Relationship between LIR and – the integrated Schmidt-Kennicutt law – from our compilation of CO-bright galaxies lying in overdensities or protoclusters (circles, same encoding as in Fig. 7; Table A.1). The three CO-bright HAEs are indicated individually. HAE229 is clearly separated from the two other HAEs with CO detections (Tadaki et al. 2014), potentially indicating that red and blue HAEs have a wide range of CO luminosities. Small numbers of HAE with CO detections prohibit us from deciding if this is a real astrophysical effect. Solid and dashed lines are the best-fitting relations for normal star-forming and starburst galaxies (Sargent et al. 2014). At least within this small sample, no clear bi-modality in the star-formation efficiency is observed (cf. Daddi et al. 2010b; Genzel et al. 2010).
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