Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pazh....7...79t&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 7, Feb. 1981, p. 79-82.) Soviet Astronomy Letters, vol. 7, Jan.-Feb. 1981, p. 42-45. Tr
Astronomy and Astrophysics
Astronomy
1
Astronomical Spectroscopy, Emission Spectra, Line Spectra, Seyfert Galaxies, Electron Density (Concentration), Interstellar Gas, Oxygen Spectra, Red Shift, Spectral Line Width
Scientific paper
A spectroscopic analysis of the Seyfert I galaxies Ark 564 and III Zw 77 and the Seyfert 2 object I Zw 92 is described. Redshifts, equivalent widths, flux densities, and luminosities are determined for emission lines on spectrograms taken with the 2.6-m Crimean reflector. The electron density and temperature of the gas are estimated from the relative forbidden O III line intensities. Some physical parameters (volume, mass, characteristic size, kinetic energy) are evaluated for the gas responsible for the permitted and forbidden emission lines. The mass of the central body in each nucleus and the luminosity in the 3600-7000 A interval are estimated.
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