Exploring molecular complexity with ALMA (EMoCA): Simulations of branched carbon-chain chemistry in Sgr B2(N)

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Table 1

Selection of protostellar ice compositions from the literature, and post-collapse model values, as a percentage of H₂O.

Species	W33A^a	NGC 7538 IRS 9^b	Sgr A*^b	Typical	Typical	Collapse-phase
				low-mass^c	high-mass^c	model values

CO	8	16	<12	29	13	53
CO₂	13	22	14	29	13	14
CH₄	1.5	2	2	5	2	2.9
H₂CO	6	4	<3	≤2	≤2	1.8
CH₃OH	18	5	<4	3	4	6.9
NH₃	15	13	20–30	5	5	20

Reference.

^(a)

Gibb et al. (2000);

^(b)

See Gibb et al. (2000) for original references;

^(c)

Öberg et al. (2011).

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