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arXiv 2206.06262astro-ph.HE
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由于颜色校正、吸积盘截断和吸积盘风,对估计的吸积盘大小的校正

Corrections to Estimated Accretion Disk Size due to Color Correction, Disk Truncation and Disk Wind

Andrzej A. Zdziarski, Bei You, Michal Szanecki

摘要:

我们考虑三个修正的磁盘大小估计在一个给定的频率使用吸积模型。它们是由于颜色校正,一个磁盘截断在一个内半径大于最里面的稳定的圆形轨道,和磁盘风,我们适用于标准磁盘模型。我们将我们的研究结果的基础上微透镜的磁盘大小的估计。我们发现这三种效应相结合可以解释长期存在的问题,即微透镜引起的圆盘尺寸大于使用标准圆盘模型估计的尺寸(即,不考虑上述影响)。特别地,随着温度的增加而增加的颜色校正可以导致半光半径的强烈增加,即使该校正在对应于观察到的频率的温度下接近于1。我们提出的计算半光半径的形式主义也解决了长期存在的问题的磁盘大小的估计吸积率和观测到的流量之间的差异。

英文摘要:

We consider three corrections to the disk sizes estimated at a given frequency using accretion models. They are due to a color correction, a disk truncation at an inner radius larger than the innermost stable circular orbit, and disk winds, which we apply to the standard disk model. We apply our results to the estimates of the disk sizes based on microlensing. We find these three effects combined can explain the long-standing problem of the disk sizes from microlensing being larger than those estimated using the standard disk model (i.e., that without accounting for the above effects). In particular, an increase of the color correction with the increasing temperature can lead to a strong increase of the half-light radius even if this correction is close to unity at the temperature corresponding to an observed frequency. Our proposed formalism for calculating the half-light radius also resolves the long-standing issue of discrepancies between the disk size estimates based on the accretion rate and on the observed flux.

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