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High densities in QSO and seyfert broad-line clouds*

Published online by Cambridge University Press:  19 July 2016

R. C. Puetter
R. C. Puetter*
Affiliation:
Center for Astrophysics and Space Sciences, The University of California, San Diego La Jolla, California 92093 The United States of America

Abstract

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While it is widely held that the densities of QSO and Seyfert broad-line regions lie below 1011 cm−3, there is a growing body of evidence, indicating that at least some of the broad-line gas has densities equal to or exceeding 1011 cm−3. Such evidence includes (1) the presence of a 3μm “bump” in roughly half of all QSOs, (2) the depression of Brγ in several Seyfert galaxies, (3) the broad-line variablity in some objects, and (4) the ability to produce the hydrogen spectrum theoretically.

Type
III. Spectral Line Studies
Information
Symposium - International Astronomical Union , Volume 119: Quasars , 1986 , pp. 341 - 342
Copyright
Copyright © Reidel 1986 

References

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