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Starburst and old population in z=3.8 radio galaxies with Pégase.3

Published online by Cambridge University Press:  17 July 2013

Brigitte Rocca-Volmerange
Affiliation:
Institut d' Astrophysique de Paris, UPMC/CNRS, 98bis Bd Arago, F-75014 Paris, France email: rocca@iap.fr
Guillaume Drouart
Affiliation:
Institut d' Astrophysique de Paris, UPMC/CNRS, 98bis Bd Arago, F-75014 Paris, France email: rocca@iap.fr European Southern Observatory, Karl Schwarzschild Strasse, 85748 Garching bei München, Germany
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Abstract

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Distant radio galaxies, hosted by massive ellipticals, follow the galaxy evolution process on an extremely large (0 ≥ z ≥7) time-scale ≥ 1012Gyrs, up to primeval galaxies. The new evolutionary code Pégase.3 predicts on similar time-scales, the coupled stellar and dust emissions of various galaxy types: starbursts and Hubble sequence types. All z=0 templates are fitted on local observations at ages ≃13 Gyrs (except irregulars at 9 Gyrs). The multi-λ spectral energy distributions (SEDs) of two z=3.8 radiogalaxies, including the most recent Herschel data from the HeRGÉ consortium, are interpreted in the observer's frame by Rocca-Volmerange et al. (2012) with Pégase.3. The apparent SEDs are fitted at best with the sum of a young starburst and an older early-type population, an AGN simple model is taken into account. These results favor massive gas-rich mergers at work in evolved galaxies at z≃4. Massive starbursts would be at the origin of galaxy evolution initiated at the earliest epochs (zfor≥10). The possible relation with super massive black holes is still debated.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2013 

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