The Impact of Outflows Driven by Active Galactic Nuclei on Metals in and around Galaxies

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Metals in the hot gaseous halos of galaxies encode the history of star formation as well as the feedback processes that eject metals from the galaxies. X-ray observations suggest that massive galaxies have extended distributions of metals in their gas halos. We present predictions for the metal properties of massive galaxies and their gaseous halos from recent high-resolution zoom-in simulations that include mechanical and radiation-driven feedback from active galactic nuclei (AGN). In these simulations, AGN launch high-velocity outflows, mimicking observed broad absorption line winds. By comparing two sets of simulations with and without AGN feedback, we show that our prescription for AGN feedback is capable of driving winds and enriching halo gas "inside-out" by spreading centrally enriched metals to the outskirts of galaxies, into the halo and beyond. The metal (iron) profiles of halos simulated with AGN feedback have a flatter slope than those without AGN feedback, consistent with recent X-ray observations. The predicted gas iron abundance of group scale galaxies simulated with AGN feedback is Z(Fe) = 0.23 Z(Fe,) at 0.5r(500), which is 2.5 times higher than that in simulations without AGN feedback. In these simulations, AGN winds are also important for the metal enrichment of the intergalactic medium, as the vast majority of metals ejected from the galaxy by AGN-driven winds end up beyond the halo virial radius.

Original languageEnglish
Article number8
JournalAstrophysical Journal
Volume904
Issue number1
Number of pages12
ISSN0004-637X
DOIs
Publication statusPublished - 17 Nov 2020

    Research areas

  • Active galactic nuclei, Galactic winds, Chemical enrichment, Galaxy chemical evolution, Galaxy evolution, SMOOTHED PARTICLE HYDRODYNAMICS, SUPERMASSIVE BLACK-HOLES, STAR-FORMATION HISTORIES, MECHANICAL AGN FEEDBACK, COSMOLOGICAL SIMULATIONS, REALISTIC POPULATION, INTRACLUSTER MEDIUM, RADIATIVE FEEDBACK, DISC GALAXY, RADIO JETS

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