.9 0.2 1.8 0.6 2.3 × 1011 22.4 × 1011 10.2 × 1011 1.8 × 10-11 6.9 × 10-11 4.5 × 10-11
Orion B/NGC 2071 6.1 12.7 9.5 0.2 2.2 0.9 2.6 × 1011 42.0 × 1011 15.6 × 1011 1.8 × 10-11 1.1 × 10-10 4.5 × 10-11

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