Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..104w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 1, 1986, p. 104-120.
Astronomy and Astrophysics
Astrophysics
9
Active Galaxies, Astronomical Models, Galactic Nuclei, Interstellar Gas, Molecular Clouds, Active Galactic Nuclei, Differential Equations, Distribution Functions, H Beta Line, Seyfert Galaxies, Trajectory Analysis
Scientific paper
An analytic method is derived for calculating the distribution function of cloud properties in any region of an active galactic nucleus from the evolution of individual clouds along their trajectories. A simple model containing supersonic clouds confined by ram pressure illustrates the distribution function method and its effect on calculated line profiles. In developing this model, attention is drawn to a thermomechanical imbalance which can be important for clouds whose mechanical equilibrium is set by ram pressure balance, but whose thermal equilibrium is set by a central ionizing source. This imbalance can occur along some trajectories and may result in cloud destruction. The implications of cloud distribution functions and cloud destruction processes on the evaluation of realistic line profiles are discussed.
Saslaw William C.
Whittle Mark
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