Abstract
Gigahertz Peak Spectrum (GPS) and Compact Steep Spectrum (CSS) sources have attracted a large amount of attention in recent years since they occupy a surprisingly large fraction of the extragalactic radio source population. In this paper we summarise a theory which attempts to unify the optical emission line and radio properties of these sources. In outline the theory is as follows: The bow shock preceding the radio lobe driven into the ISM by a powerful radio jet ionizes the ISM producing both optical line emission and a free-free absorbing screen. The free-free absorption can explain the relationship between size and turnover frequency (Stanghellini et al., 1995) and the prediction of the line emission is in accord with the observation for a small sample of sources for which optical data are available.
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References
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© 1996 International Astronomical Union
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Bicknell, G.V., Dopita, M.A., O’dea, C.P. (1996). Shock Excitation of Emission Lines and the Relation to GPS Sources. In: Ekers, R., Fanti, C., Padrielli, L. (eds) Extragalactic Radio Sources. International Astronomical Union, vol 175. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0295-4_169
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DOI: https://doi.org/10.1007/978-94-009-0295-4_169
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