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Optical and UV Spectral Diagnostics for GPS and CSS Sources

Published online by Cambridge University Press:  05 March 2013

Michael A. Dopita
Michael A. Dopita*
Affiliation:
Research School of Astronomy and Astrophysics, Australian National University, Cotter Rd, Weston, ACT 2611, Australia. Michael.Dopita@anu.edu.au
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Abstract

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In this paper I examine the use of optical and UV spectral diagnostic ratios to distinguish between gas which is locally shock-excited by the interaction with a jet and that which is photoionised by the central engine. In many cases key UV lines remain unobserved except in the case of high redshift radio galaxies. However, in one case, the nearby GPS galaxy NGC1052, UV data was obtained with the FOS. This object shows LINER characteristics at optical wavelengths, but has a rich coronal-line spectrum in the UV. We conclude that jet-driven shocks tend to evolve from shock-excited to photoionised later in their evolution.

Keywords

galaxies: radio sourcesISM: shocks, photoionisation
Type
GPS/CSS Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 1 , 2003 , pp. 31 - 34
Copyright
Copyright © Astronomical Society of Australia 2003

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