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The abundances and properties of Dual AGN and their host galaxies in the EAGLE simulations

Rosas-Guevara, Yetli M; Bower, Richard G; McAlpine, Stuart; Bonoli, Silvia; Tissera, Patricia B

The abundances and properties of Dual AGN and their host galaxies in the EAGLE simulations Thumbnail


Authors

Yetli M Rosas-Guevara

Richard G Bower

Stuart McAlpine

Silvia Bonoli

Patricia B Tissera



Abstract

We look into the abundance of Dual AGN (active galactic nucleus) in the largest hydrodynamical simulation from the Evolution and Assembly of GaLaxies and their Environment (EAGLE) project. We define a Dual AGN as two active black holes (BHs) with a separation below 30 kpc. We find that only 1 per cent of AGN with LHX ≥ 1042 erg s−1 are part of a Dual AGN system at z = 0.8–1. During the evolution of a typical binary BH system, the rapid variability of the hard X-ray luminosity on Myr time-scales severely limits the detectability of Dual AGN. To quantify this effect, we calculate a probability of detection, ton/t30, where t30 is the time in which the two BHs are separated at distances below 30 kpc and ton, the time that both AGNs are visible (e.g. when both AGNs have LHX ≥ 1042 erg s−1) in this period. We find that the average fraction of visible Dual systems is 3 per cent. The visible Dual AGN distribution as a function of BH separation presents a pronounced peak at ∼20 kpc that can be understood as a result of the rapid orbital decay of the host galaxies after their first encounter. We also find that 75 per cent of the host galaxies have recently undergone or are undergoing a merger with stellar mass ratio ≥0.1. Finally, we find that the fraction of visible Dual AGN increases with redshift as found in observations.

Citation

Rosas-Guevara, Y. M., Bower, R. G., McAlpine, S., Bonoli, S., & Tissera, P. B. (2019). The abundances and properties of Dual AGN and their host galaxies in the EAGLE simulations. Monthly Notices of the Royal Astronomical Society, 483(2), 2712-2720. https://doi.org/10.1093/mnras/sty3251

Journal Article Type Article
Acceptance Date Nov 23, 2019
Online Publication Date Nov 30, 2018
Publication Date Feb 21, 2019
Deposit Date Mar 12, 2019
Publicly Available Date Mar 12, 2019
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 483
Issue 2
Pages 2712-2720
DOI https://doi.org/10.1093/mnras/sty3251
Public URL https://durham-repository.worktribe.com/output/1301313

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Copyright Statement
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.






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