Spatial distribution of organics in the Horsehead nebula: Signposts of chemistry driven by atomic carbon

Open Access

Table D.1

Abundances with respect to total hydrogen nuclei (N(X)/N_H, in units of 10⁻¹⁰).

Species	Horsehead^a		Orion Bar^b
	PDR	Dense core	PDR
H₂CO	${3.4}_{- 0.5}^{+ 0.5}$ $Mathematical equation: $\[3.4_{-0.5}^{+0.5}\]$$	${3.0}_{- 0.3}^{+ 0.4}$ $Mathematical equation: $\[3.0_{-0.3}^{+0.4}\]$$	9.0
CH₃OH	${0.4}_{- 0.3}^{+ 0.7}$ $Mathematical equation: $\[0.4_{-0.3}^{+0.7}\]$$	${1.8}_{- 0.3}^{+ 0.3}$ $Mathematical equation: $\[1.8_{-0.3}^{+0.3}\]$$	5.0
CH₂CO	${4.7}_{- 0.3}^{+ 0.3}$ $Mathematical equation: $\[4.7_{-0.3}^{+0.3}\]$$	${1.4}_{- 0.1}^{+ 0.1}$ $Mathematical equation: $\[1.4_{-0.1}^{+0.1}\]$$	0.9
CH₃CHO	${3.9}_{- 0.1}^{+ 0.2}$ $Mathematical equation: $\[3.9_{-0.1}^{+0.2}\]$$	${0.9}_{- 0.1}^{+ 0.1}$ $Mathematical equation: $\[0.9_{-0.1}^{+0.1}\]$$	0.8
CH₃CN	${1.3}_{- 0.1}^{+ 0.1}$ $Mathematical equation: $\[1.3_{-0.1}^{+0.1}\]$$	${0.2}_{- 0.1}^{+ 0.1}$ $Mathematical equation: $\[0.2_{-0.1}^{+0.1}\]$$	0.2
HC₃N	${0.3}_{- 0.1}^{+ 0.1}$ $Mathematical equation: $\[0.3_{-0.1}^{+0.1}\]$$	${0.3}_{- 0.1}^{+ 0.1}$ $Mathematical equation: $\[0.3_{-0.1}^{+0.1}\]$$	0.1
HNCO	${2.5}_{- 0.1}^{+ 0.2}$ $Mathematical equation: $\[2.5_{-0.1}^{+0.2}\]$$	${0.8}_{- 0.1}^{+ 0.1}$ $Mathematical equation: $\[0.8_{-0.1}^{+0.1}\]$$	0.2

Notes. The total hydrogen nuclei column density is estimated as N_H = N(X)/(N(H) + 2N(H₂)).

^(a)This work. Abundances calculated using N_H = 3.8 × 10²² cm⁻² (PDR) and N_H = 6.4 × 10²² cm⁻² (dense core).

^(b)Values from Cuadrado et al. (2017). Abundances calculated using N_H = 6.3 × 10²² cm⁻².

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