Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984xue..conf..218s&link_type=abstract
In Max-Planck Inst. für Physik und Astrophysik X-Ray and UV Emission from Active Galactic Nuclei p 218-220 (SEE N85-17790 08-88)
Astronomy and Astrophysics
Astrophysics
Astronomical Models, Galactic Nuclei, Line Spectra, Stellar Winds, Accretion Disks, Compton Effect, Entrainment, Particle Acceleration, X Ray Spectra
Scientific paper
A model for broad-line regions in which the X-ray flux from a galactic nucleus Compton-heats an accretion disk, releasing a large amount of hot gas as a wind is discussed. This material becomes entrained into a wind blowing from the nucleus. Provided the ram pressure of the nuclear wind exceeds that of the disk wind, it collapses into clouds. The nuclear wind accelerates small clouds to higher velocities, corresponding to observed line widths. Large clouds fall inwards. Cloud sizes, line asymmetries and variability characteristics are determined. While large clouds can be responsible for a blueward shift of a peak of a line, the fast-moving small clouds can enhance the red wing.
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