On photoionization analyses of emission spectra of quasars

Details On photoionization analyses of emission spectra of quasars On photoionization analyses of emission spectra of quasars

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218...20d&link_type=abstract

Astrophysical Journal, Part 1, vol. 218, Nov. 15, 1977, p. 20-32. Research supported by the Alfred P. Sloan Foundation

Astronomy and Astrophysics

Astrophysics

114

Emission Spectra, Photoionization, Quasars, Abundance, Carbon, Helium, Nitrogen, Optical Thickness, Oxygen Spectra, Radiative Transfer, Spectrum Analysis

Scientific paper

Information conveyed by emission-line intensities in the spectra of quasars are reassessed under the assumption that the line-emitting gas is photoionized by continuum radiation. An essential feature of the model is the inclusion of two gas components, each characterized by its value of U-1, the radiation-to-gas ratio. Likely values of U-1 are suggested. Some of the gas must have rather low values of U-1; while a higher-excitation component, which produces the O VI and N V lines, either has high values of U-1, or is heated by some mechanism in addition to photoionization.

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