HCN emission from translucent gas and UV-illuminated cloud edges revealed by wide-field IRAM 30 m maps of the Orion B GMC - Revisiting its role as a tracer of the dense gas reservoir for star formation

Open Access

Fig. 17

30″-resolution view of the Horse-head. (a) [C II] 158 µm (Pabst et al. 2017) and (b) [C I] 492 GHz (Philipp et al. 2006) integrated line intensity maps (from 7 to 18 km s⁻¹). (c) R = HCN/CO intensity ratio and (d) HCN J = 1−0 line intensity maps. Contours on [C II] 158 µm map: HCN/CO ratio (R = 0.06 and 0.12). Contours on [C I] 492 GHz map: HCN J =1−0 surface brightness (W = 2.7, 4.5, and 6 K km s⁻¹).

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