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arXiv 1010.3744astro-ph.HEastro-ph.CO
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了解1H 0707 -495中的混响滞后

Understanding Reverberation Lags in 1H0707-495

A. Zoghbi, P. Uttley, A. C. Fabian

摘要:

最近在NLS 1星系1H 0707 -495中发现了来自超大质量黑洞附近的第一个反射滞后。我们将这种滞后解释为来自黑洞附近物质的反射,这些物质在事件视界(一个内部反射器)的几个引力半径内。后来米勒等人声称,这种滞后可以由更远的物质产生,在数百个引力半径处(一个外部反射器)。在这里,我们批判性地探讨他们对滞后的解释。详细的软,硬能带之间的时间滞后的能量依赖性是很好的建模内反射器使用我们以前发表的光谱模型。Miller等人通过忽略软带中的黑体分量得到了相反的主张。如果满足几个难以置信的条件,大规模的外反射器可以产生软滞后。一个额外的传递函数是需要在软带对应的一个区域,是物理上接近的连续源,或接近我们的视线和对着一个小的立体角在源,挑战生产的观察到的光谱。我们发现,原来的内部反射器的混响非常接近的黑洞的解释提供了一个自洽的和强大的模型,解释的能量谱和定时特性,包括时间延迟,功率谱和形状的相干函数。其中一些性质与简单的大尺度外反射模型的预测相反。

英文摘要:

The first reverberation lag from the vicinity of a supermassive black hole was recently detected in the NLS1 galaxy 1H0707-495. We interpreted the lag as being due to reflection from matter close to the black hole, within a few gravitational radii of the event horizon (an inner reflector). It has since been claimed by Miller et al that the lag can be produced by more distant matter, at hundreds of gravitational radii (an outer reflector). Here, we critically explore their interpretation of the lag. The detailed energy dependence of the time lags between soft and hard energy bands is well modelled by an inner reflector using our previously published spectral model. A contrary claim by Miller et al was obtained by neglecting the blackbody component in the soft band. Soft lags can be produced by a large-scale outer reflector if several, implausible, conditions are met. An additional transfer function is required in the soft band corresponding to a region that is physically close to the continuum source, or lies close to our line of sight and subtends a small solid angle at the source, challenging the production of the observed spectrum. We show that the original inner reflector interpretation of reverberation very close to the black hole provides a self-consistent and robust model which explains the energy spectrum and timing properties, including the time delays, power spectra and the shape of the coherence function. Several of these properties are opposite to the predictions from a simple large-scale outer reflection model.

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