Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975azh....52..481p&link_type=abstract
Astronomicheskii Zhurnal, vol. 52, May-June 1975, p. 481-490. In Russian.
Astronomy and Astrophysics
Astronomy
7
Balmer Series, Emission Spectra, Galactic Nuclei, Hydrogen Clouds, Line Spectra, Seyfert Galaxies, Galactic Radiation, H Lines, Interstellar Gas, Luminous Intensity
Scientific paper
The intensities and profiles of the Balmer emission lines from the gas envelope of the nucleus of NGC 7469 are shown to vary with a characteristic time of the order of 20 days. The H-alpha line near the profile base is found to be twice as narrow as the H-gamma line. It is also shown that the hydrogen envelope of this galaxy's nucleus is extremely inhomogeneous in density. Flares are observed in the denser inner part of the envelope, and it is noted that this inner region brightens before the onset of a flare while the outer region, which is more extended and rarefied, brightens during flare activity. Estimates are given for the radius, density, electron temperature, and degree of opacity in Ly-alpha of the inner part of the envelope.
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