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

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

Resultado de la investigación: Article

4 Citas (Scopus)

Resumen

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 L HX ≥ 10 42 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, t on/t 30, where t 30 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 L HX ≥ 10 42 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.

Idioma originalEnglish
Páginas (desde-hasta)2712-2720
Número de páginas9
PublicaciónMonthly Notices of the Royal Astronomical Society
Volumen483
N.º2
DOI
EstadoPublished - 1 ene 2019

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

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. En: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 483, N.º 2. pp. 2712-2720.
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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 L HX ≥ 10 42 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, t on/t 30, where t 30 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 L HX ≥ 10 42 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.",
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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.

En: Monthly Notices of the Royal Astronomical Society, Vol. 483, N.º 2, 01.01.2019, p. 2712-2720.

Resultado de la investigación: Article

TY - JOUR

T1 - The abundances and properties of Dual AGN and their host galaxies in the EAGLE simulations

AU - Rosas-Guevara, Yetli M.

AU - Bower, Richard G.

AU - McAlpine, Stuart

AU - Bonoli, Silvia

AU - Tissera, Patricia B.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - 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 L HX ≥ 10 42 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, t on/t 30, where t 30 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 L HX ≥ 10 42 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.

AB - 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 L HX ≥ 10 42 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, t on/t 30, where t 30 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 L HX ≥ 10 42 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.

KW - Galaxies: active

KW - Methods: numerical

KW - Quasars: supermassive black holes

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -