Colloquium on 17 July 2014
Rapidly growing black holes and host galaxies in the distant Universe

Details

Title: Rapidly growing black holes and host galaxies in the distant Universe
Speaker: Dr. Guillaume Drouart (Onsala Space Observatory)
Date: Thursday, 17 July 2014
Time: 11:00 - 12:00
Venue: SAAO Auditorium

Abstract

Powerful high redshift radio galaxies (HzRGs) exihibit strong AGN and star formation activities making them ideal candidates to gain insights into the so-called AGN-SF connection. Thanks to the HeRGE project, a comprehensive survey of 70 HzRGs covering the 3 – 870 um range, we are able to disentangle the IR SED into a AGN and a starburst (SB) component. This suggests that the supermassive black holes may be out growing or have outgrown their host galaxies when compared to the local M_BH-M_Gal relation. Extending the SED to the optical for a subsample of 12 HzRGs and
making use of a AGN torus model and the PEGASE evolutionary code, we show that three components are necessary to reproduce the observed SED: a AGN, an evolved stellar population and a starburst. If HzRGs have formed the bulk of their stars at very high redshift  (evolved component), they are still experiencing intense star forming episodes representing a significant fraction of the total mass of the system.

Please note

Speaker is visiting Tom Jarrett
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