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An X-ray heated wind in NGC 1068
Krolik, J. H.; Begelman, M. C.
AA(Johns Hopkins University, Baltimore, MD), AB(Joint Institute for Laboratory Astrophysics, Boulder, CO)
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 308, Sept. 15, 1986, p. L55-L58. Research supported by Rockwell International Corp., Exxon Education Foundation, and Ball Corp. (ApJL Homepage)
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NASA/STI Keywords:
Astronomical Models, Galactic Nuclei, Plasma Dynamics, Radiant Heating, Seyfert Galaxies, X Ray Astronomy, Active Galactic Nuclei, Electron Scattering, Optical Thickness, Plasma Temperature, Starburst Galaxies, Stellar Evolution
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Recent work published by Antonucci and Miller in 1985 has demonstrated the existence of a type 1 Seyfert nucleus inside the archetypical type 2 Seyfert galaxy NGC 1068. This nucleus is surrounded by an obscuring torus and is visible only by reflection from a warm electron scattering region on the torus's axis. Here it is shown that the warm region must be in a dynamic state and out of radiative equilibrium with the nuclear continuum. It is suggested that the source of this moving gas is the cold obscuring torus itself, and that the warm region is part of a wind driven by heating due to the central continuum. The obscuring torus may be an inner extension of the starburst region already known in NGC 1068. This model gives estimates of the temperature and optical depth of the electron scattering region consistent with the observed values. Variations in viewing angle and optical thickness in the torus may account for the range of observed properties in active galactic nuclei.

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