Millimeter wave spectra of ethyl isocyanate and searches for it in Orion KL and Sagittarius B2

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Table 3.

Methyl/ethyl ratios in Orion KL and Sgr B2.

Ratio	Orion KL	Sgr B2
Met-NCO/Et-NCO	≥10	≥10
Met-CN/Et-CN	0.55^a	1.35, 0.78^b
Met-OH/Et-OH	45^c	21, 15^d
Met-OCOH/Et-OCOH	120^e	15, 11^f

Notes.

^(a)

López et al. (2014), assuming hot core (v_LSR ≃ 3–5 km s⁻¹) and plateau Orion KL components.

^(b)

Belloche et al. (2009), for 63 and 73 km s⁻¹velocity components.

^(c)

Tercero et al. (2015), for south hot core (v_LSR ≃ 7–8 km s⁻¹).

^(d)

Belloche et al. (2009, 2013), for 63 and 73 km s⁻¹velocity components.

^(e)

Tercero et al. (2015), for the compact ridge of Orion KL.

^(f)

Belloche et al. (2009), for 64 and 74 km s⁻¹velocity components.

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