Dense gas and star formation in the outer Milky Way

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Table 4

¹³CO(1−0) and C¹⁸O(1−0) intensities averaged over the maps.

Cloud	¹³CO	C¹⁸O	Ratio	χ_13/18
	(K km s⁻¹)	(K km s⁻¹)
21	0.60 ± 0.06	0.03 ± 0.06	≳20 ± 10	9.6
56	1.39 ± 0.07	0.20 ± 0.07	≳7.0 ± 2	10.3
57	0.85 ± 0.06	0.11 ± 0.06	≳7.7 ± 3	10.3

Notes. χ_13/18 is the ¹³CO to C¹⁸O abundance ratio at the galactocentric distance of the cloud, which for optically thin emission and equal excitation temperatures would be the intensity ratio. The last two columns can legitimately be compared.

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