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Home All issues Volume 538 (February 2012) A&A, 538 (2012) A137 Full HTML
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Table 5

Spectral-line parameters.

Source Transition vLSR Δv TMB a τ0bc Texc
[km s-1] [km s-1] [K] [K km s-1] [K]
IRAS 05399-0121 C17O(2−1) 8.68 ± 0.02 0.74 ± 0.06 0.79 ± 0.18 1.27 ± 0.14 [6.40, 9.64] 0.10 ± 0.05 12.8 ± 1.5
H13CO+(4−3) 8.62 ± 0.08 0.82 ± 0.16 0.09 ± 0.02 0.08 ± 0.02 0.11 ± 0.05 5.5 ± 0.5
DCO+(4−3) 8.58 ± 0.03 0.69 ± 0.06 0.33 ± 0.04 0.25 ± 0.03 0.51 ± 0.10 4.9 ± 0.3
N2H+(3−2) 8.73 ± 0.02 0.71 ± 0.07 0.88 ± 0.11 1.00 ± 0.11 [92.6%] 2.80 ± 0.20 5.0 ± 0.2
N2D+(3−2) 8.46 ± 0.04 0.53 ± 0.02 0.28 ± 0.03 0.14 ± 0.02 [91.6%] 0.68 ± 0.10 5.0 ± 0.2d
o-D2CO(40,4−30,3) 8.70 ± 0.22 2.20 ± 0.46 0.08 ± 0.03 0.18 ± 0.04 0.01 ± 0.001 18.6
SMM 1 C17O(2−1) 9.20 ± 0.01 0.93 ± 0.03 0.96 ± 0.17 1.85 ± 0.20 [7.00, 11.33] 0.15 ± 0.05 11.3 ± 1.0
H13CO+(4−3) ... ...  <0.13 ... ... ...
DCO+(4−3) 9.31 ± 0.01 0.47 ± 0.05 0.55 ± 0.07 0.42 ± 0.05 1.89 ± 0.20 4.5 ± 0.3
N2H+(3−2) 9.31 ± 0.02 0.66 ± 0.09 0.65 ± 0.07 0.70 ± 0.08 [92.6%] 2.43 ± 0.10 4.6 ± 0.3
N2D+(3−2) 9.20 ± 0.03 0.75 ± 0.07 0.38 ± 0.04 0.40 ± 0.04 [92.6%] 1.71 ± 0.20 4.6 ± 0.3d
o-D2CO(40,4−30,3) 9.21 ± 0.06 0.67 ± 0.16 0.15 ± 0.02 0.10 ± 0.02 0.02 ± 0.002 18.6
SMM 3 C17O(2−1) 8.68 ± 0.06 0.58 ± 0.09 0.35 ± 0.05 0.51 ± 0.09 [6.56, 9.52] 0.05 ± 0.03 11.0 ± 1.0
DCO+(4−3) 8.54 ± 0.03 0.42 ± 0.16 0.20 ± 0.02 0.09 ± 0.01 0.24 ± 0.03 5.1 ± 0.3
N2H+(3−2) 8.57 ± 0.03 0.85 ± 0.09 0.62 ± 0.09 0.67 ± 0.08 [92.6%] 1.23 ± 0.10 4.9 ± 0.3
N2D+(3−2) 8.39 ± 0.04 0.53 ± 0.11 0.21 ± 0.03 0.17 ± 0.03 [91.6%] 0.59 ± 0.10 4.9 ± 0.3d
IRAS 05405-0117 C17O(2−1) 9.20 ± 0.04 0.54 ± 0.04 0.30 ± 0.03 0.17 ± 0.03 [78.7%] 0.05 ± 0.03 10.5 ± 0.5
2nd v-comp. C17O(2−1) 1.30 ± 0.33 0.58 ± 1.08 0.17 ± 0.02 0.14 ± 0.02 [78.7%] ... ...
3rd v-comp. C17O(2−1) 2.98 ± 0.33 0.54 ± 1.08 0.20 ± 0.02 0.13 ± 0.02 [78.7%] ... ...
DCO+(4−3) ... ...  < 0.08 ... ... ...
N2H+(3−2) 9.30 ± 0.03 0.69 ± 0.06 0.66 ± 0.09 0.56 ± 0.07 [90.9%] 4.26 ± 0.10 4.5 ± 0.3
N2D+(3−2) 8.93 ± 0.15 0.53 ± 0.34 0.06 ± 0.01 0.04 ± 0.03 [91.5%] 0.16 ± 0.02 4.5 ± 0.3d
3rd v-comp. N2D+(3−2) 2.98 ± 0.20 0.53 ± 0.56 0.05 ± 0.01 0.05 ± 0.02 [92.4%] ... ...
SMM 4 (2nd v-comp.) C17O(2−1) 1.67 ± 0.05 0.92 ± 0.19 0.32 ± 0.06 0.61 ± 0.08 0.06 ± 0.03 9.7 ± 1.2
2nd v-comp. H13CO+(4−3) 1.53 ± 0.08 0.43 ± 0.15 0.15 ± 0.02 0.07 ± 0.02 1.02 ± 0.60 4.0 ± 0.2
2nd v-comp. DCO+(4−3) 1.65 ± 0.03 0.49 ± 0.09 0.21 ± 0.04 0.19 ± 0.03 0.76 ± 0.50 4.0 ± 0.3
