Other
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266..485p&link_type=abstract
Astrophysical Journal, Part 1, vol. 266, Mar. 15, 1983, p. 485-501.
Other
190
Galactic Nuclei, Radio Galaxies, Seyfert Galaxies, X Ray Sources, Balmer Series, Emission Spectra, H Ii Regions, Line Spectra, Luminosity, Tables (Data)
Scientific paper
Seyfert galaxies are defined as that class of objects which show strong, broad emission lines arising in a bright semistellar nucleus. In connection with their obvious spectroscopic similarities to QSOs, Seyfert galaxies have become the objective of numerous investigations at all wavelengths. The discovery of narrow-line X-ray galaxies suggested that many other nearby galaxies with Seyfert-like nuclear activity may have gone undetected. The decision was made to examine this possibility by observing 24 emission-line galaxies identified as being of 'high excitation' by Sandage (1978) in his spectroscopic survey of 666 nearby galaxies. The present investigation is concerned with new optical, X-ray, and radio data for these galaxies and also for a comparison sample of four galaxies with 'normal' H II region nuclei. Attention is also given to the degree to which the nuclear activity in the Sandage high-excitation galaxies is related to the nonthermal activity found in classical Seyferts.
Baldwin John A.
Charles Phil A.
Phillips Marcia
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