A Microlensing Accretion Disk Size Measurement in the Lensed Quasar WFI 2026–4536
A Microlensing Accretion Disk Size Measurement in the Lensed Quasar WFI 2026–4536
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DOI：
10.3847/1538-4357/ab557a
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发表时间：
2019-11
期刊：
影响因子：
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通讯作者：
M. Cornachione;C. Morgan;M. Millon;M. Bentz;F. Courbin;V. Bonvin;E. Falco
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文献类型：
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作者：
M. Cornachione;C. Morgan;M. Millon;M. Bentz;F. Courbin;V. Bonvin;E. Falco
我们使用13个季节的R波段测光从1.2米伦纳德欧拉瑞士望远镜在拉西拉检查微透镜的变化在四重成像透镜类星体WFI 2026-4536。光变曲线在所有历元中表现出0.02等的不相关变化，在一个季节中表现出0.01等的突出特征。我们分析这种变化，以限制类星体的吸积盘的大小。采用60°的名义倾角，在静止坐标系波长为2043 nm处，我们得到吸积盘尺度半径为，并根据VLT谱中的Civ线估计黑洞质量为.这种尺寸测量与类星体吸积盘尺寸-黑洞质量关系完全一致，提供了另一个系统，其中吸积盘比薄盘理论预测的要大。
We use 13 seasons of R-band photometry from the 1.2 m Leonard Euler Swiss Telescope at La Silla to examine microlensing variability in the quadruply imaged lensed quasar WFI 2026–4536. The lightcurves exhibit ∼0.2 mag of uncorrelated variability across all epochs and a prominent single feature of ∼0.1 mag within a single season. We analyze this variability to constrain the size of the quasar’s accretion disk. Adopting a nominal inclination of 60°, we find an accretion disk scale radius of at a rest-frame wavelength of 2043 Å, and we estimate a black hole mass of , based on the C iv line in VLT spectra. This size measurement is fully consistent with the quasar accretion disk size—black hole mass relation, providing another system in which the accretion disk is larger than predicted by thin-disk theory.