Table C.1
Rotational temperatures (Trot), column densities (N), and abundances towards the Orion Bar PDR, (+10′′,–10′′) position.
| Extended source | Semi-extended source | ||||||
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| Trot [K] | N(X) [cm-2] | Trot [K] | N(X) [cm-2] | Abundance* | Notes | ||
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| cis-HCOOH | 23 (4) | 4.6 (0.7) × 1011 | 21 (4) | 4.2 (0.6) × 1012 | a | ||
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| trans-HCOOH Ka = 0 | 12 (2) | 3.5 (0.5) × 1011 | 6 (1) | 4.1 (0.6) × 1012 | a, b | ||
| trans-HCOOH Ka = 1 | 12 (3) | 3.3 (1.3) × 1011 | 6 (1) | 3.6 (2.1) × 1012 | a | ||
| trans-HCOOH Ka = 2 | 13 (3) | 6.3 (2.8) × 1011 | 7 (1) | 5.0 (2.4) × 1012 | a | ||
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| [(cis+trans)-HCOOH] | — | 1.8 (0.3) × 1012 | — | 1.7 (0.3) × 1013 | (0.3−2.7) × 10-10 | c | |
Notes. (a) Rotational temperatures and column densities from rotational diagram analysis. (b) ΔN calculated assuming an error of 15%. (c) Total column densities calculated as the sum of the cis and trans species.
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 (Cuadrado et al. 2015, and references therein).
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