Hydrogen line and continuum emission in quasars

Details Hydrogen line and continuum emission in quasars Hydrogen line and continuum emission in quasars

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233l..91k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 233, Nov. 1, 1979, p. L91-L95.

Astronomy and Astrophysics

Astrophysics

98

Astronomical Spectroscopy, Continuous Spectra, Hydrogen Clouds, Line Spectra, Quasars, Balmer Series, Emission Spectra, Lyman Alpha Radiation, Photoionization

Scientific paper

Combined photoionization and hydrogen excited-state population equilibrium models are calculated for QSO emission-line clouds. Ionization from excited states increases the ionized column density to several times more than that calculated on the basis of ground-state ionization alone. In the region where L-alpha is thermalized Balmer lines provide the main cooling. Integrated over the cloud, the ratios L-alpha/H-alpha and H-alpha/H-beta are 2 and 4.7, respectively. The Balmer continuum emission is also substantially increased by the inclusion of excited-state ionization.

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