2nd v-comp. N2H+(3−2) 1.62 ± 0.78 0.61 ± 21.10 0.32 ± 0.07 0.27 ± 0.07 [92.6%] 1.59 ± 0.50 4.0 ± 0.3
2nd v-comp. N2D+(3−2) 1.49 ± 0.04 0.54 ± 0.10 0.24 ± 0.03 0.17 ± 0.03 [90.9%] 1.50 ± 0.20 4.0 ± 0.3d
SMM 5 C17O(2−1) 9.37 ± 0.03 0.54 ± 0.01 0.22 ± 0.02 0.14 ± 0.02 [78.7%] 0.04 ± 0.03 10.1 ± 0.5
DCO+(4−3) ... ...  <0.07 ... ... ...
N2H+(3−2) 9.43 ± 0.07 0.44 ± 0.17 0.16 ± 0.03 0.14 ± 0.02 [92.6%] 0.67 ± 0.04 3.8 ± 0.1
N2D+(3−2) ... ...  <0.11 ... ... ...
SMM 6 C17O(2−1) 9.51 ± 0.04 0.54 ± 0.04 0.28 ± 0.03 0.15 ± 0.03 [69.4%] 0.05 ± 0.03 9.7 ± 0.5
DCO+(4−3) 9.47 ± 0.02 0.42 ± 0.04 0.37 ± 0.05 0.19 ± 0.02 3.47 ± 0.20 4.0 ± 0.3
N2H+(3−2) 9.52 ± 0.03 0.65 ± 0.09 0.51 ± 0.06 0.44 ± 0.06 [92.6%] 5.75 ± 0.35 4.2 ± 0.2
N2D+(3−2) 9.25 ± 0.03 0.56 ± 0.10 0.33 ± 0.03 0.26 ± 0.03 [90.9%] 2.92 ± 0.30 4.2 ± 0.2d
Ori B9 N C17O(2−1) 9.29 ± 0.33 0.54 ± 1.08 0.30 ± 0.05 0.20 ± 0.03 [96.0%] 0.04 ± 0.03 11.6 ± 1.0
2nd v-comp. C17O(2−1) 1.85 ± 0.33 1.39 ± 1.08 0.29 ± 0.05 0.70 ± 0.08 0.04 ± 0.03 11.7 ± 2.0
DCO+(4−3) 9.42 ± 0.19 0.47 ± 1.38 0.04 ± 0.01 0.02 ± 0.02 0.05 ± 0.02 4.9 ± 0.3
2nd v-comp. DCO+(4−3) 2.11 ± 0.11 0.78 ± 0.31 0.09 ± 0.01 0.09 ± 0.02 0.14 ± 0.08 4.6 ± 0.5
N2H+(3−2) 8.80 ± 0.16 0.44 ± 0.24 0.05 ± 0.02 0.05 ± 0.02 [92.6%] 0.12 ± 0.03 4.1 ± 0.2
2nd v-comp. N2H+(3−2) 1.81 ± 0.11 0.85 ± 0.11 0.09 ± 0.02 0.13 ± 0.03 [92.6%] 0.23 ± 0.07 4.1 ± 0.2
N2D+(3−2) ... ...  <0.07 ... ... ...
SMM 7 C17O(2−1) 3.75 ± 0.02 1.04 ± 0.05 0.66 ± 0.09 0.82 ± 0.09 [1.38, 4.95] 0.15 ± 0.05 8.9 ± 1.0
“9 km s-1”-comp. C17O(2−1) 9.04 ± 0.07 0.55 ± 1.74 0.10 ± 0.06 0.07 ± 0.03 [69.4%] ... ...
DCO+(4−3) 3.70 ± 0.04 0.42 ± 0.10 0.22 ± 0.02 0.10 ± 0.02 0.94 ± 0.20 3.9 ± 0.3
N2H+(3−2) 4.01 ± 0.14 0.67 ± 0.27 0.14 ± 0.02 0.17 ± 0.04 [92.6%] 0.49 ± 0.07 3.9 ± 0.2
N2D+(3−2) ... ...  <0.07 ... ... ...

Notes. 

(a)

Integrated intensity is derived from a Gaussian fit or, in the case of some C17O lines, by integrating over the velocity range indicated in brackets. The percentage in brackets indicates the contribution of hf component’s intensity lying within the Gaussian fit.

(b)

For C17O, H13CO+, DCO+, N2H+, and N2D+τ0 is the optical thickness in the centre of a hypothetical unsplit line (see text).

(c)

For C17O, H13CO+, DCO+, and N2H+ the values of τ0 and Tex were estimated using RADEX with the kinetic temperature (Tkin) and the H2 density ( ⟨ n(H2) ⟩ ). The value of τ0 for N2D+ and o-D2CO was estimated using CLASS/Weeds; see Sect. 4.4 for details.

(d)

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

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