Abstract
The extended emission line regions (EELR) that are common around radio galaxies and quasars offer the possibility of detecting blazar beams when they are not pointing along the line of sight. In low redshift radio galaxies (z < 0.6) there are several indications, although as yet no firm proof, that the ionizing radiation field is anisotropic. These include the general tendency for the emission line structures to be aligned along the radio axis, and the fact that a power-law extrapolation of the nuclear continuum is not capable of ionizing some radio axis EELR. In the particular case of PKS 2152-69, the properties of a high ionization cloud 8 kpc from the nucleus are most consistent with a beaming/scattering model. Such a model may also be relevant to the high redshift (z > 0.6) radio galaxies which show even closer alignments between radio and emission line and optical/UV continuum structures. Potentially, observations of the EELR will allow us to place constraints on properties like the opening angle, power and spectrum of blazar beams.
Affiliated to the Astrophysics Division, Space Science Department, European Space Agency
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Baum, S.A. & Heckman, T., 1988a. Astrophys. J., in press.
Baum, S.A. & Heckman, T., 1988b. Astrophys. J., in press.
Baum, S.A., Heckman, T., Bridle, A., van Breugel, W. & Miley, G., 1988. Atrophys. J. Suppl., in press.
Burbidge, E.M. & Burbidge, G.R., 1965. Astrophys. J., 142, 1351.
Fosbury, R.A.E., Boksenberg, A., Snijders, M.A.J., Danziger, I.J., Disney, M.J., Goss, W.M., Penston, M.V., Wamsteker, W., Wellington, K.J. & Wilson, A.S., 1982. Mon. Not. R. astr. Soc., 201, 991.
Lilly, S. & Longair, M.S., 1984. Mon. Not. R. astr. Soc., 211, 833.
McCarthy, P.J., van Breugel, W., Spinrad, H. & Djorgovski, S., 1987. Astrophys. J., 247, L5.
McCarthy, P.J., Spinrad, H., van Brengel, W., Djorgovski, S., Strauss, M.A. & Dickinson, M., 1988. In: Cooling Flows in Clusters and Galaxies, A.C. Fabian (ed.), Kluwer Academic Publishers, p325.
Robinson, A., Binette, L., Fosbury, R.A.E. & Tadhunter, C.N., 1987. Mon. Not. R. astr. Soc., 227, 97.
di Serego Alighieri, S., Binette, L., Courvoisier, T.J.-L., Fosbury, R.A.E. & Tadhunter, C.N., 1988. Nature, 334, 591.
Simkin, S.M., Bicknell, G.V. & Bosma, A., 1984. Astrophys. J., 277, 513.
Tadhunter, C.N., 1986. D.Phil. Thesis, University of Sussex.
Tadhunter, C.N., Fosbury, R.A.E., Binette, L., Danziger, I.J. & Robinson, A., 1987. Nature, 316, 733.
Tadhunter, C.N., Fosbury, R.A.E. & Quinn, P., 1989. Mon. Not. R. astr. Soc., submitted.
van Breugel, W.J.W., 1986. Can. J. Phys., 64, 392.
van Breugel, W.J.W., 1988. In: Proceedings of the Ringberg Conference on Hotspots in Extragalactic Radio Sources, H.J. Röser & K. Meisenheimer (eds), in press.
van Breugel, W., Filippenko, A.V., Heckman, T. & Miley, G., 1985. Astrophys. J., 293, 83.
Veron-Cetty, M. P. & Veron, P., 1985. A Catalogue of Quasars and Active Galactic Nuclei Second Edition, ESO Scientific Report No.4.
Wilson, A.S., Ward, M.J. & Haniff, C.A., 1988. Astrophys. J., 334, 121.
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Tadhunter, C.N., Fosbury, R.A.E., di Serego Alighieri, S. (1989). Beamed ionizing radiation in radio galaxies. In: Maraschi, L., Maccacaro, T., Ulrich, M.H. (eds) BL Lac Objects. Lecture Notes in Physics, vol 334. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0031147
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DOI: https://doi.org/10.1007/BFb0031147
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