Emission and absorption lines of QSOs and properties of the gas that produces them

Computer Science

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Absorption Spectra, Emission Spectra, Helium, Hydrogen, Quasars, Cosmic Gases, Forbidden Transitions, Ions, Line Spectra, Niobium, Silicon, Spectrum Analysis

Scientific paper

Details of emission features of 160 QSOs are collected. Based on the available features of 220 objects, a set of average observed equivalent widths is determined for the composite QSO. Electron collisional excitation cross-sections for 33 permitted transitions are calculated by the impact parameter method. Using these and the available cross-sections for the forbidden and semi-forbidden transitions, line emission rates can be calculated. The process of depopulating the metastable levels of the forbidden lines by photon absorptions are discussed. Critical radii, within which this process is important, are calculated for gas optically thin to the ionizing photons. A model of optically thick gas surrounding the ionizing source is generated where the ionizing photons are absorbed by hydrogen, helium and also heavy elements.

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