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Fig. 8.


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Fractions of LISA MBHB sources (left panels) and single MBHs (right panels) hosted in elliptical (red), classical bulge (green), pseudobulge (blue), and extreme-late type (purple) galaxies at different redshifts. Top, middle, and bottom panels correspond to different mass bins: 104 − 105M, 105 − 106M, and 106 − 107M, respectively. We note that the MBHB hosts have noisier distributions because their number density is up to 2 − 3 orders of magnitude smaller than that of single MBHs (see Fig. 5). Briefly, galaxies hosting LISA systems display a disc-dominated morphology whose bulge component is more pronounced towards lower redshifts.

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