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Well, you could go with either or both of those models....test them both, I don't see why not. Or, you could go with something completely different, in which case you'd have to hypothesise what was going on and test that idea you came up with. Develop a model from that. I think to do it properly, you're going to have quite a few examples of interacting quasar pairs in your study, so I'd go through the SDSS and 3df surveys and find as many as I could.
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