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2
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84875569483
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note
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⊙. The largest black holes weigh almost as much as our entire Galaxy. See the supplementary materials for a discussion on how MBH masses are measured.
-
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5
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84875571706
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Many theoretical models predict the existence of MBHs wandering in galactic halos, a product of the assembly history of galaxies and MBHs. These putative wandering MBHs would be very hard to detect due to their very low predicted luminosity and/or the short time scales over which they are active (55).
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6
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⊙.
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8
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84875561177
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When astronomers refer to heavy elements, they mean elements heavier than hydrogen and helium. Whereas hydrogen, helium, and a small amount of lithium were formed a few minutes after the Big Bang, all other elements have been formed through stellar nucleosynthesis.
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