NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Anisotropic ionizing radiation in Seyfert galaxies. I - The extended narrow-line region in Markarian 573The 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.
Document ID
19920041623
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Tsvetanov, Zlatan (Maryland, University College Park, United States)
Walsh, J. R. (European Southern Observatory Garching, Federal Republic of Germany, United States)
Date Acquired
August 15, 2013
Publication Date
February 20, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 386
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF AST-87-19207
CONTRACT_GRANT: NAG5-1079
Distribution Limits
Public
Copyright
Other