AGN feedback causes downsizing

Evan Scannapieco, Joseph Silk, Rychard Bouwens

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

We study the impact of outflows driven by active galactic nuclei (AGNs) on galaxy formation. Outflows move into the surrounding intergalactic medium (IGM) and heat it sufficiently to prevent it from condensing onto galaxies. In the dense, high-redshift IGM, such feedback requires a highly energetic outflow, driven by a large AGN. However, in the more tenuous low-redshift IGM, equivalently strong feedback can be achieved by less energetic winds (and thus smaller galaxies). Using a simple analytic model, we show that this leads to the antihierarchical quenching of star formation in large galaxies, consistent with current observations. At redshifts prior to the formation of large AGNs, galaxy formation is hierarchical and follows the growth of dark matter halos. The transition between the two regimes lies at the z ≈ 2 peak of AGN activity.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume635
Issue number1 II
DOIs
StatePublished - Dec 10 2005
Externally publishedYes

Fingerprint

active galactic nuclei
intergalactic media
outflow
causes
galactic evolution
energetics
galaxies
condensing
star formation
halos
dark matter
quenching
heat

Keywords

  • Galaxies: evolution
  • Large-scale structure of universe
  • Quasars: general

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

AGN feedback causes downsizing. / Scannapieco, Evan; Silk, Joseph; Bouwens, Rychard.

In: Astrophysical Journal, Vol. 635, No. 1 II, 10.12.2005.

Research output: Contribution to journalArticle

Scannapieco, Evan ; Silk, Joseph ; Bouwens, Rychard. / AGN feedback causes downsizing. In: Astrophysical Journal. 2005 ; Vol. 635, No. 1 II.
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