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Massive galaxies with very young AGN

Published online by Cambridge University Press:  01 July 2007

Nathan de Vries ,
I. A. G. Snellen ,
R. T. Schilizzi ,
M. D. Lehnert  and
M. N. Bremer
Nathan de Vries
Affiliation:
Leiden Observatory, Leiden University, PO Box 9513, 2300 RA, Leiden, The Netherlands email: [email protected]
I. A. G. Snellen
Affiliation:
Leiden Observatory, Leiden University, PO Box 9513, 2300 RA, Leiden, The Netherlands email: [email protected]
R. T. Schilizzi
Affiliation:
Leiden Observatory, Leiden University, PO Box 9513, 2300 RA, Leiden, The Netherlands email: [email protected] International SKA Project office, PO Box 2, 7990 AA, Dwingeloo, The Netherlands
M. D. Lehnert
Affiliation:
GEPI, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France
M. N. Bremer
Affiliation:
Department of Physics, Bristol University, Tyndall Avenue, Bristol BS8 1TL, UK
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Abstract

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Gigahertz Peaked Spectrum (GPS) radio galaxies are generally thought to be the young counterparts of classical extended radio sources and live in massive ellipticals. GPS sources are vital for studying the early evolution of radio-loud AGN, the trigger of their nuclear activity, and the importance of feedback in galaxy evolution. We study the Parkes half-Jansky sample of GPS radio galaxies of which now all host galaxies have been identified and 80% has their redshifts determined (0.122 < z < 1.539). Analysis of the absolute magnitudes of the GPS host galaxies show that at z > 1 they are on average a magnitude fainter than classical 3C radio galaxies. This suggests that the AGN in young radio galaxies have not yet much influenced the overall properties of the host galaxy. However their restframe UV luminosities indicate that there is a low level of excess as compared to passive evolution models.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 261 - 262
Copyright
Copyright © International Astronomical Union 2008

References

de Vries, N., Snellen, I.A.G., Schilizzi, R.T., Lehnert, M.D., Bremer, M.N., 2007, A&A 464, 879Google Scholar
Eisenstein, D.J. et al. , 2001, AJ, 122, 2267CrossRefGoogle Scholar
Snellen, I.A.G., Lehnert, M.D., Bremer, M.N., Schilizzi, R.T., 2002, MNRAS, 337, 981Google Scholar