Diffuse ionized medium in NGC 1068

Details Diffuse ionized medium in NGC 1068 Diffuse ionized medium in NGC 1068

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..906b&link_type=abstract

(Rice University and University of Texas, Texas-Mexico Conference on Astrophysics: Plasmas in Astrophysics, 3rd, Rice University

Astronomy and Astrophysics

Astrophysics

7

Active Galactic Nuclei, H Alpha Line, H Ii Regions, Interstellar Gas, Seyfert Galaxies, Emission Spectra, Fabry-Perot Interferometers, Starburst Galaxies

Scientific paper

Additional evidence is presented for the existence of an extended (about 10 kpc; about 135 arcsec), diffuse ionized medium (DIM) recently detected in the nearby, luminous Seyfert galaxy NGC 1068. The DIM phase was recognized from spectrophotometric H-alpha and N II forbidden-line 6548, 6584 line emission maps obtained with the Hawaii Imaging Fabry-Perot Interferometer (HIFI). It is demonstrated that the H-alpha equivalent-width distribution, when combined with the N II forbidden-line 6584/H-alpha line ratio distribution, permits a clean separation of the DIM from the adjacent H II region population. The main reasons that lead to a belief that the DIM is photoexcited predominantly by scattered light from the active nucleus rather than the extended stellar population are summarized.

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