Hostname: page-component-788cddb947-r7bls Total loading time: 0 Render date: 2024-10-14T13:07:51.792Z Has data issue: false hasContentIssue false
  • English
  • Français

Large Scale Jets in Class I and Class II Radio Sources and Quasars

Published online by Cambridge University Press:  14 August 2015

G.V. Bicknell
G.V. Bicknell*
Affiliation:
Mount Stromlo and Siding Spring Observatories, Institute of Advanced Studies, Australian National University

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The physics of large scale jets in class I and class II extragalactic radio sources and quasars is discussed. Class I jets appear to be turbulent, transonic jets which entrain the interstellar medium. The related jet deceleration causes a slow surface brightness decline which is usually observed. Class II jets are supersonic and terminate in an advancing shock against the external medium. Both types of jet are initially light but the ratio of jet density to external density of class I jets increases owing to entrainment. It is quite plausible that quasar jets are hypersonic and light and this may solve problems of confinement. The velocities of class I jets are of the order of a few thousand kilometers per second. Class II and quasar jets may be at least mildly relativistic. However, it is not clear whether the velocities of large scale jets in powerful sources are close to the speed of light. Recent depolarization measurements provide an interesting focus for discussion of this question.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 8: Highlights of Astronomy. As presented at the XXth General Assembly of the IAU, 1988 , 1989 , pp. 409 - 416
Copyright
Copyright © Kluwer 1989

References

Barthel, P.D. and Miley, G.R., 1988a, S.T.Sc. Ipreprint Google Scholar
Barthel, P.D., Miley, G.K., Schilizzi, R.T. and Lonsdale, C.T., 1988b, S.T.Sc. I preprint Google Scholar
Bicknell, G.V. 1984, Ap.J., 239, 433 Google Scholar
Bicknell, G.V., 1986a, Ap.J., 286, 68 CrossRefGoogle Scholar
Bicknell, G.V., 1986b, Ap.J., 305, 109 CrossRefGoogle Scholar
Bicknell, G.V., Parma, P., and de Ruiter, H., 1988, in preparationGoogle Scholar
Bridle, A.H., 1984, A.J., 89, 979 Google Scholar
Blandford, R.D. and Rees, M.J., 1974, M.N.R.A.S., 169, 395 Google Scholar
Cameron, R.A., 1988, Ph.D. thesis, Australian National University Google Scholar
Davis, R.J., Muxlow, T.W.B. and Conway, R.G., 1985, Nature, 318, 343 Google Scholar
Dreher, J., 1984, in Physics of Energy Transport in Extragalactic Radio Sources, ed. Bridle, A.H. and Eilek, J.A., N.R.A.O, Greenbank, 109 Google Scholar
Fanaroff, B.L. and Riley, J.M., 1974, M.N.R.A.S., 167, 31PGoogle Scholar
Fanti, R., Lari, C., Parma, P., Bridle, A.H., Ekers, R.D., and Fomalont, E.B., 1982, Astr. Ap., 110, 69 Google Scholar
Garrington, S.T., Leahy, J.P., Conway, R.G., and Laing, R.A. 1988, Nature, 331, 147 Google Scholar
Laing, R.A., 1988, Nature, 331, 149 Google Scholar
Morganti, R., Parma, P., de Ruiter, H.R., Bicknell, G.V. and Fanti, R., 1988, in preparation.Google Scholar
Norman, M.L., 1986, Bull. A.A.S.Google Scholar
Norman, M.L. and Hardee, P.E., 1988, in preparation.Google Scholar
Norman, M.L., Winkler, K.-H.A., and Smarr, L.L., 1984, in Physics of Energy Transport in Extragalactic Radio Sources, ed. Bridle, A.H. and Eilek, J.A., N.R.A.O, Greenbank, 150 Google Scholar
O’Dea, C., 1985, Ap. J., 295, 80 Google Scholar
Parma, P., de Ruiter, H.R., Fanti, C., Fanti, R., 1986, Astron. Astrophys. Suppl. Ser., 64, 135 Google Scholar
Payne, D.G. and Cohn, H. 1985, Ap.J., 291, 655 Google Scholar
Pottash, R.I. and Wardle, J.F.C., 1979, A.J., 84, 707 Google Scholar
Scheuer, P.A.G. 1974, M.N.R.A.S., 166, 513 CrossRefGoogle Scholar
Thomas, P.A., Fabian, A.C., Arnaud, K.A., Forman, W., Jones, C., 1985, M.N.R.A.S., 222, 655 Google Scholar
Unwin, S.C., Cohen, M.H., Biretta, J.A., Pearson, T.J., Seielstad, G.A., Walker, R.C., Simon, R.S. and Linfield, R.P., 1985, Ap.J., 289, 109 Google Scholar
Walker, R.C., Benson, J.M. and Unwin, S.C., 1987, Ap. J., 316, 546 Google Scholar
Williams, A.G., and Gull, S.F., 1984, Nature, 310, 33 Google Scholar