The IRAM-30 m line survey of the Horsehead PDR - III. High abundance of complex (iso-)nitrile molecules in UV-illuminated gas

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Table 2

Observation parameters for the observed lines.

Molecule	Transition	Frequency	HPBW	rms
		(GHz)	(′′)	(mK [T_mb])

CH₃CN	J = 5–4 K = 0,4^†	91.972	26.9	5.8
	J = 6–5 K = 0,5^†	110.356	22.4	9.8
	J = 7–6 K = 0,6^†	128.734	19.2	21.8
	J = 8–7 K = 0,7^†	147.105	16.8	20.9
CH₃NC	J = 5–4 K = 0,4^†	100.508	24.6	8.2
HC₃N	J = 9–8^†	81.881	30.2	19.1
	J = 10–9	90.979	27.2	5.4
	J = 11–10	100.076	24.7	8.7
	J = 12–11	109.173	22.7	11.0
HC₂NC	J = 9–8	89.419	27.7	5.4
	J = 10–9	99.354	24.9	7.1
	J = 11–10	109.289	22.6	9.3
HNC₃	J = 9–8	84.028	29.4	6.0
	J = 10–9	93.364	26.5	5.0
	J = 11–10	102.700	24.1	8.1
	J = 12–11	112.036	22.1	10.7
C₃N	N = 9–8^†	89.054	27.8	6.3
	N = 10–9^†	98.949	25.0	8.3
	N = 11–10^†	108.843	22.7	11.4

Notes.

^(†)

The quoted frequencies are characteristic values for the multiplet frequencies. The exact frequencies for each line are given in Tables A.1 to A.6.

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