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Ionization and Kinematics of the Narrow Line Region in Seyfert Galaxies

Published online by Cambridge University Press:  04 August 2017

A. S. Wilson
A. S. Wilson*
Affiliation:
Astronomy Program, University of Maryland, College Park MD 20742 U.S.A.

Abstract

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Direct imaging of Seyfert galaxies in emission lines and high resolution radio mapping often show their narrow line regions and linear (double or jet-like) radio sources to be aligned on the hundreds of parsecs scale. This relationship is unlikely to reflect ionization of the thermal gas by the expanding radio components or by their relativistic electrons. The most likely explanation, which is also favored by optical polarization measurements, is that ionizing photons escape preferentially along the rotation axis of the same inner (≲ pc scale) disk as collimates the radio jet. Such a bipolar form may be the most common morphology of the narrow line region. Differences of radio properties between Seyfert type 1's and 2's may be at least partially related to aspect effects. The north east radio lobe of NGC 1068 shows a limb-brightened, conical structure with the magnetic field running parallel to the edge of the cone. This source is modelled in terms of a radiative bow shock wave being driven into the interstellar medium of the galaxy by the radio ejecta. If the pre-shock density is as high as 400 cm−3, as suggested by CO measurements, the shock velocity is found to be ≃ 75 km s−1 and the jet velocity ≃ 4000 km s−1, the latter being close to the emission line widths. The narrow line region in this galaxy is morphologically and kinematically associated with the jet.

Type
V. Jets, Superluminal Motions and Blazars
Information
Symposium - International Astronomical Union , Volume 121: Observational Evidences of Activity of Galaxies , 1987 , pp. 237 - 254
Copyright
Copyright © Reidel 1987 

