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A VLBI Study of GHz-Peaked-Spectrum Radio Sources

Published online by Cambridge University Press:  25 May 2016

C. Stanghellini ,
C.P. O'DEA ,
S.A. Baum ,
D. Dallacasa ,
R. Fanti  and
C. Fanti
C. Stanghellini
Affiliation:
1Istituto di Radioastronomia CNR - Italy
C.P. O'DEA
Affiliation:
2STScI, Baltimore - USA
S.A. Baum
Affiliation:
2STScI, Baltimore - USA
D. Dallacasa
Affiliation:
1Istituto di Radioastronomia CNR - Italy
R. Fanti
Affiliation:
4University of Bologna - Italy
C. Fanti
Affiliation:
4University of Bologna - Italy

Extract

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The GHz-Peaked-Spectrum (GPS) radio sources are powerful (Lradio ≈ 1045 erg sec–1) and compact (10–100 mas, 10–1000 parsecs) sources characterized by a simple convex spectrum which peaks near 1 GHz (O'Dea et al. 1991 and references therein).

Optical and radio observations lead to the conclusion that GPS sources are formed when the radio source is confined to the narrow line region (or an even smaller scale) by a dense and clumpy medium. This could lead to 2 different evolutionary scenarios: as first suggested by Phillips and Mutel (1982) GPS radio sources could be classical double radio sources at the very first stage of their life, or alternatively they will never become as large as the classical doubles since the dense and turbulent environment is able to confine and trap the radio emitting region on the scale of the NLR (Baum et al. 1990).

Type
Properties of Radio Sources
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 67 - 68
Copyright
Copyright © Kluwer 1996 

References

Dallacasa, D., et al. 1995 Astron. Astrophys. , 295, 27.Google Scholar
Fanti, C., Fanti, R., Dallacasa, D., Schilizzi, R. T., Spencer, R. E., and Stanghellini, C., 1995, Astron. Astrophys. , 302, 317.Google Scholar
O'Dea, C.P., Baum, S.A., Stanghellini, C., 1991, Astrophys. J. , 380, 66 CrossRefGoogle Scholar
Readhead, A. C. S., et al. 1994, CERS meeting Google Scholar