THE FAILURE OF THE SMALL. “As an implicit consequence of massive black hole seeds, we have also assumed that seeds are not able to form in dark matter haloes below 2 × 10(11) M⊙, as cold gas might not be able to collapse in these haloes due to their shallow potential wells. This simultaneously reduces the number of faint AGN at high redshift, in better agreement with observations.” (AGN = active galactic nuclei; M⊙ = solar masses).
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