A Detailed View of the Broad-line Region in NGC 3783 from Velocity-resolved Reverberation Mapping
A Detailed View of the Broad-line Region in NGC 3783 from Velocity-resolved Reverberation Mapping
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DOI：
10.3847/1538-4357/ac19af
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发表时间：
2021-08
期刊：
影响因子：
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通讯作者：
M. Bentz;P. Williams;R. Street;C. Onken;M. Valluri;T. Treu
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作者：
M. Bentz;P. Williams;R. Street;C. Onken;M. Valluri;T. Treu
我们模拟了NGC 3783中Hβ和He ii光学宽发射线的全速度分辨混响响应，以约束低电离和高电离宽线区（BLR）的几何和运动学。我们发现它的几何形状是一个厚盘，几乎面朝上，与我们的视线倾斜0.18 °，并显示出清晰的电离分层，有一个扩展的Hβ发射区（rmedian=10.07−1.12+1.10 lt-day）和一个更紧凑的位于中心的He ii发射区（rmedian=1.33−0.42=+0.34 lt-day）。在Hβ发射区，运动学上以近圆开普勒轨道为主，但近40%的轨道是内流轨道。另一方面，更紧凑的He II发射区域似乎由外流轨道主导。黑洞的质量被限制为M BH = 2.82−0.63+1.55×107 M，这与基于平均时间延迟、线宽和标度因子的简单混响约束一致。BLR的Hβ和He ii发射区之间的运动学差异是有趣的，因为NGC 3783的电离光度最近发生了很大的变化，并有证据表明BLR结构可能因此发生变化。
We have modeled the full velocity-resolved reverberation response of the Hβ and He ii optical broad emission lines in NGC 3783 to constrain the geometry and kinematics of the low-ionization and high-ionization broad-line region (BLR). The geometry is found to be a thick disk that is nearly face-on, inclined at ∼18° to our line of sight, and exhibiting clear ionization stratification, with an extended Hβ-emitting region ( rmedian=10.07−1.12+1.10 lt-day) and a more compact and centrally located He ii-emitting region ( rmedian=1.33−0.42=+0.34 lt-day). In the Hβ-emitting region, the kinematics are dominated by near-circular Keplerian orbits, but with ∼40% of the orbits inflowing. The more compact He ii-emitting region, on the other hand, appears to be dominated by outflowing orbits. The black hole mass is constrained to be M BH = 2.82−0.63+1.55×107 M ⊙, which is consistent with the simple reverberation constraint on the mass based on a mean time delay, line width, and scale factor of 〈f〉 = 4.82. The difference in kinematics between the Hβ- and He ii-emitting regions of the BLR is intriguing given the recent history of large changes in the ionizing luminosity of NGC 3783 and evidence for possible changes in the BLR structure as a result.