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Shock Excitation of Emission Lines and the Relation to GPS Sources

Published online by Cambridge University Press:  25 May 2016

G.V. Bicknell ,
M.A. Dopita  and
C.P. O'DEA
G.V. Bicknell
Affiliation:
1 Astrophysical Theory Centre, ANU, Canberra, ACT 0200, Australia
M.A. Dopita
Affiliation:
2 Mt. Stromlo & Siding Spring Observatories, Weston PO, ACT 2611, Australia
C.P. O'DEA
Affiliation:
3 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore MD, 21218, USA

Extract

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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.

Type
Radio Source Modelling and Emission Mechanisms
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 469 - 470
Copyright
Copyright © Kluwer 1996 

References

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