Herschel-HIFI observations of high-J CO and isotopologues in star-forming regions: from low to high mass

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Table 2

Overview of the main properties of the observed lines.

Mol.	Trans.	E_u/k_B	Frequency	Tel./Inst.-band	η_MB	Beam	Spec. Resol.	Exposure time (min)

		(K)	(GHz)			size (″)	(km s^-1)	LM0	LMI	IM	HM

¹²CO	3–2	33.2	345.796	JCMT	0.63	14	0.1/0.4	21	21	21	21
	10–9	304.2	1151.985	HIFI-5a	0.64	20	0.13^a	10	7	10	20
¹³CO	3–2	31.7	330.588	JCMT	0.63	15	0.1/0.4	32	32	32	32
	10–9	290.8	1101.350	HIFI-4b	0.74	21	0.14^a	40	30	40	42/59
C¹⁸O	3–2	31.6	329.331	JCMT	0.63	15	0.1/0.4	39	39	24	24
	5–4	79.0	548.831	HIFI-1a	0.76	42	0.07^b	60	–	31	–
	9–8	237.0	987.560	HIFI-4a	0.74	23	0.15^a	20	20	20	7
	10–9	289.7	1097.163	HIFI-4b	0.74	21	0.14^a	30^c	300	30	30

Notes.LM0: low-mass Class 0 sources. LMI: low-mass Class I objects. IM: intermediate-mass YSOs. HM: high-mass protostars.

^(a)

WBS data.

^(b)

HRS data.

^(c)

NGC 1333 IRAS 2A, 4A and 4B were observed for 300 min each.

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