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dc.contributor.authorKrishnan, Charutha
dc.contributor.authorAlmaini, Omar
dc.contributor.authorHatch, Nina A.
dc.contributor.authorWilkinson, Aaron
dc.contributor.authorMaltby, David T.
dc.contributor.authorConselice, Christopher J.
dc.contributor.authorKocevski, Dale
dc.contributor.authorSuh, Hyewon
dc.contributor.authorWild, Vivienne
dc.identifier.citationKrishnan , C , Almaini , O , Hatch , N A , Wilkinson , A , Maltby , D T , Conselice , C J , Kocevski , D , Suh , H & Wild , V 2020 , ' The clustering of X-ray AGN at 0.5 < z < 4.5 : host galaxies dictate dark matter halo mass ' , Monthly Notices of the Royal Astronomical Society , vol. 494 , no. 2 , pp. 1693-1704 .
dc.identifier.otherPURE: 269755709
dc.identifier.otherPURE UUID: c4504ae3-951f-489c-b9ab-23a42839e61a
dc.identifier.otherBibCode: 2020MNRAS.494.1693K
dc.identifier.otherWOS: 000535877200012
dc.identifier.otherScopus: 85087974470
dc.description.abstractWe present evidence that active galactic nuclei (AGN) do not reside in 'special' environments, but instead show large-scale clustering determined by the properties of their host galaxies. Our study is based on an angular cross-correlation analysis applied to X-ray selected AGN in the COSMOS and UDS fields, spanning redshifts from z ∼ 4.5 to z ∼ 0.5. Consistent with previous studies, we find that AGN at all epochs are on average hosted by galaxies in dark matter haloes of 1012-1013 M⊙, intermediate between star-forming and passive galaxies. We find, however, that the same clustering signal can be produced by inactive (I.e. non-AGN) galaxies closely matched to the AGN in spectral class, stellar mass, and redshift. We therefore argue that the inferred bias for AGN lies in between the star-forming and passive galaxy populations because AGN host galaxies are comprised of a mixture of the two populations. Although AGN hosted by higher mass galaxies are more clustered than lower mass galaxies, this stellar mass dependence disappears when passive host galaxies are removed. The strength of clustering is also largely independent of AGN X-ray luminosity. We conclude that the most important property that determines the clustering in a given AGN population is the fraction of passive host galaxies. We also infer that AGN luminosity is likely not driven by environmental triggering, and further hypothesize that AGN may be a stochastic phenomenon without a strong dependence onenvironment.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.rightsCopyright © 2020 the Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectGalaxies: activeen
dc.subjectGalaxies: evolutionen
dc.subjectGalaxies: haloesen
dc.subjectLarge-scale structure of Universeen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleThe clustering of X-ray AGN at 0.5 < z < 4.5 : host galaxies dictate dark matter halo massen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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