ALMACAL - XIII. Evolution of the CO luminosity function and the molecular gas mass density out to z ∼ 6

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Table 1.

Properties of the CO transitions in the ALMACAL-22 survey

Transition	ν_rest	Redshift	Volume	N_ind	CV
	[GHz]		log[cMpc]³		%
CO(1 − 0)	115.27	0 − 0.37	4.85	173	4.85
CO(2 − 1)	230.54	0 − 1.70	6.07	240	1.75
CO(3 − 2)	345.54	0 − 3.15	6.30	259	1.51
CO(4 − 3)	461.04	0 − 4.40	6.39	274	1.20
CO(5 − 4)	576.27	0 − 5.80	6.44	287	1.07
CO(6 − 5)	661.47	0 − 7.10	6.47	284	1.40

Total			7.06	299

Notes. N_ind is the number of independent sightlines in which a given transition can be detected. CV is the percentage of cosmic variance estimated using Eq. (7) (see Sect. 5.3 for more details).

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