Extended Data Fig. 3: Far-UV field in the Cygnus region.
From: Ionized carbon as a tracer of the assembly of interstellar clouds
a, The large-scale FUV field on a log-scale in Habing units Go, determined from a census of the O and B-stars from the Cyg OB2 cluster that are indicated in the panel. The grey box outlines the area shown in panel b. The observed CII emission is overlaid with black contours, corresponding to 50 K km/s to 210 K km/s by 40 K km/s. b, The FUV field in the DR21 and W75N region on a linear scale with the CII contours identical to the ones in panel a.
