Intensity correlation of ionizing background at high redshifts

Mathematics – Probability

Scientific paper

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Absorption Spectra, Intergalactic Media, Ionization, Lyman Alpha Radiation, Quasars, Red Shift, Luminosity, Probability Distribution Functions, Signal To Noise Ratios

Scientific paper

The correlation of the background ionizing field at high redshifts is analyzed by studying the relation between the intensity correlation and the equivalent width correlation of QSO Ly alpha forest lines. It is postulated that the source-space density can be constrained by means of the observable equivalent width correlation. The intensity correlation function (ICF) is computed for random groups of QSOs with attention given to the effects of QSO absorption-line systems. The ICF is obtained at high redshifts by using the Ly alpha forest-line clouds, and 1/W correlations are found near the QSO emission redshifts. The effect can be attributed to the enhanced ionizing field near the QSOs which sheds light on the properties of specific QSOs such as Q0000-263. The technique is found to give potentially useful data regarding the dominating ionizing sources at early epochs when utilized with good observational data.

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