Can quasar clouds form in thermal instabilities?

Details Can quasar clouds form in thermal instabilities? Can quasar clouds form in thermal instabilities?

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352..423m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 352, April 1, 1990, p. 423-432. Research supported by the University of Cal

Astronomy and Astrophysics

Astrophysics

39

Emission Spectra, Galactic Evolution, Interstellar Gas, Quasars, Seyfert Galaxies, Thermal Instability, Magnetohydrodynamic Stability, Spectral Line Width

Scientific paper

Consideration is given to the hypothesis that the broad line-emitting clouds in quasars and Seyfert galaxies form from thermally unstable condensations in a hot cloud-confining medium. A simple model for the radiative cooling rate is described and the magnitude of the initial perturbation needed to form broad-line clouds in quasars is examined. The hydrodynamical evolution of thermally unstable regions in quiescent and expanding hot quasar atmospheres is studied. The results suggest that emission-line clouds are unlikely to arise from thermally unstable condensations in a hotter medium, but are likely to first appear in the broad-line region with densities comparable to or greater than those of typical line-emitting clouds.

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