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Table 3

Ice column estimates.

CO column density from submillimeter measurements by Harjunpää et al. (2004)
ice mass
isotop N(isotop) × 10-14 abundance × 102 @AJ CO gas CO total expected

[cm-2] column density [μ g cm-2]

AJ = 3.57 as for pos A12 Harjunpää et al. (2004)
13CO gas 45.0 1.108 3.57 19
13CO total 108.6 1.108 3.57 46 27
AJ = 3.45 as for sightline towards #947
13CO gas 43.5 1.108 3.45 18
13CO total 105.0 1.108 3.45 44 26

AJ = 3.57 as for pos A12 Harjunpää et al. (2004)
C18O gas 11.0 0.204 3.57 25
C18O total 14.5 0.204 3.57 33 8
AJ = 3.45 as for sightline towards #947
C18O gas 10.6 0.204 3.45 24
C18O total 14.0 0.204 3.45 32 8

ice column density using laboratory band strength measurements by Gerakines et al. (1995)
ice bandstrength × 1016 τ(ν)   dν N × 10-16 ice mass
[cm] [cm-1] [cm-2] column density [μ g cm-2]

H2O ice 2.00 100 61 15
CO ice 0.11 3.4 30 15
CO2 ice 0.11  <3  <30  <20

ice coat and grain size distribution gained
from extinction measurements fitted to a modified MRN model
ice refractive ice mantle volume  × 106 ice mass
indices [Å] [cm] column density [μ g  cm-2]

H2O ice Fig. 13a 16 29 28
CO ice Fig. 15b (mixture) 18 21 23

silicate band column density /volume)  × 10-3 band width

max(τsilicate) volume  × 106 mass τ(ν)   dν
[cm] [μ g  cm-2] [cm-1] [cm-1]

#2 0.40 33 115 12 110
#947 0.45 44 150 10 110

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