The SDSS-V Black Hole Mapper Reverberation Mapping Project: Unusual Broad-line Variability in a Luminous Quasar-猫眼课题宝

DOI：

10.3847/1538-4357/acbfb7

发表时间：

2023-01

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

Logan B. Fries;J. Trump;M. Davis;C. Grier;Yue Shen;S. Anderson;T. Dwelly;M. Eracleous;Y. Homayouni;K. Horne;M. Krumpe;S. Morrison;J. Runnoe;B. Trakhtenbrot;R. Assef;W. Brandt;J. Brownstein;C. Dabbieri;A. Fix;Gloria Fonseca Alvarez;S. Frederick;P. Hall;A. Koekemoer;J. I. Li;Xin Liu;M. Martínez–Aldama;C. Ricci;D. Schneider;Hugh W. Sharp;M. Temple;Qian Yang;Grisha Zeltyn;D. Bizyaev

我们给出了发光类星体(λLλ(5100ä)=4.7×1044erg S−1)的光谱中三条宽发射线(MG II，H BAX和H GRU)戏剧性变化的高阶多历元分析，其中SDSSJ141041.25+531849.0在z=0.359，在九年的监测(2013年-2022年)中有127个光谱历元。我们观察到所有三条发射线的宽发射线宽度与通量之间的反相关关系，表明所有三条宽发射线都响应随机的连续变化而“呼吸”。我们还在所有三条宽阔的发射线上观测到了显著的径向速度变化，范围从Δv∼400公里S−1到∼800公里S−1，在监测期间发生了变化。我们倾向于对宽线变化的解释是宽线区域气体中复杂的运动学。我们建议了一个宽线变化的模型，该模型包括具有径向梯度的气体流入、方位不对称(例如热点)、叠加在随机通量驱动的最佳发射区变化上的组合(“线呼吸”)。由于类星体周围复杂的气体运动学而产生的类似的线型可变性，很可能是径向速度搜索双星黑洞时误报的一个重要来源，而双星黑洞通常缺乏我们在这里分析的那种高节奏数据。SDSS-V BHM-RM的长时间、宽视场和多历元光谱监测为确定和描述发光类星体的广泛发射线可变性和推断的内部气体环境的性质提供了一个极好的机会。

We present a high-cadence multiepoch analysis of dramatic variability of three broad emission lines (Mg ii, Hβ, and Hα) in the spectra of the luminous quasar (λ L λ (5100 Å) = 4.7 × 1044 erg s−1) SDSS J141041.25+531849.0 at z = 0.359 with 127 spectroscopic epochs over nine years of monitoring (2013–2022). We observe anticorrelations between the broad emission-line widths and flux in all three emission lines, indicating that all three broad emission lines “breathe” in response to stochastic continuum variations. We also observe dramatic radial velocity shifts in all three broad emission lines, ranging from Δv ∼ 400 km s−1 to ∼800 km s−1, that vary over the course of the monitoring period. Our preferred explanation for the broad-line variability is complex kinematics in the gas in the broad-line region. We suggest a model for the broad-line variability that includes a combination of gas inflow with a radial gradient, an azimuthal asymmetry (e.g., a hot spot), superimposed on the stochastic flux-driven changes to the optimal emission region (“line breathing”). Similar instances of line-profile variability due to complex gas kinematics around quasars are likely to represent an important source of false positives in radial velocity searches for binary black holes, which typically lack the kind of high-cadence data we analyze here. The long-duration, wide-field, and many-epoch spectroscopic monitoring of SDSS-V BHM-RM provides an excellent opportunity for identifying and characterizing broad emission-line variability, and the inferred nature of the inner gas environment, of luminous quasars.

The SDSS-V Black Hole Mapper Reverberation Mapping Project: Unusual Broad-line Variability in a Luminous Quasar

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