Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pazh....6..289b&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 6, May 1980, p. 289-294.) Soviet Astronomy Letters, vol. 6, May-June 1980, p. 160-163.
Astronomy and Astrophysics
Astronomy
Galactic Evolution, Line Spectra, Phase Transformations, Quasars, Seyfert Galaxies, Visible Spectrum, X Ray Irradiation, Astronomical Models, Galactic Radiation, Radiant Heating, Spectral Bands
Scientific paper
When a phase transition occurs from a thermally stable state at (5-10) x 10 to the 4th K to another stable state at (1.5-2) x 10 to the 4th K in a medium heated by X rays whose spectrum contains no soft photons with E less than 200 eV, the volume emission coefficients of optical spectral lines should undergo nonmonotonic changes. These will take the form of abrupt flares rising about the steady level by a factor of 5-20 within an interval of (1-2) x 10 to the 12th/nH sec, where nH is the number density of H atoms. This effect could prove decisive for explaining the rapid variability of the spectral lines observed in Seyfert-galaxy nuclei and quasars.
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