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Variable Radio Sources

Published online by Cambridge University Press:  14 August 2015

R. Fanti ,
L. Padrielli  and
M. Salvati
R. Fanti
Affiliation:
Istituto di Fisica and Istituto di Radioastronomia, Pologna
L. Padrielli
Affiliation:
Istituto di Fisica and Istituto di Radioastronomia, Pologna
M. Salvati
Affiliation:
Istituto di Astrofisica Spaziale, Frascati

Extract

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Flux variations are a common feature of flat spectrum compact extra-galactic radio sources. Detailed analysis and quantitative comparisons with theoretical models (e.g. van der Laan, 1966) are difficult due to the complex characteristics of the flux variations, which generally appear to consist of different outbursts blended together in time. Nevertheless, the general consensus is that the basic process has been correctly identified and consists in an expansion of a synchrotron radiating plasma cloud of relativistic electrons and magnetic field partially opaque to its own radiation. The main differences between data and predictions of the theory are that the variations propagate too fast and with too large amplitude toward lower frequencies. This behaviour however may be indicative of continuous energy supply and consequent accelerated expansion.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 97: Extragalactic Radio Sources , 1982 , pp. 317 - 324
Copyright
Copyright © Reidel 1982 

References

Blanford, R.D., and Mc Kee, C.F., M.N.R.A.S., 180, 343 Google Scholar
Blanford, R.D., and Konigl, A., 1979, Astrophys. J., 232, 34 Google Scholar
Cocke, W.J., and Pacholczyk, A.G., 1975, Astrophys. J., 195, 279 Google Scholar
Cocke, W. J., et al., 1978, Astrophys. J., 226, 26 Google Scholar
Cohen, M.H., et al., 1977, Nature, 268, 405 CrossRefGoogle Scholar
Condon, J.J., et al., 1979, Astron. J., 84, 1 Google Scholar
Cotton, W.D., 1976, Astrophys. J., 204, L63 CrossRefGoogle Scholar
Cotton, W.D. and Spangler, S.R., 1978, Astrophys. J., 228, L63 Google Scholar
Dennison, B., and Condon, J.J., 1981, Astrophys. J., 246, 91 Google Scholar
Fanti, R., et al., 1979, Astron. Astrophys. Suppl., 36, 359 Google Scholar
Fanti, R., et al., 1981, Astron. Astrophys. Suppl., 45, 61 Google Scholar
Fanti, R., and Salvati, M., 1980, Proc. 5th europ. meeting astron., Liège Google Scholar
Fisher, J.R., and Erickson, W.C., 1981, Astrophys. J., 242, 884 Google Scholar
Jones, T.W., and Tobin, W., 1977, Astrophys. J., 215, 474 Google Scholar
van der Laan, H., 1966, Nature, 211, 1131 Google Scholar
Marscher, A.P., 1979, Astrophys. J., 228, 27 Google Scholar
Marscher, A.P., et al., 1979, Astrophys. J., 233, 498 CrossRefGoogle Scholar
Mc Adam, W.B., 1978, Proc. Astron. Soc. Austral., 3, 283 Google Scholar
Mc Adam, W.B., 1979, Proc. Astron. Soc. Austral., in press Google Scholar
Mc Adam, W.B., 1980, Proc. Astron. Soc. Austral., in press Google Scholar
Readhead, A.C.S. et al., 1977, Astrophys. J. 215, L13 CrossRefGoogle Scholar
Scheuer, P.A.G., and Readhead, A.C.S., 1979, Nature, 227, 182 Google Scholar
Rees, M.J., 1967, M.N.R.A.S., 135, 345 Google Scholar
Romney, J., et al., 1981, in preparation Google Scholar
Salvati, M, 1979, Astrophys. J., 233, 11 Google Scholar
Shaperovskaya, N. Ya., 1978, Soviet Astron., 22, 544 Google Scholar
Spangler, S.R., and Cotton, W.D., 1981, Astron. J., 86, 730 CrossRefGoogle Scholar