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We have estimated the probability of a partial coverage of QSO broad-line regions by intervening H2-clouds. This effect has been revealed by an analysis of H2 absorption systems in QSO spectra [1, 2]. Accounting of the effect may change significantly physical parameters of interstellar clouds derived from the spectral analysis [2]. We show that the probability of incomplete coverage turns out to be not lower than about 8%. Actually, a frequency of the effect revealing may occur essentially higher than this quantity, encouraging us in further systematic searches of the incomplete coverage in the H2 absorption QSO spectra.

Estimated probability of the partial coverage of QSOs by intervening H2-clouds at formation of QSO absorption-line spectra

Estimated probability of the partial coverage of QSOs by intervening H₂-clouds at formation of QSO absorption-line spectra