论文标题

IRAS 13224-3809使用XMM-Newton数据的IRA的合并计时/光谱研究

A combined timing/spectral study of IRAS 13224-3809 using XMM-Newton data

论文作者

Caballero-Garcia, M. D., Papadakis, I. E., Dovciak, M., Bursa, M., Svoboda, J., Karas, V.

论文摘要

我们介绍了IRAS 13224-3809的X射线变异性研究的结果。这可能是X射线混响研究的最佳来源,因为它是X射线明亮的,极其可变的,并且已通过XMM-Newton进行了广泛的观察。我们使用了来自三个史诗相机(增加信号到噪声)的所有档案XMM-Newton数据,并且鉴于源的许多观察结果,我们能够在三个不同的磁通水平/周期中计算时间段光谱。我们使用新的X射线回响代码同时拟合了时间延迟和能量谱,该代码将碟片的时间依赖性反射光谱作为对X射线闪光灯的响应,从位于黑洞(BH)吸积盘轴上的X射线闪光灯(灯底部的几何形状)。据我们所知,这是AGN首次在不同的通量时期同时通过模型拟合时段和能量光谱。该模型适合在Schwarzschild BH的情况下,BH快速旋转的情况下,模型明显好于模型拟合。该结果强烈利用该来源中旋转中央BH的假设。我们还检测到X射线电晕高度的显着变化。当X射线光度为1.5-3%时,X射线高度从3-5个重力半径增加,当亮度加倍时,X射线半径为1.5-3%,最高为10个引力半径。

We present the results from an X-ray variability study of IRAS 13224-3809. This is probably the best source for X-ray reverberation studies since it is X-ray bright, extremely variable, and it has been extensively observed with XMM-Newton. We used all the archival XMM-Newton data from the three EPIC cameras (to increase the signal-to-noise) and, given the many observations of the source, we were able to compute the time-lags spectra in three different flux levels/periods. We fitted the time-lags and energy spectra, simultaneously, using a new X-ray reverberation code which computes the time dependent reflection spectra of the disc as a response to an X-ray flash from a point source located on the axis of the black-hole (BH) accretion disc (lamp-post geometry). To the best of our knowledge, this is the first time for an AGN that both time-lags and energy spectra are fitted by a model simultaneously in different flux periods. The model fits in the case when the BH is rapidly rotating are significantly better than the model fits in the case of a Schwarzschild BH. This result strongly favours the hypothesis of a rotating central BH in this source. We also detect significant variations in the height of the X-ray corona. The X-ray height appears to increase from 3-5 gravitational radii when the X-ray luminosity is of the order of 1.5-3 percent of the Eddington limit, up to 10 gravitational radii, when the luminosity doubles.

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