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Table 3

Fractional abundances and abundance ratios.

Molecule LTE LVG1
6.5 km s-1 7.0 km s-1 Total 6.5 km s-1 7.0 km s-1 Total
Ions Ions
X(HC18O+) × 550 3.9 × 10-9 1.8 × 10-9 2.5 × 10-9 4.6 × 10-9 1.7 × 10-9 2.7 × 10 -9
X(D13CO+) × 60 2.7 × 10-10 4.7 × 10-10 4.0 × 10-10 4.6 × 10-10 5.4 × 10-10 5.1 × 10 -10
X(HOCO+) 2.0 × 10-11 4.8 × 10-12 1.0 × 10-11 2.0 × 10-11 6.0 × 10-12 1.1 × 10 -11
X(DOCO+) 2.9 × 10-12 8.0 × 10-13 1.4 × 10-12 3.6 × 10-12 1.0 × 10-12 1.4 × 10 -12
X(SO+) 3.1 × 10-11 9.6 × 10-12 1.6 × 10 -11
X(HCS+) 8.1 × 10-12 1.2 × 10-11 1.1 × 10-11 2.1 × 10-11 1.1 × 10-11 1.4 × 10 -11
X(DCS+) 1.9 × 10-12 6.6 × 10-13 1.7 × 10-12 5.9 × 10 -13
X(HCNH+) 2.0 × 10-10 7.6 × 10-11 1.2 × 10-10 1.4 × 10-10 8.0 × 10-11 1.0 × 10 -10
X(H2COH+) 4.0 × 10-12 2.6 × 10 -12
X(CO+) < 7.9 × 10 -13
X(HOC+) < 2.6 × 10 -13
X(NNH+) 1.4 × 10 -9 ∗
X(NND+) 5.0 × 10 -10 ∗
Neutrals Neutrals
X(13C18O) 1.0 × 10-9 1.0 × 10-9 1.0 × 10-9 1.2 × 10-9 1.2 × 10-9 1.2 × 10 -9
X(H213CO) × 60a 1.9 × 10-9 7.8 × 10-10 1.1 × 10-9 3.4 × 10-9 2.1 × 10-9 2.5 × 10 -9
X(13CS) × 60 1.8 × 10-9 3.7 × 10-9 3.1 × 10-9 3.0 × 10-9 1.1 × 10-9 1.7 × 10 -9
X(S18O) × 550 3.7 × 10-8 6.3 × 10-9 1.8 × 10-8 5.0 × 10 -8 9.0 × 10 -9 2.2 × 10 -8
X(33SO) × 135 9.0 × 10-9 1.8 × 10-9 4.0 × 10-9 1.9 × 10-8 1.6 × 10-9 7.9 × 10-9
X(34SO2) × 22.5 1.0 × 10-9 1.0 × 10-9
X(SO2) 3.3 × 10-10 5.6 × 10-11 1.4 × 10-10 6.7 × 10 -10 9.0 × 10 -11 2.6 × 10 -10
X(OC34S) × 22.5 1.1 × 10-9 9.4 × 10-10
X(OCS) 6.2 × 10-10 9.4 × 10-11 2.4 × 10-10 7.0 × 10 -10 1.5 × 10 -11 2.2 × 10 -10
X(H213CS) × 60 4.0 × 10-10
X(CCS) 2.4 × 10-10 6.9 × 10-11 1.2 × 10-10 3.9 × 10-10 1.0 × 10-10 1.8 × 10 -10
X(H2S)a 3.9 × 10-10 7.7 × 10-11 1.7 × 10 -10
X(NS) 2.2 × 10-10 1.7 × 10-10 1.8 × 10 -10
X(HCN) 1.2 × 10 -8 ∗
Ion/Neutral and Ion/Ion Ion/Neutral and Ion/Ion
1.1 × 10-4 4.8 × 10-5 6.9 × 10-5 1.1 × 10-4 4.3 × 10-5 6.8 × 10 -5
0.07 0.26 0.15 0.1 0.32 0.19
9.0 × 10-6 1.2 × 10-5 1.1 × 10-5 1.1 × 10-5 1.4 × 10-5 1.2 × 10 -5
0.005 0.003 0.004 0.004 0.003 0.004
8.0 × 10-4 0.0014 9.5 × 10 -4
0.004 0.003 0.0035 0.007 0.01 0.008
0.24 0.06 0.08 0.04
0.003 0.007 0.004 0.004 0.006 0.005
0.01 0.008
0.005 0.002
< 3 × 10 -4
< 1 × 10 -4
Neutral/Neutral Neutral/Neutral
19 1.8 5 17 8 13
0.03 0.008 0.008 0.01 0.009 0.01
0.13 0.02 0.04 0.12 0.09 0.11
0.20
0.57 0.03 0.08 0.22 0.01 0.13

Notes.

(1)

LVG calculations assuming Tk = 12 K and n(H2) = 105 cm-3. Numbers in boldface are used in Fig. B.2 to Fig. B.6 to compare with observations.

(*)

From Daniel et al. (2013);

(a)

From Table 2 assuming OTP = 3.

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