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Table 2

Relative abundances in different sources.

Source CH3COCH3/C2H5CHO CH3CHO/c-C2H4O References
IRAS 16293-2422 8 12 this study
Sgr B2(N) ≥ 3.6−14.5 a 3.7−7.4 b Belloche et al. (2013)
Survey of massive SF regions – 1.2−13.2 Ikeda et al. (2001)
Chemical model: peak gas-phase 0.22: 0.83: 0.07c – Garrod (2013)
Chemical model: peak grain-surface 0.37: 2.3: 0.39c – Garrod (2013)
Chemical model of hot cores – 1d Occhiogrosso et al. (2014)

Notes.

(a)

Range reflects span for rotational states in the Voff = 0 km s-1 and the Voff = 10 km s-1 components of Sgr B2(N). Propanal is not detected, therefore the upper limit is used after correction for a similar beam filling factor.

(b)

Range reflects span for the rotational and first torsionally (νt = 1) excited states of acetaldehyde in the Voff = −1 km s-1 component of Sgr B2(N).

(c)

Chemical model of hot cores for a slow, medium, and fast model, respectively.

(d)

The MONACO code (at 200 K and 1.2 × 106 yr).

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