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Table 2

Results derived from the single excitation temperature and non-LTE assumptions, when applicable.

Molecule Number of LTE non-LTE Gas pressure Reference for the
transitions Tex (K) N (cm-2) n(H2) (cm-3) Tkin (K) N (cm-2) (K cm-3) non-LTE estimate
COa 11 138 3.2 × 1018 2.2 × 107 This paper
13CO 7 93 ± 3 (4.7 ± 0.2) × 1016 115 6.0 × 1016 2.9 × 107 This paper
C18O 6 71 ± 2 (6.2 ± 0.2) × 1015 91 6.0 × 1015 3.1 × 107 This paper
C17O 5 65 ± 3 (1.8 ± 0.1) ×1015 1.8 × 1015 6.2 × 107 This paper
o-H2CO 9 146 ± 48 (1.5 ± 0.5) × 1012 4.0 × 1012 4.4 × 108 This paper
HCO+ 6 46 ± 3 (5.4 ± 0.3) × 1012 1.0 × 1014 2.1 × 107 This paper
CS 4 39 ± 2 (1.0 ± 0.1) × 1013 2.0 × 1013 1.1 × 108 This paper
o-H2S 3 27 ± 10 (1.5 ± 0.6) × 1014 5.0 × 1014 1.7 × 107 This paper
HCN 3 24 ± 2 (1.1 ± 0.1) × 1013 6 × 1013 8.5 × 107 This paper
C2H 5 57 ± 8 (8.2 ± 1.2) × 1013 b 105−106 100–150 8 × 1013 (1–15) × 107 Nagy et al. (2015b)
5 × 106 400 2 × 1013 2 × 109
CF+ 1 22 ± 4 (1.8 ± 0.3) × 1012 1.8 × 1012 1.7 × 107 This paperc
o-H2O 3 53 ± 18 (2.6 ± 0.9) × 1012 106 60 1.7 × 1012 6.0 × 107 Choi et al. (2014)
p-H2O 3 139 ± 92 (2.0 ± 1.3) × 1013 106 60 1.8 × 1013 6.0 × 107 Choi et al. (2014)
CN 7 27 ± 8 (4.7 ± 1.3) × 1013 2.0 × 1014 5.2 × 107 This paper
HNC 1 18.75–150 (0.2–1.6) × 1012 105 100 5 × 1012 107 This paper
SO 3 18.75–150 (0.01–1.0) × 1015 5 × 1014 2.5 × 107 This paper
NO 4 18.75–150 (9.4–50.6) × 1014 2 × 1014 8.8 × 107 This paper
NH3 1 18.75–150 (0.5–2.7) × 1013 2 × 105 145 1.1 × 1014 2.9 × 107 This paper
[Ci] 2 18.75–150 (5.1–27.7) × 1017 1 × 1018 7.3 × 106 This paper
CH 5 18.75–150 (1.4–2.1) × 1014 1014 4.3 × 106 This paper
H35Cl 3 18.75–150 (1.1–1.3) × 1013 This paper
H37Cl 3 18.75–150 (5.3–6.5) × 1012 This paper
C+ 1 18.75–150 (5.4–185.2) × 1018 1.1 × 1019 Ossenkopf et al. (2013)
SH+ 3 18.75–150 (2.8–5.5) × 1012 106 200 1013 2.0 × 108 Nagy et al. (2013)
CH+ 2 18.75–150 (2.1–2.3) × 1013 105 500–1000 9 × 1014 (5–10) × 107 Nagy et al. (2013) d
HF 1 18.75–150 (1.7–5.5) × 1012 100 1015 van der Tak et al. (2012)
OH+ 2 10–160 (5.5–82.1) × 1012 1014 van der Tak et al. (2013) e

Notes. The gas pressures are based on the parameters used for or derived from the non-LTE estimates. A single value is shown for the excitation temperature when inferred from the rotational diagram, and the assumed range of parameters is shown when the number of transitions and/or the energy coverage was not high enough to perform a rotational diagram fit.

(a)

The non-LTE column density of CO is based on the C17O column density and isotopic ratios of C18O/C17O of 3.2 and CO/C18O of 560 (Wilson & Rood 1994).

(b)

The difference between the LTE values quoted here and in Nagy et al. (2015b) is due to the combination of the updated beam efficiencies and conversion factors between the different beam sizes applied in this paper.

(c)

Based on the 3–2, 2–1, and 1–0 transitions from Neufeld et al. (2006) and the 5–4 transition detected as a part of this HIFI line survey. The difference in the rotation temperature compared to that quoted in Nagy et al. (2013) is due to the re-reduction of the CF+ 5–4 data with a more recent HIPE version.

(d)

The LTE estimate for CH+ is based on the J = 1–0 transition, while the non-LTE estimate (Nagy et al. 2013) is based on six transitions including four transitions observed with PACS.

(e)

The LTE estimate for OH+ is from van der Tak et al. (2013).

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