Kinematics and ionization of extended gas in active galaxies. III - The extranuclear properties of NGC 1068

Details Kinematics and ionization of extended gas in active galaxies. III - The extranuclear properties of NGC 1068 Kinematics and ionization of extended gas in active galaxies. III - The extranuclear properties of NGC 1068

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319...84b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. 84-104.

Other

105

Active Galaxies, Astronomical Spectroscopy, Galactic Nuclei, Gas Dynamics, Gas Ionization, Seyfert Galaxies, Emission Spectra, H Beta Line, Line Shape, Velocity Distribution

Scientific paper

The kinematic and ionization structure of the extranuclear gas of the Seyfert 2 galaxy NGC 1068 has been investigated using a grid of 28 high- and seven low-dispersion long-slit spectra. The velocity field of most of the gas more than 15 arcsec from the nucleus is well described by a rotating disk with an approximately flat rotation curve. The kinematic line of nodes coincides with the major axis of the outermost continuum light, and the disk inclination derived from the axial ratio of the outer isophotes and the kinematic fit are broadly consistent. The progressive change of the position angle of the major axes of the brighter isophotes are evidently due to a superposition of oval or barlike distortions in the galactic plane. The observed ionization structure of the gas can be understood as a mixture of two disk components projected on top of each other. Much of the ionization pattern in the other disk may result from partial beaming of the ionizing continuum radiation as it escapes from the nucleus.

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