In 21 of 46 multi-epoch BAL quasars, fractional changes in the 1350 Å continuum significantly correlate with fractional changes in C IV/Si IV BAL equivalent widths, mostly negatively, supporting photoionization-driven variability.
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Correlations between the Variation of the Ionizing Continuum and Broad Absorption Lines in Individual Quasars
In 21 of 46 multi-epoch BAL quasars, fractional changes in the 1350 Å continuum significantly correlate with fractional changes in C IV/Si IV BAL equivalent widths, mostly negatively, supporting photoionization-driven variability.