Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210...27g&link_type=abstract
Astrophysical Journal, vol. 210, Nov. 15, 1976, pt. 1, p. 27-32. Research supported by the National Research Council of Canada.
Astronomy and Astrophysics
Astrophysics
14
Astronomical Spectroscopy, Galactic Nuclei, H Alpha Line, Line Spectra, Seyfert Galaxies, Spectral Energy Distribution, Emission Spectra, Forbidden Transitions, Radial Velocity, Silicon
Scientific paper
Results are reported for spectroscopic observations of the nuclei of the Seyfert galaxies NGC 1068, NGC 1275, NGC 7469, and 3C 120 in the 6500-A H-alpha region and the 9100-A region (NGC 1068 only), using a self-scanned silicon diode array with signal storage in the memory of an on-line minicomputer. The profile of the forbidden S III line at 9069 A in NGC 1068 is found to be in excellent agreement with a previously reported profile of the forbidden O III line at 5007 A and is interpreted as four narrow components with different radial velocities and intensities. Relative line strengths are computed for several forbidden emission features observed over the spectral range from 6300 to 6731 A in each galaxy. Line identifications are discussed, and the intensity ratio of forbidden S II emission at 6717 A to that at 6731 A is estimated to be very close to unity in all four galaxies.
Glaspey John W.
Stockton Alan
Walker Gordon A. H.
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