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Say three galaxies, with equal fluxes, $f_1$, merge. How could I calculate their combined flux?

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    $\begingroup$ How much do you know about each galaxy? 3D maps of stars and dust ready for some computational dynamics? I think this question has context and you haven't yet shared any. If it's related to a class or a problem set in a book, then can you add what topics been introduced so far? Thanks! $\endgroup$
    – uhoh
    Commented Apr 4, 2021 at 22:12
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    $\begingroup$ Merging may induce star bursts and AGN activity, but also quenching, so the combined luminosity could go both ways. The result depends to a large degree on the mass ratio of the systems, as well as their relative inclination angle. As @uhoh says, much more details are needed, but even with those it’s not possible to predict the outcome in general. $\endgroup$
    – pela
    Commented Apr 5, 2021 at 7:38

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