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

Georgakakis, A., Comparat, J., Merloni, A., Ciesla, L., Aird, J., & Finoguenov, A. (2018). Exploring the halo occupation of AGN using dark-matter cosmological simulations. Monthly Notices of the Royal Astronomical Society, 487(1), 275-295. doi:10.1093/mnras/sty3454.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-E4C7-A Version Permalink: http://hdl.handle.net/21.11116/0000-0004-E4C8-9
Genre: Journal Article

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Georgakakis, A., Author
Comparat, J.1, Author              
Merloni, A.1, Author              
Ciesla, L., Author
Aird, J., Author
Finoguenov, A.1, Author              
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1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: A semi-empirical model is presented that describes the distribution of active galactic nuclei (AGNs) on the cosmic web. 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 ≈1012h−1M 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.

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 Dates: 2018-12-20
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/sty3454
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 487 (1) Sequence Number: - Start / End Page: 275 - 295 Identifier: ISSN: 1365-2966
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150