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Shock Excitation of Emission Lines and the Relation to GPS Sources

  • G.V. Bicknell (a1), M.A. Dopita (a2) and C.P. O'DEA (a3)

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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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Begelman, M. C.: 1995, in Harris, D.A. (ed.), Cygnus A.
Dopita, M. A. and Sutherland, R. S.: 1995, ApJ , in press
Scheuer, P. A. G.: 1982, in Heeschen, D. S. and Wade, C. M. (eds.), IAU Symposium 97, Extragalactic Radio Sources , p. 163, Reidel, Dordrecht
Stanghellini, C., O'Dea, C., and Baum, S.: 1995, in preparation
Sutherland, R. S. and Dopita, M. A.: 1993, ApJS 88, 253

Shock Excitation of Emission Lines and the Relation to GPS Sources

  • G.V. Bicknell (a1), M.A. Dopita (a2) and C.P. O'DEA (a3)

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