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The Emission Line Properties of the 3CR Radio Galaxies at Redshift One: Shocks, Evolution, and the Alignment Effect

Published online by Cambridge University Press:  25 May 2016

Philip Best ,
Huub Röttgering  and
Malcolm Longair
Philip Best
Affiliation:
Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, The Netherlands
Huub Röttgering
Affiliation:
Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, The Netherlands
Malcolm Longair
Affiliation:
Cavendish Astrophysics, Madingley Road, Cambridge, CB3 0HE, UK

Abstract

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The results of a deep spectroscopic campaign on powerful radio galaxies with redshifts z ˜ 1, to investigate in detail their emission line gas properties, are presented. Both the 2-dimensional velocity structure of the [OII] 3727 emission line and the ionisation state of the gas are found to be strongly dependent upon the linear size (age) of the radio source in a manner indicative of the emission line properties of small (young) radio sources being dominated by the passage of the radio source shocks. The consequences of this evolution throughout the few x107 year lifetime of the radio source are discussed, particularly with relation to the alignment of the UV–optical continuum emission of these objects along their radio axis, the nature of which shows similar evolution.

Type
III. AGN Theory and Models
Information
Symposium - International Astronomical Union , Volume 194: Activity in Galaxies and Related Phenomena , 1999 , pp. 241 - 245
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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