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Title:
Nearby galaxies with Seyfert-like nuclei
Authors:
Phillips, M. M.; Charles, P. A.; Baldwin, J. A.
Publication:
Astrophysical Journal, Part 1, vol. 266, Mar. 15, 1983, p. 485-501. (ApJ Homepage)
Publication Date:
03/1983
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Galactic Nuclei, Radio Galaxies, Seyfert Galaxies, X Ray Sources, Balmer Series, Emission Spectra, H Ii Regions, Line Spectra, Luminosity, Tables (Data)
DOI:
10.1086/160797
Bibliographic Code:
1983ApJ...266..485P

Abstract

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.

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