The rise of active galactic nuclei in the galaxy evolution and assembly semi-analytic model

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    Final published version, 2.29 MB, PDF document

  • Fabio Fontanot
  • Gabriella De Lucia
  • Hirschmann, Michaela Monika
  • Lizhi Xie
  • Pierluigi Monaco
  • Nicola Menci
  • Fabrizio Fiore
  • Chiara Feruglio
  • Stefano Cristiani
  • Francesco Shankar

We present a new implementation of the GAlaxy Evolution and Assembly (GAEA) semianalytic model, that features an improved modelling of the process of cold gas accretion on to supermassive black hole (SMBHs), derived from both analytic arguments and high-resolution simulations. We consider different scenarios for the loss of angular momentum required for the available cold gas to be accreted on to the central SMBHs, and we compare different combinations of triggering mechanisms, including galaxy mergers and disc instabilities in star-forming discs. We compare our predictions with the luminosity function (LF) observed for active galactic nuclei (AGNs) and we confirm that a non-instantaneous accretion time-scale (either in the form of a low-angular momentum reservoir or as an assumed light-curve evolution) is needed in order to reproduce the measured evolution of the AGN-LF and the so-called AGN-downsizing trend. Moreover, we also study the impact of AGN feedback, in the form of AGN-driven outflows, on the SF properties of model galaxies, using prescriptions derived both from empirical studies and from numerical experiments. We show that AGN-driven outflows are effective in suppressing the residual star formation rate in massive galaxies (>10(11)M(circle dot)) without changing their overall assembly history. These winds also affect the SFR of lower mass galaxies, resulting in a too large fraction of passive galaxies at

Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume496
Issue number3
Pages (from-to)3943-3960
Number of pages18
ISSN0035-8711
DOIs
Publication statusPublished - 17 Jun 2020

    Research areas

  • galaxies: active, galaxies: evolution, galaxies: formation, galaxies: fundamental parameters, SUPERMASSIVE BLACK-HOLES, STAR-FORMATION, HIERARCHICAL-MODELS, SCALING RELATIONS, STELLAR FEEDBACK, METAL ENRICHMENT, ANGULAR-MOMENTUM, AGN FEEDBACK, SIMULATIONS, GROWTH

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