NIHAO - XXVIII. Collateral effects of AGN on dark matter concentration and stellar kinematics

Stefan Waterval, Sana Elgamal, Matteo Nori, Mario Pasquato, Andrea V. MacCiò, Marvin Blank, Keri L. Dixon, Xi Kang, Tengiz Ibrayev

Research output: Contribution to journalArticlepeer-review


Although active galactic nuclei (AGN) feedback is required in simulations of galaxies to regulate star formation, further downstream effects on the dark matter (DM) distribution of the halo and stellar kinematics of the central galaxy can be expected. We combine simulations of galaxies with and without AGN physics from the Numerical Investigation of a Hundred Astrophysical Objects (NIHAO) to investigate the effect of AGN on the DM profile and central stellar rotation of the host galaxies. Specifically, we study how the concentration-halo mass (c-M) relation and the stellar spin parameter (λR) are affected by AGN feedback. We find that AGN physics is crucial to reduce the central density of simulated massive (≥1012 M⊙) galaxies and bring their concentration to agreement with results from the Spitzer Photometry & Accurate Rotation Curves (SPARC) sample. Similarly, AGN feedback has a key role in reproducing the dichotomy between slow and fast rotators as observed by the ATLAS3D survey. Without star formation suppression due to AGN feedback, the number of fast rotators strongly exceeds the observational constraints. Our study shows that there are several collateral effects that support the importance of AGN feedback in galaxy formation, and these effects can be used to constrain its implementation in numerical simulations.

Original languageEnglish (US)
Pages (from-to)5307-5319
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - Aug 1 2022


  • galaxies: evolution
  • galaxies: formation
  • methods: numerical
  • methods: statistical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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