Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252...39m&link_type=abstract
Astrophysical Journal, Part 1, vol. 252, Jan. 1, 1982, p. 39-53.
Astronomy and Astrophysics
Astrophysics
55
Emission Spectra, Plasma Clouds, Quasars, Seyfert Galaxies, Spectral Line Width, X Ray Sources, Angular Acceleration, Astronomical Models, Gravitational Effects, H Alpha Line, Lyman Alpha Radiation, Plasma Density, Pressure Distribution
Scientific paper
The theory of radiatively accelerated simple and pancake clouds developed by Blumenthal and Mathews (1975, 1979) is simplified through the adoption of a cylindrical geometry for the clouds, in view of uncertainties encountered in the drag interactions shaping the leading edge of the clouds and the advantage of extension to include the effects of X-rays. From a study of three identical clouds produced in a specific intercloud environment, it is shown that approximate line profiles of Lyman-alpha and H-alpha may differ, with H-alpha having the larger FWHM. The emission lines mainly produced in cloud regions accelerated by X-radiation may be broad and flat-topped relative to Lyman-alpha, especially in objects with sufficient X-ray flux. The model predicts that such nonlogarithmic line profiles may be sensitive to far-UV or X-ray continuum flux variations, conforming to the situations observed in 3C 390.3 and NGC 7603, and provides dynamic explanations for the restricted range of cloud plasma densities between 10 to the 8th and 10 to the 10th/cu cm.
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