Other
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.216..439f&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 216, Sept. 15, 1985, p. 439-446.
Other
4
Astronomical Spectroscopy, Galactic Nuclei, Galactic Structure, Oxygen Spectra, Seyfert Galaxies, Forbidden Bands, Histograms, Spatial Distribution, Spatial Resolution
Scientific paper
A spatial explanation is sought for the enigmatic forbidden O III line profile found at SAAO in 1983. Offset slit spectroscopy has been carried out by SAAO and the Manchester Echelle Spectrograph on the Anglo-Australian Telescope used in 1-arcsec seeing to obtain both a long-slit high-dispersion spectrum and direct (narrow-band) images. Striking spatial differences are revealed within a forbidden O III nucleus less than about 1.5 arcsec E-W and about 0.8 arcsec N-S. The two peaks in the line profile show a spatial separation and each has its own associated broad component, so that two Seyfert 2 nuclei (separation greater than about 600 pc) exist within a common host galaxy. The observations offer insight into Seyfert 2 structure and dynamics, but the 1983 variations remain an enigma: at time only one of the nuclei is recorded, yet the close proximity of the other nucleus makes this impossible.
Fairall Anthony P.
Meaburn John
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