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Supermassive black holes in the EAGLE Universe : revealing the observables of their growth.

Rosas-Guevara, Y. and Bower, R.G. and Schaye, J. and McAlpine, S. and Dalla Vecchia, C. and Frenk, C.S. and Schaller, M. and Theuns, T. (2016) 'Supermassive black holes in the EAGLE Universe : revealing the observables of their growth.', Monthly notices of the Royal Astronomical Society., 462 (1). pp. 190-205.


We investigate the evolution of supermassive black holes in the ‘Evolution and Assembly of GaLaxies and their Environments’ (EAGLE) cosmological hydrodynamic simulations. The largest of the EAGLE volumes covers a (100 cMpc)3 and includes state-of-the-art physical models for star formation and black hole growth that depend only on local gas properties. We focus on the black hole mass function, Eddington ratio distribution and the implied duty cycle of nuclear activity. The simulation is broadly consistent with observational constraints on these quantities. In order to make a more direct comparison with observational data, we calculate the soft and hard X-ray luminosity functions of the active galactic nuclei (AGN). Between redshifts 0 and 1, the simulation is in agreement with data. At higher redshifts, the simulation tends to underpredict the luminosities of the brightest observed AGN. This may be due to the limited volume of the simulation, or a fundamental deficiency of the underlying model. It seems unlikely that additional unresolved variability can account for this difference. The simulation shows a similar ‘downsizing’ of the AGN population as seen in observational surveys.

Item Type:Article
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Publisher statement:This article has been published in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:08 July 2016
Date deposited:06 October 2016
Date of first online publication:13 July 2016
Date first made open access:06 October 2016

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