The complex narrow-line region in NGC 4151

Details The complex narrow-line region in NGC 4151 The complex narrow-line region in NGC 4151

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.241p..31p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 241, Nov. 15, 1989, p. 31P-36P. Research supported by t

Astronomy and Astrophysics

Astronomy

53

Active Galactic Nuclei, Astronomical Spectroscopy, Seyfert Galaxies, Spectral Line Width, Anisotropy, Charge Coupled Devices, Emission Spectra, Galactic Structure, H Alpha Line, Telescopes

Scientific paper

New narrow-band images of NGC 4151, taken in excellent seeing conditions with the 4.2-m William Herschel Telescope are presented. These reveal a wealth of detail that can be used to test models for the anisotropy of the narrow-line region. From forbidden O III (4959, 5007)/H-alpha line ratio map, three important features are identified: (1) a jet-like linear structure that extends in a series of relatively high-ionization blobs along PA of about 50 deg out to a radius of more than 15 arcsec to the south-west and 5 arcsec to the north-east; (2) a lower ionization halo surrounding the linear structure; and (3) a band of lower ionization or higher obscuration through the nucleus, almost perpendicular to the linear structure.

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