AGN Feedback Causes Downsizing

Details AGN Feedback Causes Downsizing AGN Feedback Causes Downsizing

2005-11-03

arxiv.org/abs/astro-ph/0511116v1

Astrophys.J.635:L13-L16,2005

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures, ApJL in press

Scientific paper

10.1086/499271

We study the impact of outflows driven by active galactic nuclei (AGN) 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 highly energetic outflows, 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 anti-hierarchical quenching of star-formation in large galaxies, consistent with current observations. At redshifts prior to the formation of large AGN, 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.

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