Molecular cloud matching in CO and dust in M33 - I. High-resolution hydrogen column density maps from Herschel

Open Access

Fig. 7.

X_CO factor (ratio) maps of methods I and II. Determined as the dust-derived H₂ column density over CO intensity determined at each position in both maps of M33 at 18.2″ and scaled with the $CO (\frac{2 - 1}{1 - 0})$ $\mathrm{CO(\frac{2-1}{1-0})}$ ratio to the CO(1 − 0) intensity of method I (top) and method II (bottom). The two ellipses correspond to an equivalent circular radius of 2 and 4 kpc.

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