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THE FAST UV VARIABILITY OF THE ACTIVE GALACTIC NUCLEUS IN FAIRALL 9

机译:9号展厅中活动银河系核的快速紫外线变异性

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We present the results from a new optical/UV/X-ray monitoring campaign of the luminous Seyfert galaxy Fairall 9 using the Swift satellite. Using the UV-Optical Telescope on Swift, we find correlated optical/UV variability on all timescales ranging from the sampling time (4?days) to the length of the campaign (2.5?months). In one noteworthy event, the UW2-band flux dips by 20% in four?days, and then recovers equally quickly; this event is not seen in either the optical or the X-ray bands. We argue that this event provides further evidence that a significant fraction of the UV-emission must be driven by irradiation/reprocessing of emission from the central disk. We also use an archival XMM-Newton observation to examine shorter timescale UV/X-ray variability. We find very rapid (10?ks) UV flares of small amplitude. We show that, unless this emission is non-thermal, we must be seeing the Wien tail from a compact (3 light hours), hot (T 8 × 104?K) region. The possible association with X- ray microflares suggests that we may be seeing the UV signatures of direct X-ray flare heating of the innermost disk.
机译:我们介绍了使用Swift卫星对发光的塞弗特星系Fairall 9进行的新的光学/ UV / X射线监视活动的结果。使用Swift上的UV-Optical Telescope,我们发现在所有时间范围内,从采样时间(4天)到活动持续时间(2.5月),相关的光学/ UV变异性。值得一提的是,UW2波段通量在四天内下降了20%,然后恢复得很快。在光学或X射线波段均看不到此事件。我们认为,该事件提供了进一步的证据,表明紫外线的很大一部分必须由中央圆盘的辐射/后处理来驱动。我们还使用档案XMM-牛顿观测来检查较短的时间尺度UV / X射线变异性。我们发现非常小幅度的快速(<10?ks)UV耀斑。我们证明,除非这种排放是非热的,否则我们必须从紧凑的(<3个光小时)热的(T> 8×104?K)区域看到维恩尾巴。与X射线微耀斑的可能关联表明,我们可能正在看到最内层磁盘直接X射线耀斑加热的紫外线特征。

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