Fig. 18
LCO/LTIR as a function of LTIR for various extragalactic sources: NGC 6240 (Meijerink et al. 2013), NGC 1266 (Pellegrini et al. 2013), M 83 (Wu et al. 2015b), Arp 220 (Rangwala et al. 2011), M 82 (Kamenetzky et al. 2012), Mrk 231 (van der Werf et al. 2010), and IC 342 (Rigopoulou et al. 2013). The sources are color coded based on the dominant heating mechanism: UV photons (red), X-rays (purple), and mechanical heating (blue). In addition, the threshold of LCO/LTIR ≲ 10-4 proposed by Meijerink et al. (2013) for PDRs and XDRs is shown as the dashed line.
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