Other
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.178..451b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 178, Feb. 1977, p. 451-466. Research supported by the Smithsonian Resea
Other
136
Absorption Spectra, Astronomical Spectroscopy, Emission Spectra, Luminous Intensity, Quasars, Seyfert Galaxies, Astronomical Models, Balmer Series, Electronography, Fluorescence, Galactic Nuclei, H Lines, Hot Stars, K Lines, Optical Thickness, Radiant Flux Density, Red Shift, Spectrum Analysis, Stellar Spectrophotometry
Scientific paper
Microdensitometer scans, spectrophotometric scans, spectra, and a direct electronograph of the Seyfert galaxy Markarian 231 are presented and analyzed. It is shown that the continuum of this galaxy is remarkably red for a Seyfert and can be fitted with either a synchrotron spectrum or the spectrum of a 10,000-K black body reddened by about 2.1 magnitudes. In either case, the absolute visual magnitude of the galaxy is -25.1, the optical luminosity of many quasars. The emission-line spectrum is synthesized from the H I, He I, Fe II, and forbidden O II lines; the Balmer lines, other emission lines, and three systems of absorption lines are also examined. The role of fluorescence in the line emission is investigated, and two models for the nuclear region are considered. In one model the continuum arises from hot stars, in the other it is produced by a nonthermal source. It is concluded that Markarian 231 is an extreme object since no sharp forbidden line emission other than O II is observed, that all Lyman continuum photons may be absorbed in the dense inner region, and that the high luminosity of this galaxy places it in the quasar class.
Allen David A.
Boksenberg Alec
Carswell Robert F.
Fosbury Robert A. E.
Penston Michael V.
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