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Giant Radio Galaxies and the Inter Galactic Medium

Published online by Cambridge University Press:  26 May 2016

Arno P. Schoenmakers ,
A.G. de Bruyn ,
H.J.A. Röttgering  and
H. van der Laan
Arno P. Schoenmakers
Affiliation:
N.F.R.A., P.O. Box 2, 7990-AA, Dwingeloo, The Netherlands, Astronomical Institute Utrecht, P.O. Box 80000, 3508-TA Utrecht, and Sterrewacht Leiden, P. 0. Box 9500, 2300-RA Leiden, The Netherlands
A.G. de Bruyn
Affiliation:
N.F.R.A., P.O. Box 2, 7990-AA, Dwingeloo, The Netherlands, and Kapteyn Astronomical Institute, P.O. Box 900, 9700-AV, Groningen, The Netherlands
H.J.A. Röttgering
Affiliation:
Sterrewacht Leiden, P.O. Box 9500, 2300-RA Leiden, The Netherlands
H. van der Laan
Affiliation:
Astronomical Institute Utrecht, P.O. Box 80000, 3508-TA Utrecht, The Netherlands

Abstract

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Using the WENSS survey, we have selected a complete sample of 26 Giant Radio Galaxies. We have investigated the properties of their radio structures using multifrequency radio observations. A spectral ageing analisys reveals that, among other things, that these sources are typically 50 — 100 Myr old and that their lobes have higher advance velocities than smaller sources of similar radio power. Further, we find pressure gradients in their radio lobes, suggesting that the lobes are still overpressured with respect to the environment. We find no evidence for a cosmological evolution of the radio lobe pressures with increasing redshift, at least up to z ∼ 0.3, other than that caused by our selection technique. A faint, higher redshift sample of giant sources is needed to constrain the pressure in their environments, the IGM. We are well underway with selecting such a sample, and the GMRT can play an important role in studying the radio properties of these sources.

Type
Part 4: Extragalactic Radio Sources
Information
Symposium - International Astronomical Union , Volume 199: The Universe at Low Radio Frequencies , 2002 , pp. 195 - 198
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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