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Revealing AGN, young and old stellar populations in HzRGs with PEGASE.3

Published online by Cambridge University Press:  25 July 2014

Guillaume Drouart ,
Carlos De Breuck ,
Joël Vernet ,
Brigitte Rocca Volmerange  and
Nicholas Seymour
Guillaume Drouart
Affiliation:
ESO, Karl Schwarzschild Straße 2, 85748 Garching bei München, Germany Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France CSIRO Astronomy & Space Science, PO Box 76, Epping, NSW 1710, Australia email: drouart@iap.fr
Carlos De Breuck
Affiliation:
ESO, Karl Schwarzschild Straße 2, 85748 Garching bei München, Germany
Joël Vernet
Affiliation:
ESO, Karl Schwarzschild Straße 2, 85748 Garching bei München, Germany
Brigitte Rocca Volmerange
Affiliation:
Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France
Nicholas Seymour
Affiliation:
CSIRO Astronomy & Space Science, PO Box 76, Epping, NSW 1710, Australia email: drouart@iap.fr
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Abstract

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The HeRGÉ (Herschel Radio Galaxy Evolution) project consists of a sample of 70 radio galaxies in the range 1 < z < 5.2. They benefit from continuous coverage from 3 to 870μm with Spitzer, Herschel and sub-mm ground-based instruments (SCUBA, LABOCA). As a calorimeter, IR is an excellent proxy to estimate the contribution of both AGN and starburst, making of radio galaxies perfect candidates to provide new insights into the relationship between AGN and their host galaxies. The IR SED fitting with empirical templates reveals that radio galaxies are luminous and that their black holes and their host galaxies are not growing simultaneously. Extending the SED to optical/near-IR on a subsample of 12 radio galaxies spanning 1 < z < 4 reveal the necessity of three components to reproduce the observations. Making use of the evolutionary code PEGASE.3 and an AGN torus model, we are able to estimate parameters from the AGN torus, the evolved stellar population and the starburst (SB). They reveal that radio galaxies are massive, evolved, forming the bulk of their mass at very high redshift in a short timescale, but experience episodic, strong SB events, often associated with an AGN activity.

Keywords

Galaxies: high redshiftactiveevolutionstellar content – Infrared: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S304: Multiwavelength AGN Surveys and Studies , October 2013 , pp. 307 - 310
Copyright
Copyright © International Astronomical Union 2014 

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