VizieR Online Data Catalog: Quasars narrow absorption lines from SDSS (Lu+, 2017)

We have studied the correlation between the NAL variability and the continuum variability using a sample of two-epoch SDSS spectra of 40 quasars with 52 variable narrow-absorption systems. We analysed quantitatively the variability amplitude of EWs of CIV absorption lines and that of the continuum flux and found a significant correlation between them. As hinted at by the statistical results, we propose that the changes of the CIV λλ1548, 1551 absorption doublets in our sample are driven mainly by the fluctuations of the ionizing continuum.

(1 data file).