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

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Volume 601 (May 2017)

A&A, 601 (2017) A48

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Table 3

Ratios of branched-chain molecules with their straight-chain forms, for each model, as well as ratios between larger and smaller homologues.

Molecular ratio	Fast		Medium		Slow		Observations

	Low E_A	High E_A	Low E_A	High E_A	Low E_A	High E_A

C₃H₇CN, i/n	3.0	0.45	0.24	0.17	1.8	1.5	0.40 ± 0.06 ^a
C₄H₉CN, i/n	0.84	1.5	0.61	0.60	1.9	2.2	–
s/n	4.3	4.1	2.4	2.6	1.9	1.7	–
t/n	0.042	0.027	0.015	0.013	0.10	0.085	–
(i+s+t)/n	5.4	5.8	3.0	3.1	3.9	4.1	–
C₄H₁₀, i/n	0.13	0.13	0.055	0.054	0.36	0.36	–
C₅H₁₂, i/n	33	31	3.0	2.9	2.0	2.0	–
neo/n	0.28	0.27	0.11	0.10	0.48	0.48	–
(neo+i)/n	34	32	3.2	3.0	2.6	2.6	–
C₂H₅CN/CH₃CN	4.0	2.1	15	12	10	5.5	2.8^b
C₂H₅CN/C₂H₃CN	9.2	7.5	6.5	6.2	4.7	3.8	15^b
n-C₃H₇CN/C₂H₅CN	0.024	0.14	0.13	0.17	0.054	0.67	0.029^a^b
C₃H₇CN (total)/C₂H₅CN	0.098	0.21	0.16	0.20	0.15	0.16	0.041^a^b
n-C₄H₉CN/n-C₃H₇CN	0.52	0.11	0.33	0.31	1.1	1.0	<0.59^c
C₄H₉CN (total)/C₃H₇CN (total)	0.82	0.52	1.1	1.1	1.8	2.1	–

Reference. Observed ratios obtained by Belloche et al. (2014, 2016) are also shown.

^(a)

Belloche et al. (2014);

^(b)

Belloche et al. (2016);

^(c)

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