The ALMA-PILS survey: First detections of ethylene oxide, acetone and propanal toward the low-mass protostar IRAS 16293-2422

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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: 0.07^c	–	Garrod (2013)
Chemical model: peak grain-surface	0.37: 2.3: 0.39^c	–	Garrod (2013)
Chemical model of hot cores	–	1^d	Occhiogrosso et al. (2014)

Notes.

^(a)

Range reflects span for rotational states in the V_off = 0 km s^-1 and the V_off = 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 (ν_t = 1) excited states of acetaldehyde in the V_off = −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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