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Fig. 11.

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Galaxy merger tree of the LISA host at z ∼ 1.0. The time evolution is represented as a function of the lookback time (tlookback). For reference, tlookback = 8.5 (11.5) Gyr corresponds to z ∼ 1 (z ∼ 13). Vertical black lines connect the secondary branches with the main ones (always at the bottom). Thus, the linking points between branches correspond to galaxy mergers. We highlight the baryonic mass ratio of the merging galaxies that caused the binary formation in red. The colour of each dot encodes the stellar mass of the galaxy. Finally, the extension of the grey arrow corresponds to the length of ΔtBin. The two galaxy merger trees reported in this figure show that multiple episodes of galaxy mergers can happen before and after the formation of the LISA source.

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