Anisotropic ionizing radiation in Seyfert galaxies. I - The extended narrow-line region in Markarian 573

Details Anisotropic ionizing radiation in Seyfert galaxies. I - The extended narrow-line region in Markarian 573 Anisotropic ionizing radiation in Seyfert galaxies. I - The extended narrow-line region in Markarian 573

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...386..485t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 386, Feb. 20, 1992, p. 485-497. Research supported by European Southern Obs

Astronomy and Astrophysics

Astrophysics

44

Astronomical Spectroscopy, Galactic Nuclei, Ionizing Radiation, Markarian Galaxies, Seyfert Galaxies, Anisotropy, Dynamics, Imaging Techniques, Kinematics, Narrowband

Scientific paper

The morphology, kinematics, and ionization state of the nuclear extended narrow-line region (ENLR) of the Seyfert 2 galaxy Mrk 573 are studied using narrow-band images of a grid of long-slit spectra. The entire ENLR is mapped spectroscopically, and velocity structure is studied. The velocity field map shows a typical galactic rotation picture with some important deviations. A simple geometric model, in accordance with the 'unified schemes', is employed to study the effects of various parameters of the observed picture. The best match is achieved when a biconical radiation field illuminates the ISM of the host galaxy that takes part in a normal galaxy rotation but also has radial motions close to the nucleus. The emission-line images reveal an ENLR elongated along the radio axis in the northwest-southeast direction, but a map of the flux ratio forbidden O III 5007/(H-alpha + forbidden N II) shows a different structure, with the highest excitation peak offset by about 4 arcsec along the radio axis to the southeast.

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