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Table 3

Spectral-line parameters.

Source Transition v LSR Δv T MB a τ 0 b T ex c
[km s-1] [km s-1] [K] [K km s-1] [K]
SMM 6a C17O(2−1) 9.45 ± 0.02 0.36 ± 0.05 0.28 ± 0.05 0.12 ± 0.02 [9.09, 10.46; 73.4%] 0.05 ± 0.01 10.0
N2H+(3−2) 9.42 ± 0.01 0.27 ± 0.02 0.71 ± 0.11 0.56 ± 0.06 [6.26, 12.00; 99.9%] 1.62 ± 0.28 5.0
N2D+(3−2) 9.38 ± 0.01 0.33 ± 0.01 0.47 ± 0.10 0.30 ± 0.04 [8.22, 11.09; 92.6%] 0.52 ± 0.04 5.0
SMM 6b C17O(2−1) 9.55 ± 0.02 0.34 ± 0.02 0.48 ± 0.06 0.39 ± 0.05 [7.69, 10.74; 100%] 0.09 ± 0.01 10.0
N2H+(3−2) 9.44 ± 0.01 0.27 ± 0.03 0.49 ± 0.08 0.37 ± 0.04 [7.90, 10.67; 92.6%] 0.81 ± 0.06 5.0
N2D+(3−2) 9.38 ± 0.02 0.33 ± 0.04 0.35 ± 0.05 0.21 ± 0.03 [8.46, 10.67; 92.6%] 0.36 ± 0.01 5.0
SMM 6c C17O(2−1) 9.45 ± 0.01 0.42 ± 0.03 0.68 ± 0.08 0.46 ± 0.05 [7.66, 10.42; 100%] 0.14 ± 0.01 10.0
SMM 6c (2nd v-comp.) C17O(2−1) 2.25 ± 0.10 0.34 ± 0.29 0.21 ± 0.02 0.06 ± 0.04 [1.50, 2.79; 78.7%] 0.04 ± 0.01 10.0
N2H+(3−2) 9.41 ± 0.02 0.27 ± 0.04 0.34 ± 0.06 0.23 ± 0.03 [8.57, 11.72; 96.1%] 0.48 ± 0.02 5.0
SMM 6c (2nd v-comp.) N2H+(3−2) 2.36 ± 0.03 0.27 ± 0.03 0.16 ± 0.05 0.05 ± 0.01 [1.92, 3.04; 89.9%] 0.20 ± 0.01 5.0
N2D+(3−2) 9.42 ± 0.03 0.33 ± 0.02 0.21 ± 0.02 0.10 ± 0.02 [8.53, 10.32; 90.9%] 0.20 ± 0.01 5.0
SMM 6d C17O(2−1) 9.45 ± 0.01 0.39 ± 0.03 0.60 ± 0.06 0.42 ± 0.05 [6.82, 10.98; 100%] 0.12 ± 0.01 10.0
N2H+(3−2) 9.45 ± 0.01 0.27 ± 0.02 0.32 ± 0.07 0.26 ± 0.03 [8.22, 12.03; 96.2%] 0.45 ± 0.03 5.0
N2D+(3−2) 9.38 ± 0.04 0.35 ± 0.11 0.17 ± 0.02 0.14 ± 0.04 [7.73, 10.53; 87.2%] 0.16 ± 0.01 5.0

Notes.

(a)

Integrated intensity was computed by integrating over the velocity range indicated in square brackets (in km s-1). The percentage value indicates the contribution of hf components’ intensity lying within the corresponding velocity range.

(b)

The optical thickness in the centre of the strongest hf component; it was derived using the assumed Tex value given in the last column.

(c)

Tex is assumed to be the same for the J = 3−2 transition of N2H+ and N2D+. See Sect. 4.5 for details.

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