Confronting a Thin Disk-wind Launching Mechanism of Broad-line Emission in Active Galactic Nuclei with GRAVITY Observations of Quasar 3C 273
Confronting a Thin Disk-wind Launching Mechanism of Broad-line Emission in Active Galactic Nuclei with GRAVITY Observations of Quasar 3C 273
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DOI：
10.3847/1538-4357/ace4bb
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发表时间：
2023-07
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影响因子：
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通讯作者：
Kirk Long;J. Dexter;Yixian Cao;R. Davies;F. Eisenhauer;D. Lutz;D. Santos;J. Shangguan;T. Shimizu;E. Sturm
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作者：
Kirk Long;J. Dexter;Yixian Cao;R. Davies;F. Eisenhauer;D. Lutz;D. Santos;J. Shangguan;T. Shimizu;E. Sturm
类星体显示出惊人的原子发射线加宽程度，这是一种观测特征，与原子核发射的径向距离估计相结合，经常被用来推断中心超大质量黑洞的质量。半径估计取决于这个所谓的宽线区域的结构和运动学，该区域通常被建模为一组离散的发射云。在这里，我们测试了在超大质量黑洞周围的开普勒式旋转下，来自几何薄吸积盘的光学厚线发射的另一种运动圆盘-风模型。我们使用这个模型来计算宽的发射线轮廓和干涉相位，以与重力数据和以前发表的云模拟结果进行比较。虽然我们表明这样的模型可以提供一个统计上令人满意的拟合类星体3C273的重力数据，但我们不赞成它，因为它要求在高倾角观测3C273，而射电喷流方向的观测不支持这一点。
Quasars show a remarkable degree of atomic emission-line broadening, an observational feature which, in conjunction with a radial distance estimate for this emission from the nucleus, is often used to infer the mass of the central supermassive black hole. The radius estimate depends on the structure and kinematics of this so-called broad-line region, which is often modeled as a set of discrete emitting clouds. Here, we test an alternative kinematic disk-wind model of optically thick line emission originating from a geometrically thin accretion disk under Keplerian rotation around a supermassive black hole. We use this model to calculate broad emission-line profiles and interferometric phases to compare to GRAVITY data and previously published cloud modeling results. While we show that such a model can provide a statistically satisfactory fit to GRAVITY data for quasar 3C 273, we disfavor it as it requires 3C 273 be observed at high inclination, which observations of the radio jet orientation do not support.