Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/45645
Title: Exploring the halo occupation of AGN using dark-matter cosmological simulations
Authors: Georgakakis, A
Comparat, J
Merloni, A
Ciesla, L
Aird, J
Finoguenov, A
First Published: 20-Dec-2018
Publisher: Oxford University Press (OUP), Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2019, 487(1), pp. 275–295
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 ≈1012 h−1 M 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.
DOI Link: 10.1093/mnras/sty3454
eISSN: 1365-2966
Links: https://academic.oup.com/mnras/article/487/1/275/5255204
http://hdl.handle.net/2381/45645
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2018, Oxford University Press (OUP), Royal Astronomical Society. Deposited with reference to the publisher’s open access archiving policy. (http://www.rioxx.net/licenses/all-rights-reserved)
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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