NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-20 T22:56:12 PDT
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For refcode 2016MNRAS.460.1147B:
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Copyright by Royal Astronomical Society. 2016MNRAS.460.1147B The origin of compact galaxies with anomalously high black hole masses Barber, Christopher; Schaye, Joop; Bower, Richard G.; Crain, Robert A.; Schaller, Matthieu; Theuns, Tom Abstract. Observations of local galaxies harbouring supermassive black holes (BH) of anomalously high mass, M_BH_, relative to their stellar mass, M_*_, appear to be at odds with simple models of the co-evolution between galaxies and their central BHs. We study the origin of such outliers in a Lambda cold dark matter context using the EAGLE cosmological, hydrodynamical simulation. We find 15 'M_BH_(M_*_)-outlier' galaxies, defined as having M_BH_ more than 1.5 dex above the median M_BH_(M_*_) relation in the simulation, M_BH, med_(M_*_). All M_BH_(M_*_)-outliers are satellite galaxies, typically with M_*_ ~ 10^10^ M_sun_ and M_BH_ ~ 10^8^ M_sun_. They have all become outliers due to a combination of tidal stripping of their outer stellar component acting over several Gyr and early formation times leading to rapid BH growth at high redshift, with the former mechanism being most important for 67 per cent of these outliers. The same mechanisms also cause the M_BH_(M_*_)-outlier satellites to be amongst the most compact galaxies in the simulation, making them ideal candidates for ultracompact dwarf galaxy progenitors. The 10 most extreme central galaxies found at z = 0 (with log_10_(M_BH_/M_BH, med_(M_*_)) is an element of [1.2, 1.5]) grow rapidly in M_BH_ to lie well above the present-day M_BH_ - M_*_ relation at early times (z >~ 2), and either continue to evolve parallel to the z = 0 relation or remain unchanged until the present day, making them 'relics' of the high-redshift universe. This high-z formation mechanism may help to explain the origin of observed M_BH_(M_*_)-outliers with extended dark matter haloes and undisturbed morphologies. Key words: black hole physics, methods: numerical, galaxies: evolution, galaxies: formation, galaxies: nuclei, galaxies: stellar content
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