Exploring the halo occupation of AGN using dark-matter cosmological simulations

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Georgakakis , A , Comparat , J , Merloni , A , Ciesla , L , Aird , J & Finoguenov , A 2019 , ' Exploring the halo occupation of AGN using dark-matter cosmological simulations ' , Monthly Notices of the Royal Astronomical Society , vol. 487 , no. 1 , pp. 275-295 . https://doi.org/10.1093/mnras/sty3454

Title: Exploring the halo occupation of AGN using dark-matter cosmological simulations
Author: Georgakakis, A.; Comparat, J.; Merloni, A.; Ciesla, L.; Aird, J.; Finoguenov, A.
Contributor: University of Helsinki, Department of Physics
Date: 2019-07
Language: eng
Number of pages: 21
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
URI: http://hdl.handle.net/10138/308472
Abstract: A semi-empirical model is presented that describes the distribution of active galactic nuclei (AGNs) on the cosmicweb. It populates dark-matter haloes in N-body simulations (MultiDark) with galaxy stellar masses using empirical relations based on abundance matching techniques, and then paints accretion events on these galaxies using state-of-the-art measurements of the AGN occupation of galaxies. The explicit assumption is that the large-scale distribution of AGN is independent of the physics of black hole fuelling. The model is shown to be consistent with current measurements of the two-point correlation function of AGN samples. It is then used to make inferences on the halo occupation of the AGN population. Mock AGNs are found in haloes with a broad distribution of masses with a mode of approximate to 10(12) h(-1) M-circle dot and a tail extending to cluster-size haloes. The clustering properties of the model AGN depend only weakly on accretion luminosity and redshift. The fraction of satellite AGN in the model increases steeply toward more massive haloes, in contrast with some recent observational results. This discrepancy, if confirmed, could point to a dependence of the halo occupation of AGN on the physics of black hole fuelling.
Subject: galaxies: active
galaxies: haloes
quasars: general
galaxies: Seyfert
X-rays: diffuse background
ACTIVE GALACTIC NUCLEI
DIGITAL SKY SURVEY
X-RAY AGN
ROSAT ALL-SKY
SPECTROSCOPIC TARGET SELECTION
SUPERMASSIVE BLACK-HOLES
GALAXY REDSHIFT SURVEY
STELLAR MASS
PHOTOMETRIC REDSHIFTS
STAR-FORMATION
115 Astronomy, Space science
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