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.
Correlation between the ionizing continuum and variable C iv broad absorption line in multi-epoch observations of SDSS J141007.74+541203.3
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abstract
Correlation between the variations of quasar absorption lines and the ionizing continuum have been recently confirmed in systematic studies. However, no convincing individual case is reported. We present a statistical analysis of the variable C iv broad absorption line (BAL) in the quasar SDSS J141007.74+541203.3, which have been observed with 44 epochs by the Sloan Digital Sky Survey Data Release 14. Grier et al. (2015) has recently concluded that the most likely cause of the variability of the BAL in SDSS J141007.74+541203.3 is a rapid response to changes in the incident ionizing continuum. In this paper, we confirm the anticorrelation between the equivalent width of BALs and the flux of the continuum based on the spectra of this quasar that show significant variations, which serve as another independent evidence for the view of Grier et al. (2015).
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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.