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Table 4

Spectral line parameters.

Source Transition vLSR Δv a τ0b Texc
[km s-1] [km s-1] [K] [K km s-1] [K]
IRDC 18102-1800 MM1 C17O(2−1) 21.5 ± 0.02 2.36 ± 0.06 0.85 ± 0.06 2.58 ± 0.05 [18.4,  25.0] 0.08 ± 0.01 18.5 ± 0.4
H13CO+(3−2) 21.7 ± 0.08 2.92 ± 0.53 0.37 ± 0.05 1.25 ± 0.06 [18.5,  24.2] 0.99 ± 0.45 4.6 ± 0.3
DCO+(3−2) 22.0 ± 0.2 0.56 ± 3.49 0.04 ± 0.01 0.04 ± 0.02 [21.1,  22.8] 0.05 ± 0.01 4.6 ± 0.3
N2H+(3−2) 21.9 ± 0.02 3.56 ± 0.02 2.47 ± 0.27 17.62 ± 0.12 [15.6,  28.6] 16.92 ± 7.28 8.2 ± 0.1
N2D+(3−2) 22.0 ± 0.1 0.80 ± 0.20 0.07 ± 0.01 0.07 ± 0.01 [21.5,  23.0] 0.06 8.2 ± 0.1d
c-C3H2(33,0 − 22,1) 21.3 ± 0.1 1.10 ± 0.26 0.08 ± 0.01 0.07 ± 0.02 [20.6,  22.4] 0.45 ± 0.19 3.4 ± 0.1
CH3NH2(72,5 − 71,5)e 21.1 ± 0.2 5.07 ± 0.58 0.05 ± 0.01 0.24 ± 0.03 [16.7,  25.1] 0.003 50.4
OCS(19−18)e 21.7 ± 0.2  −|   | −   −|   | −   −|   | −  [17.4,  25.4] 0.01 ± 0.0003 13.2 ± 0.4
13CS(5−4) 22.3 ± 0.2 2.69 ± 0.38 0.05 ± 0.01 0.18 ± 0.02 [19.7,  24.7] 0.07 ± 0.01 4.7 ± 0.2
SiO(6 − 5) 21.5 ± 0.4 6.66 ± 1.28 0.11 ± 0.04 1.30 ± 0.11 [16.5,  25.3] 0.42 ± 0.27 4.0 ± 0.7
G015.05+00.07 MM1 C17O(2−1) 24.6 ± 0.03 2.22 ± 0.24 0.74 ± 0.04 2.05 ± 0.05 [21.6, 26.9] 0.08 ± 0.01 16.4 ± 1.7
H13CO+(3−2) 24.5 ± 0.1 1.66 ± 0.24 0.08 ± 0.01 0.20 ± 0.02 [22.8,  26.8] 0.11 ± 0.01 4.9 ± 0.1
DCO+(3−2) 24.1 ± 0.1 0.67 ± 0.15 0.08 ± 0.003 0.07 ± 0.01 [23.3,  25.2] 0.09 ± 0.01 4.9 ± 0.1
N2H+(3−2) 24.7 ± 0.1 4.58 ± 0.29 0.48 ± 0.06 2.47 ± 0.09 [19.9,  29.3] 0.98 ± 0.14 5.2 ± 0.1
N2D+(3−2) 24.1 ± 0.1 0.53 ± 0.13 0.06 ± 0.01 0.03 ± 0.01 [23.4,  25.4] 0.12 5.2 ± 0.1d
IRDC 18151-1208 MM2 C17O(2−1) 29.5 ± 0.02 2.75 ± 0.15 1.03 ± 0.04 3.33 ± 0.05 [26.5,  32.8] 0.09 ± 0.01 20.8 ± 1.9
H13CO+(3−2) 29.5 ± 0.04 2.47 ± 0.11 0.64 ± 0.05 1.63 ± 0.06 [27.4,  31.8] 0.44 ± 0.10 6.8 ± 0.4
DCO+(3−2) 29.4 ± 0.03 1.43 ± 0.10 0.33 ± 0.03 0.75 ± 0.03 [27.3,  31.3] 0.15 ± 0.03 7.2 ± 0.6
c-C3H2(33,0 − 22,1) 29.5 ± 0.2 2.87 ± 0.49 0.07 ± 0.02 0.18 ± 0.05 [27.2,  31.5] 0.08 ± 0.02 4.8 ± 0.3
N2D+(3−2) 29.4 ± 0.1 1.03 ± 0.18 0.11 ± 0.03 0.27 ± 0.03 [28.3,  30.9] 0.04 14.0 ± 2.0f
C2D(3−2)g 29.6 ± 0.3 2.68 ± 0.77 0.07 ± 0.02 0.45 ± 0.07h 0.02 20.8
CH2CHC15N(252,24 − 250,25)g 30.1 ± 0.5 3.15 ± 0.97 0.04 ± 0.02 0.14 ± 0.01 [27.8,  33.3] 0.001 101.2
U216452.511 29.4 ± 0.2 2.06 ± 0.49 0.05 ± 0.02 0.13 ± 0.02 [28.0,  31.3] ... ...
SiO(6 − 5) 30.5 ± 1.0 46.80 ± 2.36 0.09 ± 0.03 1.93 ± 0.20 [–6.1,  72.6] 0.09 ± 0.01 5.7 ± 0.1
G015.31-00.16 MM3 C17O(2−1) 31.0 ± 0.03 0.80 ± 0.09 0.41 ± 0.07 0.80 ± 0.04 [28.9,  32.3] 0.10 ± 0.01 10.2 ± 0.6
H13CO+(3−2) 31.4 ± 0.2 0.89 ± 0.14 0.03 ± 0.01 0.05 ± 0.02 [30.2,  32.5] 0.18 ± 0.01 3.5 ± 0.1
DCO+(3−2) 30.8 ± 0.2 0.87 ± 0.15 0.03 ± 0.01 0.06 ± 0.01 [29.8,  31.9] 0.13 ± 0.02 3.4 ± 0.1
