The Physical Properties of Low-redshift FeLoBAL Quasars. I. Spectral-synthesis Analysis of the Broad Absorption-line (BAL) Outflows Using SimBAL
The Physical Properties of Low-redshift FeLoBAL Quasars. I. Spectral-synthesis Analysis of the Broad Absorption-line (BAL) Outflows Using SimBAL
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DOI：
10.3847/1538-4357/ac61d9
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发表时间：
2022-03
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影响因子：
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通讯作者：
Hyunseop 현섭 Choi 최;K. Leighly;D. Terndrup;C. Dabbieri;S. Gallagher;G. Richards
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作者：
Hyunseop 현섭 Choi 최;K. Leighly;D. Terndrup;C. Dabbieri;S. Gallagher;G. Richards
我们首次使用 SimBAL 对 50 个低红移 (0.66 < z < 1.63) 铁低电离宽吸收线类星体 (FeLoBALQ) 进行了系统研究，通过详细的吸收线光谱分析，FeLoBALQ 的数量增加了五倍以上。我们发现流出物具有广泛的电离参数 −4≲logU≲1.2 和密度 2.8≲logn≲8[cm−3] 。我们样本中的物体显示 FeLoBAL 气体位于 0≲logR≲4.4 [pc] 的较宽距离范围内，尽管我们在样本中没有发现任何盘风的证据（R ≪ 0.01 pc）。流出强度主要取决于流出速度，在发光类星体或具有平坦或较红光谱能量分布的类星体中发现流出速度较快。我们发现样本中大约 18% 的 FeLoBALQ 具有类星体反馈所需的非常强大的流出。八个物体在光谱中显示出重叠的波谷，我们识别出十一个徘徊的流出物体，一类新的 FeLoBALQ，其特征是流出速度低和位于中央发动机 logR≲1 [pc] 处的高柱密度风。徘徊流出物体中的 FeLoBAL 没有表现出辐射驱动风的预期特性，这些物体可能代表 FeLoBALQ 中的一个独特群体。我们讨论了潜在的加速机制和 FeLoBAL 风的起源对于类星体不同位置的流出可能有何不同。
We present the first systematic study of 50 low-redshift (0.66 < z < 1.63) iron low-ionization broad absorption-line quasars (FeLoBALQs) using SimBAL, which represents a more than five-fold increase in the number of FeLoBALQs with detailed absorption line spectral analyses. We found the outflows have a wide range of ionization parameters, −4≲logU≲1.2 and densities, 2.8≲logn≲8[cm−3] . The objects in our sample showed FeLoBAL gas located at a wide range of distances 0≲logR≲4.4 [pc], although we do not find any evidence for disk winds (with R ≪ 0.01 pc) in our sample. The outflow strength primarily depends on the outflow velocity with faster outflows found in quasars that are luminous or that have flat or redder spectral energy distributions. We found that ∼18% of the FeLoBALQs in the sample have the significantly powerful outflows needed for quasar feedback. Eight objects showed overlapping troughs in the spectra, and we identified eleven loitering outflow objects, a new class of FeLoBALQs that are characterized by low outflow velocities and high column density winds located logR≲1 [pc] from the central engine. The FeLoBALs in loitering outflows objects do not show properties expected for radiatively driven winds, and these objects may represent a distinct population among FeLoBALQs. We discuss how the potential acceleration mechanisms and the origins of the FeLoBAL winds may differ for outflows at different locations in quasars.