High-excitation extranuclear gas in the Seyfert galaxy NGC 1068

Journal Article · Fri Oct 31 23:00:00 EST 1986 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/184773· OSTI ID:6932462

Evans, I N; Dopita, M A

Optical spectrophotometry of candidate near-nuclear H II regions in the disk of the Seyfert galaxy NGC 1068 indicates the presence of high-excitation extranuclear emission. The optical spectra appear to be very similar to ordinary H II region spectra with the addition of strong lines of forbidden Ne V 3446 and 3426 A and He II 4686 A. This is interpreted as the superposition of an H II region spectrum with the high-excitation emission and present theoretical nebular models which suggest that the high-excitation gas is most likely photoionized by a power-law spectrum, probably from the nearby Seyfert nucleus. 32 references.

• Research Organization: Mount Stromlo and Siding Spring Observatories, Canberra, Australia
• OSTI ID: 6932462
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 310; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BALMER LINES
COSMIC RADIO SOURCES
ELEMENTS
FLUIDS
GALAXIES
GASES
H2 REGIONS
HELIUM
IONIZATION
NEBULAE
NONMETALS
PHOTOIONIZATION
RARE GASES
SEYFERT GALAXIES
SPECTRA
SPECTROPHOTOMETRY
VISIBLE SPECTRA