Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 487, Issue 4, Pages 4827-4831Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz1569
Keywords
black hole physics; galaxies: active; galaxies: Seyfert; quasars: general; X-rays: galaxies
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Funding
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [681601]
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We consider black hole-galaxy coevolution using simple analytic arguments. We focus on the fact that several supermassive black holes are known with masses significantly larger than suggested by the M - sigma relation, sometimes also with rather small stellar masses. We show that these are likely to have descended from extremely compact blue nugget' galaxies born at high redshift, whose very high velocity dispersions allowed the black holes to reach unusually large masses. Subsequent interactions reduce the velocity dispersion, so the black holes lie above the usual M - sigma relation and expel a large fraction of the bulge gas (as in WISE J104222.11+164115.3) that would otherwise make stars, before ending at low redshift as very massive holes in galaxies with relatively low stellar masses, such as NGC 4889 and NGC 1600. We further suggest the possible existence of two new types of galaxy: low-mass dwarfs whose central black holes lie below the M - sigma relation at low redshift, and galaxies consisting of very massive () black holes with extremely small stellar masses.
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