Physical conditions in active nuclei. III - Lyman-beta and O VI 1035-A emission from QSOs

Details Physical conditions in active nuclei. III - Lyman-beta and O VI 1035-A emission from QSOs Physical conditions in active nuclei. III - Lyman-beta and O VI 1035-A emission from QSOs

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.177..473n&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 177, Nov. 1976, p. 473-482. Research supported by the Israel Commission

Astronomy and Astrophysics

Astrophysics

37

Emission Spectra, Mass Distribution, Optical Thickness, Quasars, Red Shift, Astronomical Models, Astrophysics, Balmer Series, Photoionization, Radio Astronomy

Scientific paper

An emission line at approximately 1030 A in the spectrum of QSOs is investigated. Emission of Ly-beta by recombination in an optically thin atmosphere cannot explain this feature, as Ly-gamma, which would also appear, is not observed. Some contribution to the line may be due to Ly-beta leakage from a gas optically thick to Balmer-line radiation. The predicted intensity of the O VI 1035-A and other ultraviolet lines is computed with the aid of a photoionization model, and the O VI line is shown to have the observed intensity provided a large fraction of the quasar mass is concentrated in the center.

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