Molecular gas mass against 1.4 GHz radio continuum power for our group dominant galaxies. Points (circle, square or triangle) indicate systems detected in both radio and CO, arrows indicate 3σ upper limits on CO mass or 2σ limits on 1.4 GHz luminosity. The open triangle indicates the post-merger starburst galaxy NGC 7252. Red points indicate CLoGS galaxies whose groups have measured X-ray luminosities >1041 ergs−1, black points X-ray faint or unmeasured CLoGS systems, and cyan points non-CLoGS galaxies, both of which are X-ray bright. The black line represents the expected radio emission from star formation, assuming the molecular gas mass to star formation rate relation of Gao & Solomon (2004), with the grey shaded region indicating a range of a factor ± 5.
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