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Theoretical Studies of the Line Emission Spectrum

Published online by Cambridge University Press:  19 July 2016

S. Collin-Souffrin*
Affiliation:
DAF, Observatoire de Meudon, 92195 Meudon Cédex and Research associate at Institut d'Astrophysique, Paris, France

Abstract

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Our knowledge of the physical conditions and of the structure of the broad line emissive region -the BLR- is reviewed. First we derive the model independent constraints on the different zones emitting the broad lines. Then we discuss photoionized models. In a first step the BLR is assumed to be made only of one type of cloud emitting all the broad lines. We show that this model is unable to explain the observed spectrum. We thus assume that the high and low ionization lines are emitted by different clouds, still photoionized. This assumption is also in contradiction with the observations and we are led to the idea of a large variety of emitting clouds. Finally the hypothesis of a purely radiative heating mechanism should also be questioned.

Type
III. Spectral Line Studies
Copyright
Copyright © Reidel 1986 

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