Variability of broad absorption lines in a QSO SDSS J022844.09+000217.0 on multi-year timescales

Abstract

The variability of the broad absorption lines is investigated for a broad absorption line (BAL) QSO, SDSS J022844.09+000217.0 (z = 2.719), with 18 SDSS/BOSS spectra covering 4128 days in the observed frame. With the ratio of the rms spectrum to the mean spectrum, the relative flux change of the BAL-trough is larger than that of the emission lines and the continuum. Fitting the power-law continuum and the emission line profiles of \civ $\lambda$1549 and \siiv$\lambda$1399, we calculate the equivalent width (EW) for different epochs, as well as the continuum luminosity and the spectral index. It is found that there is a strong correlation between the BAL-trough EW and the spectral index, and a weak negative correlation between the BAL-trough EW and the continuum luminosity. The strong correlation between the BAL-trough EW and the spectral index for this one QSO suggests that dust is intrinsic to outflows. The weak correlation between the BAL variability and the continuum luminosity for this one QSO implies that the BAL-trough variation is not dominated by photoionization.

9 pages, 10 figures, published in MNRAS

References in corpus (11)

• A Catalog of Quasar Properties from SDSS DR7
• A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5
• The Sloan Digital Sky Survey quasar catalog: tenth data release
• A Systematic Analysis of Fe II Emission in Quasars: Evidence for Inflow to the Central Black Hole
• Quasar Broad Absorption Line Variability on Multi-Year Time Scales
• Outflows and the Physical Properties of Quasars
• Broad Absorption Line Variability in Repeat Quasar Observations from the Sloan Digital Sky Survey
• The Physical Nature of Polar Broad Absorption Line Quasars
• Radio spectra and polarisation properties of radio-loud Broad Absorption Line Quasars
• Outflow and hot dust emission in broad absorption line quasars
• The relation between the optical spectral slope and the luminosity for 17 Palomar-Green QSOs

Cited by in corpus (7)

• Variation of ionizing continuum: the main driver of Broad Absorption Line Variability
• Photoionization-driven Absorption Lines Variability in Balmer Absorption Line Quasar LBQS 1206+1052
• Variability of QSOs with variable regions in broad absorption troughs from the Sloan Digital Sky Survey
• Extreme Variability in a Broad Absorption Line Quasar
• Correlations between the Variation of the Ionizing Continuum and Broad Absorption Lines in Individual Quasars
• A sharp rise in the detection rate of broad absorption line variations in a quasar SDSS J141955.26+522741.1
• Discovery of the Asymmetric Effect in the Response of Photoionization Gas