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Table 1

Summary of the excitation temperatures (Tex) and column densities (Ntot) of the different tracers of hot corinos (CH3OH) and WCCC objects (CCH and C4H) derived in previous surveys obtained with single-dish telescope observations.

Graninger et al. (2016) Lindberg et al. (2016) Higuchi et al. (2018) L1527(b) IRAS 16293-2422(c)





Object type Molecule Tex Ntot Tex Ntot Tex Ntot Tex Ntot Tex Ntot
[K] [ × 1013cm−2] [K] [ × 1013cm−2] [K] [ × 1013cm−2] [K] [ × 1013cm−2] [K] [ × 1013cm−2]
WCCC tracers CCH ... ... ... ... 8 − 21 ≤52 8 ± 1 33 ± 3 18 ± 6 9 ± 6
C4H 7 − 15 <4 7 − 16.5(a) <1 ... ... 12.3 20 ± 4 12.3 1.2 ± 0.3

Hot corino tracer CH3OH 4 − 7 0.2 − 11 <123(a) 0.2 − 95 8 − 21 0.5 − 16 8 ± 1 8 ± 1 84 ± 6 90 ± 10

Resolution (au) 4100–13 000 7800–8200 2400–4900 2400–4900 500–2000

Notes. (a) Excitation temperatures taken from c-C3 H2 and H2 CO APEX observationsfor C4H and CH3 OH respectively (Lindberg et al. 2016).

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