Planck early results. XXII. The submillimetre properties of a sample of Galactic cold clumps

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Table 4

CO line parameters for selected lines-of-sight in seven cold core fields.

Target	Telescope	Line	FWHM	n_H₂^a	N_H₂^b
			( km s^-1)	(cm^-3)	(cm^-2)

S1	IRAM	¹²CO J=1 → 0	0.71 ± 0.04
	IRAM	¹²CO J=2 → 1	0.78 ± 0.07
	IRAM	¹³CO J=1 → 0	0.53 ± 0.01	3000	3.0 × 10²¹
	IRAM	¹³CO J=2 → 1	0.50 ± 0.02
	IRAM	C¹⁸O J=1 → 0	0.30 ± 0.02	2700	4.0 × 10²¹
	IRAM	C¹⁸O J=2 → 1	0.32 ± 0.01
S3	Onsala	¹²CO J=1 → 0	2.64 ± 0.03
	Onsala	¹³CO J=1 → 0	1.71 ± 0.04
	Onsala	C¹⁸O J=1 → 0	1.22 ± 0.08	19000	6.7 × 10²¹
S6	IRAM	¹³CO J=1 → 0	1.44 ± 0.02
	IRAM	¹³CO J=2 → 1	1.42 ± 0.02
	IRAM	C¹⁸O J=1 → 0	0.82 ± 0.01	5000	1.4 × 10²²
	IRAM	C¹⁸O J=2 → 1	0.91 ± 0.01
S7^c	IRAM	¹³CO J=1 → 0	1.60 ± 0.10
	IRAM	¹³CO J=2 → 1	1.70 ± 0.10
	IRAM	C¹⁸O J=1 → 0	1.40 ± 0.20	7300	5.6 × 10²¹
	IRAM	C¹⁸O J=2 → 1	1.60 ± 0.20
S8	Onsala	¹³CO J=1 → 0	2.06 ± 0.07
	Onsala	C¹⁸O J=1 → 0	1.82 ± 1.07	6400	1.3 × 10²²
S9A	Onsala	¹³CO J=1 → 0	2.54 ± 0.04
	Onsala	C¹⁸O J=1 → 0	1.57 ± 0.12	25000	1.8 × 10²²
S9B	Onsala	¹³CO J=1 → 0	1.95 ± 0.05
	Onsala	C¹⁸O J=1 → 0	1.41 ± 0.11	23000	1.6 × 10²²
S10	APEX	¹²CO J=2 → 1	1.39 ± 0.02
	APEX	¹³CO J=2 → 1	0.82 ± 0.03
	APEX	C¹⁸O J=2 → 1	0.35 ± 0.20	23000	1.8 × 10²²

Notes.

Average density along the line of sight.

Gas column density converted to H₂ column density using the following conversion factors: N_H₂=10⁶ × N(¹³CO); and N_H₂=10⁷ × N(C¹⁸O).

For this source, the lines are an assembly of three components, with strongly asymmetric shapes, which are difficult to analyse separately.

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