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        Triggering Active Galactic Nuclei in galaxy clusters

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        Marshall_et_al_Published_Version.pdf (PDF, 3Mb)
        Author
        Marshall, Madeline A.
        Shabala, Stanislav
        Krause, Martin G. H.
        Pimbblet, Kevin A.
        Croton, Darren J.
        Owers, Matt S.
        Attention
        2299/20073
        Abstract
        We model the triggering of active galactic nuclei (AGN) in galaxy clusters using the semianalytic galaxy formation model SAGE. We prescribe triggering methods based on the ram pressure galaxies experience as they move throughout the intracluster medium, which is hypothesized to trigger star formation and AGN activity. The clustercentric radius and velocity distribution of the simulated active galaxies produced by thesemodels are compared with those of AGN and galaxies with intense star formation from a sample of low-redshift relaxed clusters from the Sloan Digital Sky Survey. The ram pressure triggering model that best explains the clustercentric radius and velocity distribution of these observed galaxies has AGN and star formation triggered if 2.5 × 10 -14 Pa < P ram < 2.5 × 10 -13 Pa and P ram > 2P internal; this is consistent with expectations from hydrodynamical simulations of ram-pressure-induced star formation. Our results show that ram pressure is likely to be an important mechanism for triggering star formation and AGN activity in clusters.
        Publication date
        2018-03-01
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stx2996
        Other links
        http://hdl.handle.net/2299/20073
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