Accretion Disk Size Measurement and Time Delays in the Lensed Quasar WFI 2033–4723
Accretion Disk Size Measurement and Time Delays in the Lensed Quasar WFI 2033–4723
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DOI：
10.3847/1538-4357/aaed3e
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
C. Morgan;Gregory E. Hyer;V. Bonvin;A. Mosquera;M. Cornachione;F. Courbin;C. Kochanek;E. Falco
中科院分区：
文献类型：
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作者：
C. Morgan;Gregory E. Hyer;V. Bonvin;A. Mosquera;M. Cornachione;F. Courbin;C. Kochanek;E. Falco
我们展示了来自 CTIO 的 1.3 m SMARTS 望远镜和 La Silla 的 1.2 m 欧拉瑞士望远镜对四透镜类星体 WFI 2033-4723 的 13 个季节的 R 波段光度测量，其中我们在~6 年的时间尺度上检测到~0.2 mag 的微透镜变化。使用贝叶斯蒙特卡罗技术，我们分析微透镜信号，以获得该系统吸积盘尺寸的测量值，即 λrest = 2481 Å（假设倾角为 60°）。我们确认了先前对 BC 和 AB 时间延迟的测量，并且获得了对间隔很近的 A1 和 A2 图像之间的延迟的初步测量。最后，我们更新了类星体吸积盘大小与黑洞质量关系，其中我们确认简单薄盘理论预测的吸积盘大小太小。
We present 13 seasons of R-band photometry of the quadruply lensed quasar WFI 2033–4723 from the 1.3 m SMARTS telescope at CTIO and the 1.2 m Euler Swiss Telescope at La Silla, in which we detect microlensing variability of ∼0.2 mag on a timescale of ∼6 years. Using a Bayesian Monte Carlo technique, we analyze the microlensing signal to obtain a measurement of the size of this system’s accretion disk of at λrest = 2481 Å, assuming a 60° inclination angle. We confirm previous measurements of the BC and AB time delays, and we obtain a tentative measurement of the delay between the closely spaced A1 and A2 images of days. We conclude with an update to the Quasar Accretion Disk Size–Black Hole Mass Relation, in which we confirm that the accretion disk size predictions from simple thin disk theory are too small.