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Table 9

Depletion-, deuteration-, and ionisation parameters of the clumps.

Source fD RD(HCO+) RD(N2H+)  ∑ ix(ions)i x(e)l x(e)u ζH2
[10-8] [10-8] [10-5] [10-17 s-1]

IRDC 18102-1800 MM1 0.7 ± 0.1 0.0002 ± 0.0001 0.002 ± 0.001 12.3 ± 6.4 3.5 29.2 115
G015.05+00.07 MM1 0.8 ± 0.1 0.006 ± 0.003 0.028 ± 0.005 0.9 ± 0.3 5.6 0.8 1.2
IRDC 18151-1208 MM2 1.6 ± 0.3 0.003 ± 0.001 0.010 ± 0.002a 0.7 ± 0.1 0.7 1.8 5.0
G015.31-00.16 MM3 2.7 ± 1.3 0.007 ± 0.002 ... 2.3 ± 0.8 0.6 0.7 5.5
IRDC 18182-1433 MM2 1.1 ± 0.2 0.014 ± 0.003 ... 4.9 ± 1.1 0.3 0.2 19.7
IRDC 18223-1243 MM3 1.3 ± 0.1 0.003 ± 0.001 0.013 ± 0.001a 1.8 ± 0.5 1.6 1.8 13.1
ISOSS J18364-0221 SMM1 0.6 ± 0.1 0.012 ± 0.006 ... 4.1 ± 1.3 ... 0.3 51.1

Notes. 

(a)

Calculated by utilising N(N2H+) from SSK08 (see Sects. 4.2 and 5.1).

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