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Table 4

Rotational temperatures (Trot), column densities (N), and abundances with respect to hydrogen nuclei inferred in the Orion Bar PDR.

Uniform beam filling Semi-extended source
T rot N(X) T rot N(X) Abundance* Notes
[ K ] [ cm-2 ] [ K ] [ cm-2 ]
HCO 15 ± 2 (1.1 ± 0.3) × 1013 9 ± 2 (5.3 ± 3.5) × 1013 (1.7−8.4) × 10-10 a
o-H2CO Ka = 1 17 ± 2 (3.7 ± 0.6) × 1013 12 ± 1 (1.1 ± 0.3) × 1014 a
o-H2CO Ka = 3 17 (6.9 ± 1.0) × 1012 12 (1.1 ± 0.2) × 1013 b, c
p-H2CO Ka = 0 16 ± 2 (9.8 ± 1.4) × 1012 9 ± 1 (3.9 ± 0.6) × 1013 a, c
p-H2CO Ka = 2 18 ± 1 (6.2 ± 0.2) × 1012 13 ± 1 (1.3 ± 0.1) × 1013 a, c
[(o+p)-H 2 CO] – (6.0 ± 0.6) × 1013 – (1.7 ± 0.3) × 1014 (0.9−2.7) × 10-9 d
o-HCO 15 ± 3 (7.3 ± 2.4) × 1011 10 ± 2 (3.0 ± 1.1) × 1012 a
p-HCO 9 ± 1 (2.3 ± 0.4) × 1011 7 ± 1 (8.0 ± 1.2) × 1011 a, c
[(o+p)-H CO] – (9.6 ± 2.4) × 1011 – (3.8 ± 1.1) × 1012 (1.5−6.0) × 10-11 d
o-H2CS Ka = 1 30 ± 3 (3.1 ± 0.5) × 1012 19 ± 1 (1.3 ± 0.2) × 1013 a
o-H2CS Ka = 3 30 (6.7 ± 1.9) × 1011 19 (2.7 ± 0.4) × 1012 e, c
p-H2CS Ka = 0 29 ± 6 (5.0 ± 1.4) × 1011 16 ± 2 (2.6 ± 1.0) × 1012 a
p-H2CS Ka = 2 35 ± 8 (7.8 ± 4.4) × 1011 15 ± 3 (2.6 ± 1.9) × 1012 a
[(o+p)-H 2 CS] – (5.0 ± 0.7) × 1012 – (2.1 ± 0.3) × 1013 (0.8−3.3) × 10-10 d
HNCO 51 ± 7 (1.0 ± 0.1) × 1012 26 ± 3 (5.6 ± 1.3) × 1012 (1.6−8.9) × 10-11 a
CH 2 NH 28 ± 7 (1.1 ± 0.4) × 1012 27 ± 7 (2.4 ± 1.0) × 1012 (1.7−3.8) × 10-11 a
o-H2CCO Ka = 1 55 ± 2 (3.0 ± 0.1) × 1012 30 ± 2 (1.3 ± 0.2) × 1013 a
o-H2CCO Ka = 3 64 ± 6 (1.3 ± 0.3) × 1012 34 ± 1 (4.2 ± 0.7) × 1012 a
p-H2CCO Ka = 0 57 ± 4 (4.8 ± 0.6) × 1011 42 ± 3 (1.3 ± 0.2) × 1012 a
p-H2CCO Ka = 2 54 ± 3 (1.1 ± 0.1) × 1012 29 ± 2 (6.1 ± 1.8) × 1012 a
[(o+p)-H 2 CCO] – (5.9 ± 0.3) × 1012 – (2.5 ± 0.3) × 1013 (0.9−4.0) × 10-10 d
HC 3 N 43 ± 2 (4.2 ± 0.3) × 1011 27 ± 1 (3.2 ± 0.3) × 1012 (0.7−5.1) × 10-11 a
cis-HCOOH 23 ± 4 (4.6 ± 0.7) × 1011 21 ± 4 (4.2 ± 0.6) × 1012 f
trans-HCOOH Ka = 0 12 ± 2 (3.5 ± 0.5) × 1011 6 ± 1 (4.1 ± 0.6) × 1012 f
trans-HCOOH Ka = 1 12 ± 3 (3.3 ± 1.3) × 1011 6 ± 1 (3.6 ± 2.1) × 1012 f
trans-HCOOH Ka = 2 13 ± 3 (6.3 ± 2.8) × 1011 7 ± 1 (5.0 ± 2.4) × 1012 f
[(cis+trans)-HCOOH] – (1.8 ± 0.3) × 1012 – (1.7 ± 0.3) × 1013 (0.3−2.7) × 10-10 g
A-CH3CN Ka = 0 26 ± 2 (2.8 ± 0.5) × 1011 19 ± 1 (1.9 ± 0.6) × 1012 a
A-CH3CN Ka = 3 30 ± 1 (3.0 ± 0.6) × 1011 21 ± 1 (1.5 ± 0.6) × 1012 a
E-CH3CN Ka = 1 28 ± 2 (2.9 ± 0.5) × 1011 20 ± 1 (1.8 ± 0.4) × 1012 a
E-CH3CN Ka = 2 31 ± 1 (1.7 ± 0.2) × 1011 22 ± 1 (1.0 ± 0.3) × 1012 a
E-CH3CN Ka = 4 26 ± 1 (1.1 ± 0.4) × 1011 18 ± 1 (6.7 ± 3.2) × 1011 a
[(A+E)-CH 3 CN] – (1.2 ± 0.1) × 1012 – (6.9 ± 1.0) × 1012 (0.2−1.1) × 10-10 h
A-CH3OH Ka = 0 34 ± 2 (8.0 ± 0.6) × 1012 18 ± 2 (5.3 ± 1.1) × 1013 a
A-CH3OH Ka = ±1 26 ± 2 (3.5 ± 0.9) × 1012 14 ± 1 (2.8 ± 0.7) × 1013 a
E-CH3OH 36 ± 3 (1.9 ± 0.2) × 1013 26 ± 3 (6.5 ± 1.4) × 1013 a
[(A+E)-CH 3 OH] – (3.1 ± 0.2) × 1013 – (1.5 ± 0.2) × 1014 (0.5−2.4) × 10-9 h
A-CH3CHO 31 ± 2 (2.3 ± 0.3) × 1012 20 ± 1 (1.2 ± 0.2) × 1013 a
E-CH3CHO 33 ± 3 (2.6 ± 0.4) × 1012 21 ± 1 (1.2 ± 0.2) × 1013 a
[(A+E)-CH 3 CHO] – (4.9 ± 0.5) × 1012 – (2.4 ± 0.3) × 1013 (0.8−3.8) × 10-10 h

Notes.

(*)

The abundance of each species with respect to H nuclei is given by , with N(H2) ≃ 3 × 1022 cm-2 and N(H) ≃ 3 × 1021 cm-2 (van der Werf et al. 2013). (a) Trot and N from rotational diagram analysis. (b) Only two lines detected with the same Eu/k. N calculated assuming the same Trot that o-H2CO Ka = 1. (c) ΔN estimated assuming a 15% of the calculated N. (d) Total N calculated as the sum of the ortho and para species. (e) Only two lines detected with upper level energies of 138.3 K and 149.8 K. They are too similar for an accurate estimation of Trot and N from a rotational diagram analysis. N calculated assuming the same Trot that o-H2CS Ka = 1. (f) From Cuadrado et al. (2016). (g) Total N calculated as the sum of the cis and trans species. (h) Total N calculated as the sum of the A and E species.

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