用光学偏振测量揭示“变化外观”类星体光谱变化背后的物理学
Unveiling the physics behind the spectral variations of "changing-look" quasars with optical polarimetry
摘要：
少数活动星系核（AGN）在相隔数年的时期之间的光学波段表现出强烈的光谱变化。光谱中宽发射线的出现或消失完全改变了它们的分类。由于它们的原子核方向不能在如此短的时间尺度内改变另一种物理解释必须found.Several方案正在竞争，以解释其变化的外观性质，并为第一次，我们进行偏振辐射转移蒙特卡罗模拟的所有模型。我们证明，所有的解释都有独特的功能，在总的光通量和连续偏振，如提出的Hutsemekers和合作者。因此，区分不同的情况是很简单的。我们将我们的结果应用于外观变化的类星体J1011+5442，并证实了Hutsemekers和合作者发现的结论：在这种特定情况下，宽发射线的消失是由于吸积率的变化。
英文摘要：
A handful of active galactic nuclei (AGN) have shown strong spectral variations in the optical band between epochs that are years apart. The appearance or disappearance of broad emission lines in their spectra completely changes their classification. Since their nucleus orientation cannot change in such short timescales another physical interpretation has to be found. Several scenarios are competing to explain their changing-look nature and, for the first time, we conduct polarized radiative transfer Monte Carlo simulations for all the models. We demonstrate that all interpretations have distinctive features in both total optical flux and continuum polarization such as proposed by Hutsemékers and collaborators. Distinguishing between the different scenarios is thus straightforward. We apply our results on the changing-look quasar J1011+5442 and confirm the conclusions found by Hutsemékers and collaborators: in this specific case, the disappearance of the broad emission lines is due to a change in accretion rate.
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