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Constraining the Evolution of Young Radio-Loud AGN

Published online by Cambridge University Press:  05 March 2013

I. A. G. Snellen ,
K.-H. Mack ,
R. T. Schilizzi  and
W. Tschager
I. A. G. Snellen
Affiliation:
Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK. [email protected]
K.-H. Mack
Affiliation:
ASTRON/NFRA, Postbus 2, NL-7990 AA Dwingeloo, The Netherlands. Istituto di Radioastronomia de CNR, Via Gobetti 101, I-40129 Bologna, Italy. Radioastronomisches Institut der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany. [email protected]
R. T. Schilizzi
Affiliation:
Joint Institute for VLBI in Europe, Postbus 2, NL-7990 AA, Dwingeloo, The Netherlands. [email protected] Leiden Observatory, P.O. Box 9513, NL-2300 RA, Leiden, The Netherlands. [email protected]
W. Tschager
Affiliation:
Leiden Observatory, P.O. Box 9513, NL-2300 RA, Leiden, The Netherlands. [email protected]
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Abstract

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GPS and CSS radio sources are the objects of choice to investigate the evolution of young radio-loud AGN. Previous investigations, mainly based on number counts and source size distributions, indicate that GPS/CSS sources decrease significantly in radio power when evolving into old, extended objects. We suggest this is preceded by a period of increase in radio luminosity, which lasts as long as the radio source is confined within the core-radius of its host galaxy. We have selected a sample of nearby compact radio sources, unbiased by radio spectrum, to determine their luminosity function, size distribution, dynamical ages, and emission line properties in a complete and homogeneous way. First results indicate that the large majority of objects (>80%) exhibit classical GPS/CSS radio spectra, and show structures consistent with them being compact double or compact symmetric objects. This sample provides an ideal basis to further test and constrain possible evolution scenarios, and to investigate the relation between radio spectra and morphologies, orientation and Doppler boosting in samples of young radio-loud AGN, in an unbiased way.

Keywords

galaxies: activegalaxies: jetsradio continuum: galaxies
Type
GPS/CSS Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 1 , 2003 , pp. 38 - 41
Copyright
Copyright © Astronomical Society of Australia 2003

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