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Table 3

Column density ratios with CH3OH as reference.

CH3NH2/CH3OH NH2CHO/CH3OH CH3CN/CH3OH References



13CH3CN CH3C15N


CH3OH reference 13C 18O 13C 18O 13C 18O 13C 18O
MM1 II 5.9 × 10−3 2.5 × 10−3 1.5 × 10−4 6.5 × 10−5 4.6 × 10−3 2.0 × 10−3 3.0 × 10−3 1.3 × 10−3 This work
MM2 I 1.5 × 10−3 9.2 × 10−4 1.9 × 10−4 1.1 × 10−4 2.1 × 10−3 1.3 × 10−3 1.9 × 10−3 1.1 × 10−3 This work
MM3 I 5.4 × 10−4 4.8 × 10−4 ≤9.0 × 10−6 ≤7.9 × 10−6 1.0 × 10−3 8.9 × 10−4 1.7 × 10−3 1.5 × 10−3 This work

Model F 7.3 × 10−3 0.04 4.5 × 10−4 1
Model M 4.0 × 10−3 0.02 2.3 × 10−4 1
Model S 1.8 × 10−3 0.76 3.4 × 10−4 1

Sgr B2(M) 8.0 × 10−3 2.5 × 10−3 0.03 2
Sgr B2(N) 0.03 0.07 0.11 2
Sgr B2(N) 0.10 0.04 2.8 × 10−3 3
Sgr B2(N2–5)(a) 8.3 × 10−3 – 0.09(b) 0.06 – 0.13 4
Orion KL Compact Ridge 1.7 × 10−3 0.01 5

IRAS 16293–2422B ≤5.3 × 10−5 10−3 4 × 10−3 6, 7, 8, 9

Notes. The uncertainty on the column density ratios derived towards NGC 6334 I is estimated to be 40% (see Sect. 2). (a) Range of values derived for the cores N2, N3, N4, and N5. (b)Excluding the upper limit on NH2CHO for N4.

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