A Comparison of Properties of Quasars with and without Rapid Broad Absorption Line Variability
A Comparison of Properties of Quasars with and without Rapid Broad Absorption Line Variability
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DOI：
10.3847/1538-3881/ab83f5
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发表时间：
2020-04
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通讯作者：
Takashi Horiuchi;T. Morokuma;T. Misawa;H. Hanayama;T. Kawaguchi
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作者：
Takashi Horiuchi;T. Morokuma;T. Misawa;H. Hanayama;T. Kawaguchi
本文研究了宽吸收线（BAL）类星体在不同时间尺度（从10天到几年）的静息期紫外通量变异性与宽吸收线等效宽度（EWs）变异性之间的相关性。我们使用了斯隆数字巡天混响测绘项目的BAL EWs数据集和中间帕洛玛瞬变工厂在g和R波段的光度数据集，以及在grizy波段的全景巡天望远镜和快速响应系统。结果表明：(1)通量变异性与BAL变异性呈弱、中、强正相关；(2)具有显著短时间尺度电子束变异性（S1类）的BAL类星体与不具有显著短时间尺度电子束变异性（S2类）的类星体之间的通量变异性幅度无显著差异；(3)在本文所考虑的所有时间尺度上，S1类类星体的BAL变率幅度系统地大于S2类类星体；(4) S2类类星体的黑洞质量（中等正）、Eddington比和吸积盘温度（强负）等物理参数与BAL变异性之间可能存在相关性。这些结果表明，BAL的变化需要电离连续体的变化和辅助机制，如位于吸积盘最内层区域的x射线保护气体的变化。
We investigate the correlation between rest-frame UV flux variability of broad absorption line (BAL) quasars and their variability in BAL equivalent widths (EWs) in a various timescale from <10 days to a few years in the quasar rest frame. We use the data sets of BAL EWs taken by the Sloan Digital Sky Survey Reverberation Mapping project and photometric data taken by the intermediate Palomar Transient Factory in the g and R bands and the Panoramic Survey Telescope and Rapid Response System in grizy bands. Our results are summarized as follows: (1) the distributions of flux variability versus BAL variability show weak, moderate, or a strong positive correlation; (2) there is no significant difference in flux variability amplitudes between BAL quasars with significant short timescale EW variability (called class S1) and without (class S2); (3) in all timescales considered in this paper, the class S1 quasars show systematically larger BAL variability amplitudes than those of the class S2 quasars; and (4) there are possible correlations between BAL variability and physical parameters of the quasars such as black hole masses (moderate positive), Eddington ratios, and accretion disk temperature (strong negative) in the class S2 quasars. These results indicate that the BAL variability requires changing in the ionizing continuum and an ancillary mechanism such as variability in X-ray shielding gas located at the innermost region of an accretion disk.