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arXiv 1204.4480astro-ph.COastro-ph.HE
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用能量相关的X射线微透镜揭示吸积盘的结构

Revealing the Structure of an Accretion Disk Through Energy Dependent X-ray Microlensing

G. Chartas, C. S. Kochanek, X. Dai, D. Moore, A. M. Mosquera, J. A. Blackburne

摘要:

我们目前的监测观测结果的引力透镜类星体RX J1131-1231与钱德拉X射线天文台进行。X射线观测计划采用相对较长的曝光时间,允许在RX J1131-1231图像的软(0.2-2 keV)和硬(2-10 keV)光变曲线中搜索能量依赖性微透镜。我们在图像A和D的X射线光变曲线中检测到显著的微透镜,并且在图像D中检测到能量依赖的微透镜。当图像D变得更放大时,软带的放大率似乎比硬带中的放大率大约1.3倍。这可以解释为一个紧凑的,更软的光谱电晕之间的差异,这是产生一个更广泛的,更硬的光谱反射组件的磁盘。图像D中的荧光铁线在光变曲线的三个连续时间平均相位上的演变支持了这一点。在第一个周期中,在E = 6.36(-0.16,+0.13)keV处检测到Fe线(> 99%置信度)。在第二个周期中,检测到两条Fe线,一条在E = 5.47处(-0.08,+0.06)keV(在> 99%置信度下检测到)和另一个在E = 6.02(-0.07,+0.09)keV(在> 90%置信度下勉强检测到),并且在第三周期中,在6.42(-0.15,+0.19)keV处检测到加宽的Fe线(在> 99%置信度下)。微透镜事件期间Fe线轮廓的这种演变与当焦散线穿过内部盘时预期的线失真一致,其中荧光Fe线的形状被广义相对论和多普勒效应扭曲。

英文摘要:

We present results from monitoring observations of the gravitationally lensed quasar RX J1131-1231 performed with the Chandra X-ray Observatory. The X-ray observations were planned with relatively long exposures that allowed a search for energy-dependent microlensing in the soft (0.2-2 keV) and hard (2-10 keV) light curves of the images of RX J1131-1231. We detect significant microlensing in the X-ray light-curves of images A and D, and energy-dependent microlensing of image D. The magnification of the soft band appears to be larger than that in the hard band by a factor of ~ 1.3 when image D becomes more magnified. This can be explained by the difference between a compact, softer-spectrum corona that is producing a more extended, harder spectrum reflection component off the disk. This is supported by the evolution of the fluorescent iron line in image D over three consecutive time-averaged phases of the light curve. In the first period, a Fe line at E = 6.36(-0.16,+0.13) keV is detected (at > 99% confidence). In the second period, two Fe lines are detected, one at E = 5.47(-0.08,+0.06) keV (detected at > 99% confidence) and another at E = 6.02(-0.07,+0.09) keV (marginally detected at > 90% confidence), and in the third period, a broadened Fe line at 6.42(-0.15,+0.19) keV is detected (at > 99% confidence). This evolution of the Fe line profile during the microlensing event is consistent with the line distortion expected when a caustic passes over the inner disk where the shape of the fluorescent Fe line is distorted by General Relativistic and Doppler effects.

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