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Fig. 7.

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Properties of the galaxies hosting LISA MBHBs and single MBHs with the same mass as LISA sources. Left panel: median sSFR of galaxies hosting LISA sources (red) and single MBHs (blue) at different redshifts. The grey area represents the region where galaxies are considered passive galaxies (sSFR < 10−11 yr−1). Right panel: same as the left panel but for the gas fraction (fgas). The grey dotted line highlights the value fgas = 0.5. In all the panels, red and blue areas represent the 16th–84th percentile. The results shown in this figure highlight that the galaxies hosting LISA MBHBs are gas-rich and star-forming.

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