On the nature of emission-line clouds of quasars and active galactic nuclei

Details On the nature of emission-line clouds of quasars and active galactic nuclei On the nature of emission-line clouds of quasars and active galactic nuclei

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347...74k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. 74-86.

Astronomy and Astrophysics

Astrophysics

49

Active Galactic Nuclei, Emission Spectra, Line Spectra, Quasars, Active Galaxies, Astronomical Models, Photoionization, Stellar Envelopes, Stellar Winds

Scientific paper

It is proposed that the clouds responsible for the emission lines in AGN and QSOs are stratified and not uniform in density. Specifically, it is suggested that they are winds from evolved stars, in particular red giants. This assumption appears to solve, in straightforward fashion, several problems concerning the origin, dynamics, and response of these clouds to changes in the continuum luminosity, while preserving the most successful feature of the current two-phase equilibrium photoionization models.

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