N2H+(3−2) 30.9 ± 0.04 0.86 ± 0.18 0.26 ± 0.02 0.31 ± 0.02 [29.9,  31.9]i 4.64 ± 1.30 3.9 ± 0.1
IRDC 18182-1433 MM2 C17O(2−1) 41.0 ± 0.02 1.32 ± 0.08 0.74 ± 0.08 1.82 ± 0.03 [38.0,  43.0] 0.13 ± 0.01 12.6 ± 0.5
H13CO+(3−2) 40.7 ± 0.1 1.20 ± 0.34 0.11 ± 0.02 0.22 ± 0.02 [39.4,  42.5] 0.50 ± 0.03 3.8 ± 0.1
DCO+(3−2) 41.1 ± 0.3 2.08 ± 0.90 0.09 ± 0.01 0.20 ± 0.03 [38.6,  43.3] 0.28 ± 0.02 3.8 ± 0.1
c-C3H2(33,0 − 22,1) 40.9 ± 0.1 1.58 ± 0.31 0.07 ± 0.01 0.12 ± 0.02 [39.3,  42.4] 1.29 ± 0.13 3.1 ± 0.1
CH3COCH3(159,7 − 148,6) ?j 41.3 ± 0.1 1.80 ± 0.14 0.17 ± 0.01 0.35 ± 0.03 [39.5,  42.9] 0.01 63.9
IRDC 18223-1243 MM3 C17O(2−1) 45.5 ± 0.04 3.09 ± 0.10 0.56 ± 0.04 1.97 ± 0.05 [42.1,  49.0] 0.06 ± 0.01 18.2 ± 1.1
H13CO+(3−2) 45.5 ± 0.04 1.81 ± 0.26 0.39 ± 0.03 0.83 ± 0.04 [43.4,  47.0] 0.47 ± 0.05 5.5 ± 0.1
DCO+(3−2) 45.9 ± 0.1 1.83 ± 0.18 0.11 ± 0.01 0.23 ± 0.02 [43.4,  47.6] 0.08 ± 0.01 5.6 ± 0.2
N2D+(3−2) 45.3 ± 0.3 1.13 ± 0.63 0.08 ± 0.02 0.20 ± 0.03 [44.2,  47.7] 0.05 9.4 ± 0.3f
c-C3H2(33,0 − 22,1) 45.7 ± 0.1 1.84 ± 0.15 0.15 ± 0.03 0.22 ± 0.02 [43.6,  47.0] 0.38 ± 0.05 4.0 ± 0.1
SiO(6 − 5) 44.4 ± 0.6 8.22 ± 1.26 0.07 ± 0.03 0.84 ± 0.08 [38.0,  52.6] 0.11 ± 0.01 4.9 ± 0.1
ISOSS J18364-0221 SMM1 C17O(2−1) 34.8 ± 0.02 1.60 ± 0.05 0.79 ± 0.03 1.69 ± 0.03 [32.5,  37.0] 0.17 ± 0.01 10.9 ± 0.2
H13CO+(3−2) 34.7 ± 0.05 0.86 ± 0.14 0.30 ± 0.04 0.44 ± 0.04 [33.5,  36.1] 1.07 ± 0.38 4.3 ± 0.2
DCO+(3−2) 34.9 ± 0.03 1.14 ± 0.10 0.33 ± 0.02 0.50 ± 0.02 [33.5,  36.3] 0.69 ± 0.20 4.4 ± 0.2

Notes. 

(a)

Intensities are integrated over the velocity range given in square-brackets. In the cases of I18102 MM1, I18151 MM2, and I18223 MM3, 92.5% of the total N2D+(3−2) hf component’s intensity lie within the quoted velocity range. For G015.05 MM1 the fraction is 81.7%.

(b)

For C17O, H13CO+, DCO+, N2H+, and N2D+τ0 is the optical thickness in the centre of a hypothetical unsplit line. For C2D τ0 is the sum of the peak optical thicknesses of all the hf components.

(c)

See Sect. 4.2 for details on Tex determination.

(d)

Tex is assumed to be the same as for N2H+(3−2).

(e)

Another candidate for this spectral line is the OCS(19 − 18) transition. Alternatively, the two lines could be blended. It could also be caused by C18O(2−1) seen in the image band.

(f)

Tex [N2H+(1 − 0)]  from SSK08.

(g)

Another detected hf group of C2D(3−2) is blended with CH2CHC15N(252,24 − 250,25).

(h)

Integrated intensity over the two detected hf groups between [27.7,  30.7] and [–49.5,  –46.5] km s-1.

(i)

92.6% of the hf component’s intensity lie within the quoted velocity range.

(j)

This line may also be caused by C18O(2−1) seen in the image band.

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