Radio source feedback in galaxy evolution

Details Radio source feedback in galaxy evolution Radio source feedback in galaxy evolution

2009-05-11

arxiv.org/abs/0905.1578v1

Astrophys.J.699:525-538,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

37 pages, 14 figures, ApJ (in press)

Scientific paper

10.1088/0004-637X/699/1/525

We present a galaxy evolution model which incorporates a physically motivated implementation of AGN feedback. Intermittent jets inflate cocoons of radio plasma which then expand supersonically, shock heating the ambient gas. The model reproduces observed star formation histories to the highest redshifts for which reliable data exists, as well as the observed galaxy colour bimodality. Intermittent radio source feedback also naturally provides a way of keeping the black hole and spheroid growth in step. We find possible evidence for a top-heavy Initial Mass Function (IMF) for $z>2$, consistent with observations of element abundances, and sub-mm and Lyman break galaxy counts.

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