References

Adams, T. F. 1973, Ap. J., 179, 417.Google Scholar
Allen, A. J. 1984, M.N.R.A.S., 210, 147.Google Scholar
Alloin, D., Lacques, P. Pelat, D., and Despiau, R. 1981, Astr. Ap. Suppl., 43, 231.Google Scholar
Antonucci, R. R. J. 1983, Nature, 303, 158.CrossRefGoogle Scholar
Antonucci, R. R. J., and Miller, J.S. 1985, Ap. J., 297, 621.Google Scholar
Baldwin, J. A., Wilson, A. S., and Whittle, M. 1986, Ap. J., (submitted).Google Scholar
Balick, B., and Heckman, T. M. 1979, A. J., 84, 302.CrossRefGoogle Scholar
Balick, B., and Heckman, T. M. 1985, A. J., 90, 197.Google Scholar
Bertola, F. 1966, Pub. Obs. Padova, No. 134.Google Scholar
Booler, R. V., Pedlar, A., and Davies, R. D. 1982, M.N.R.A.S., 199, 229.CrossRefGoogle Scholar
Cecil, G., Tully, R. B., and Bland, J. 1986, Bull. A.A.S., 18, 640.Google Scholar
Davidson, K., and Netzer, H. 1979, Rev. Mod. Phys., 51, 715.CrossRefGoogle Scholar
de Bruyn, A. G., and Wilson, A. S. 1978, Astr. Ap., 64, 433.Google Scholar
Ferland, G. J. 1981, Ap. J., 249, 17.Google Scholar
Ferland, G. J., and Mushotzky, R. F. 1984, Ap. J., 286, 42.Google Scholar
Ferland, G. J., and Shields, G. A. 1985, see Miller 1985, p. 157.Google Scholar
Ford, H. C., Crane, P. C., Jacoby, G. C., Lawrie, D. G., and van der Hulst, 1985, Ap. J., 293, 132.Google Scholar
Heckman, T. M., Miley, G. K., van Breugel, W. J. M., and Butcher, H. R. 1981, Ap. J., 247, 403.Google Scholar
Hollenbach, D. J., and McKee, C. F. 1979, Ap. J. Suppl., 41, 555.Google Scholar
Huchra, J. P. 1985, Catalog of Seyfert Galaxies, distributed privately.Google Scholar
Hummel, E. 1981, Astr. Ap., 93, 93.Google Scholar
Krolik, J., and Begelman, M.C. 1986, Preprint.Google Scholar
Lawrence, A., and Elvis, M. 1982, Ap. J., 253, 410.Google Scholar
Mathews, W. G., and Capriotti, E. R. 1985, see Miller, 1985 p. 185.Google Scholar
McKee, C. F., and Hollenbach, D. J. 1980, Ann. Rev. Astr. Ap., 18, 219.Google Scholar
Meurs, E. J. A., and Wilson, A. S. 1984, Astr. Ap., 136, 206.Google Scholar
Miller, J. S., ed., 1985, Astrophysics of Active Galaxies and Quasi-Stellar Objects, based on the 1984 Santa Cruz Astrophysics Workshop (University Science Books).Google Scholar
Morris, S., Ward, M., Whittle, M., Wilson, A. S., and Taylor, K. 1985, M.N.R.A.S., 216, 193.Google Scholar
Neugebauer, G. et al. 1980, Ap. J., 238, 502.Google Scholar
Nittmann, J., Falle, S. A. E. G., and Gaskell, P. H. 1982, M.N.R.A.S., 201, 833.Google Scholar
Osterbrock, D. E. 1983, In IAU Symposium 103, Planetary Nebulae, ed. Flower, D. R. p. 473 (Reidel, Dordrecht).Google Scholar
Osterbrock, D. E. 1985, see Miller, 1985 p. 111.Google Scholar
Pedlar, A., Booler, R. V., Spencer, R. E., and Stewart, O. J. 1983, M.N.R.A.S., 202, 647.Google Scholar
Pedlar, A., Dyson, J., and Unger, S. W. 1985, M.N.R.A.S., 214, 463.Google Scholar
Scott, J. S., Holman, G. D., Ionson, J. A., and Papadopoulos, K. 1980, Ap. J., 239, 769.Google Scholar
Scoville, N. Z., Young, J. S., and Lucy, L. B. 1983, Ap. J., 270, 443.Google Scholar
Ulrich, M.-H. 1973, Ap. J., 181, 51.Google Scholar
Ulvestad, J. S. 1981, , University of Maryland.Google Scholar
Ulvestad, J. S., Wilson, A. S., and Sramek, R. A. 1981, Ap. J., 247, 419.Google Scholar
Ulvestad, J. S., and Wilson, A. S. 1983, Ap. J. (Letters), 264, L7.Google Scholar
Ulvestad, J. S., and Wilson, A. S. 1984a, Ap. J., 278, 544.Google Scholar
Ulvestad, J. S., and Wilson, A. S. 1984b, Ap. J., 285, 439.Google Scholar
Ulvestad, J. S., Neff, S. G., and Wilson, A. S. 1986, A. J. (in press).Google Scholar
Unger, S. W., Pedlar, A., Axon, D. J., Harrison, B. A., Meurs, E. J. A., Ward, M. J., and Whittle, M. 1986, private communication.Google Scholar
van Breugel, W. J. M., Miley, G. K., and Heckman, T. M. 1984, A. J., 89, 5.Google Scholar
van der Laan, H. 1962, M.N.R.A.S., 124, 125.Google Scholar
Walker, M. F. 1968, Ap. J., 151, 71.Google Scholar
Whittle, M. 1985, M.N.R.A.S., 213, 33.Google Scholar
Whittle, M. 1986, Colloquium at University of Maryland, April 2.Google Scholar
Whittle, M., Haniff, C. A., Ward, M. J., Meurs, E. J. A., Pedlar, A., Unger, S. W., Axon, D. J., and Harrison, B. A. 1986, M.N.R.A.S. (in press).Google Scholar
Wilson, A. S. 1982, In IAU Symposium 97, Extragalactic Radio Sources, p. 179 (Reidel, Dordrecht).Google Scholar
Wilson, A. S. 1986, Ap. J. (Letters), submitted. See also related paper in Proceedings of Conference Star Formation in Galaxies , California Institute of Technology, in press.Google Scholar
Wilson, A. S., and Ulvestad, J. S. 1982, Ap. J., 260, 56.Google Scholar
Wilson, A. S., and Ulvestad, J. S. 1983, Ap. J., 275, 8.Google Scholar
Wilson, A. S., and Heckman, T. M. 1985, see Miller, 1985 p. 39.Google Scholar
Wilson, A. S., Baldwin, J. A., and Ulvestad, J. S. 1985, Ap. J., 291, 627.Google Scholar
Wynn-Williams, C. G., Becklin, E. E., and Scoville, N. Z. 1985, Ap. J., 297, 607.Google Scholar