Eddington ratio and accretion efficiency in active galactic nuclei evolution
Eddington ratio and accretion efficiency in active galactic nuclei evolution
The cosmological evolution of active galactic nuclei (AGN) is important for understanding the mechanism of accretion on to supermassive black holes and the related evolution of the host galaxy. In this work, we include objects with very low Eddington ratio (10-3-10-2) in an evolution scenario, and compare the results with the observed local distribution of black holes. We test several possibilities for the AGN population, considering obscuration and dependence with luminosity, and investigate the role of the Eddington ratio λ and radiative accretion efficiency ε on the shape of the evolved mass function. We find that three distinct populations of AGN can evolve with a wider parameter range than is usually considered, and still be consistent with the local mass function. In general, the black holes in our solutions are spinning rapidly. Taking fixed values for ε and λ neither provides a full knowledge of the evolution mechanism nor is consistent with the existence of low-Eddington-ratio objects.
Black hole physics, Galaxies: active, Galaxies: nuclei, Quasars: general
1217-1221
Raimundo, S. I.
e409d9d3-17e8-4049-ad29-43ada60b24e2
Fabian, A. C.
b9bef0bc-2ecd-49dc-ab2b-954cabea88ba
16 July 2009
Raimundo, S. I.
e409d9d3-17e8-4049-ad29-43ada60b24e2
Fabian, A. C.
b9bef0bc-2ecd-49dc-ab2b-954cabea88ba
Raimundo, S. I. and Fabian, A. C.
(2009)
Eddington ratio and accretion efficiency in active galactic nuclei evolution.
Monthly Notices Of The Royal Astronomical Society, 396 (3), .
(doi:10.1111/j.1365-2966.2009.14796.x).
Abstract
The cosmological evolution of active galactic nuclei (AGN) is important for understanding the mechanism of accretion on to supermassive black holes and the related evolution of the host galaxy. In this work, we include objects with very low Eddington ratio (10-3-10-2) in an evolution scenario, and compare the results with the observed local distribution of black holes. We test several possibilities for the AGN population, considering obscuration and dependence with luminosity, and investigate the role of the Eddington ratio λ and radiative accretion efficiency ε on the shape of the evolved mass function. We find that three distinct populations of AGN can evolve with a wider parameter range than is usually considered, and still be consistent with the local mass function. In general, the black holes in our solutions are spinning rapidly. Taking fixed values for ε and λ neither provides a full knowledge of the evolution mechanism nor is consistent with the existence of low-Eddington-ratio objects.
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Accepted/In Press date: 19 March 2009
Published date: 16 July 2009
Keywords:
Black hole physics, Galaxies: active, Galaxies: nuclei, Quasars: general
Identifiers
Local EPrints ID: 475888
URI: http://eprints.soton.ac.uk/id/eprint/475888
ISSN: 1365-2966
PURE UUID: 096f3548-6fe2-463e-8315-02300d1daf63
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Date deposited: 29 Mar 2023 17:13
Last modified: 17 Mar 2024 04:03
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Author:
A. C. Fabian
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