Other
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..388b&link_type=abstract
Astrophysical Journal, Part 1, vol. 236, Mar. 1, 1980, p. 388-405. Research supported by the Science Research Council of Englan
Other
85
Galactic Nuclei, Galactic Structure, Nebulae, Seyfert Galaxies, Spectrophotometry, Abundance, Emission Spectra, Galactic Rotation, H Ii Regions, Photoionization, Radial Velocity
Scientific paper
Spectrophotometric observations have been made of the nebulosity surrounding the Seyfert (or N) galaxy 3C 120, as well as of the nucleus. Observations of the nebulosity reveal an extensive network of H II regions characterized by a high ionization level, which, it is argued, is due to photoionizations by the nucleus. The O/H and N/O abundance ratios in this gas, at least as far out as 8 kpc from the nucleus, must be within a factor of 20 of the solar values. The velocity field of this gas is very chaotic, but the systematic gas velocities, relative to the nucleus, are mostly positive to one side of an axis passing through the nucleus at P.A. 72 deg and mostly negative on the other side. The position angle of this axis is consistent with the direction (P.A. 65 deg) along which the compact radio source in the nucleus is expanding, but it is about 45 deg away from the major or minor axes of the fainter elliptical structure visible on previously published broad-band direct plates.
Baldwin John A.
Boksenberg Alec
Burbidge Margaret. E.
Carswell Robert F.
Smith Harding E.
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