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arXiv 2004.03957astro-ph.GAastro-ph.HE
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活动星系核的连续极化混响映射

Continuum polarization reverberation mapping of AGNs

P. A. Rojas Lobos, R. W. Goosmann, J. M. Hameury, F. Marin

摘要:

确定活动星系核宽线区(BLR)的大小和几何形状是确定吸积黑洞质量的主要内容之一。这可以通过确定光学连续谱和由BLR再处理的通量之间的延迟来完成,特别是经由发射线。我们建议在这里,偏振光和非偏振光之间的延迟也可以用在几乎相同的方式来约束的大小的最大反射率,我们检查,可以预期使用这种技术的观测有意义的结果。我们使用我们的程序STOKES进行偏振辐射转移模拟。我们确定的中心源环境(宽线区,尘埃环,极地风)的波动的中心源是随机产生的响应,然后我们计算模拟的偏振通量和总通量之间的互相关估计的时间延迟,将提供使用相同的方法由观测。我们发现,宽线区域是偏振通量和总通量之间的延迟的主要贡献者,这种延迟是独立的观测波长。这验证了在光学/紫外波段使用偏振辐射来估计宽线区域的几何特性在I型活动星系核,其中的视角是接近极上和BLR是不被尘埃环面掩盖。

英文摘要:

The determination of the size and geometry of the broad line region (BLR) in active galactic nuclei is one of the major ingredients for determining the mass of the accreting black hole. This can be done by determining the delay between the optical continuum and the flux reprocessed by the BLR, in particular via the emission lines. We propose here that the delay between polarized and unpolarized light can also be used in much the same way to constrain the size of the BLR; we check that meaningful results can be expected from observations using this technique. We use our code STOKES for performing polarized radiative transfer simulations. We determine the response of the central source environment (broad line region, dust torus, polar wind) to fluctuations of the central source that are randomly generated; we then calculate the cross correlation between the simulated polarized flux and the total flux to estimate the time delay that would be provided by observations using the same method. We find that the broad line region is the main contributor to the delay between the polarized flux and the total flux; this delay is independent on the observation wavelength. This validates the use of polarized radiation in the optical/UV band to estimate the geometrical properties of the broad line region in type I AGNs, in which the viewing angle is close to pole-on and the BLR is not obscured by the dust torus.

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