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arXiv 1202.4692astro-ph.HE
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一个显著的长期光变曲线和深的低态光谱学:对NLS1星系Mkn 335的Swift & XMM-牛顿监测

A remarkable long-term light curve, and deep, low-state spectroscopy: Swift & XMM-Newton monitoring of the NLS1 galaxy Mkn 335

D. Grupe, S. Komossa, L. C. Gallo, A. L. Longinotti, A. C. Fabian, A. K. Pradhan, M. Gruberbauer, D. Xu

摘要:

窄线塞弗特1星系(NLS 1)Mkn 335是值得注意的,因为它多次显示出深,长X射线低态,显示出明显的光谱结构。它已成为深最小X射线态活动星系核的原型之一。在这里,我们报告继续我们正在进行的监测活动与雨燕和检查的基础上,2009年6月的200 KS触发观测与XMM的低状态X射线光谱。自2007年5月以来,斯威夫特一直在持续监测MKN 335,通常是每月一次。这是迄今为止获得的活动星系核(AGN)最长的同时UV/X射线光变曲线之一。即使在数小时的时间尺度上,Mkn 335也表现出强烈的X射线变异性。在紫外线下,它是NLS 1中变化最大的一种。Swift的长期监测使我们能够检查紫外线、X射线和X射线硬度比之间的相关性。我们没有发现显着的相关性或滞后之间的UV和X-射线的变化,但是,我们确实发现不同的趋势的行为的硬度比的变化。硬度比和计数率在低通量状态下相关,但在高通量状态下没有相关性。2007年和2009年XMM观测的X射线低态光谱显示出显着的光谱变化。为了表征数据,我们用一套唯象模型拟合X射线光谱。用部分吸收模型和模糊反射模型可以很好地拟合宽波段CCD光谱。这些更复杂的模型将在接下来的工作中进一步详细探讨。

英文摘要:

The Narrow-line Seyfert 1 galaxy (NLS1) Mkn 335 is remarkable because it has repeatedly shown deep, long X-ray low-states which show pronounced spectral structure. It has become one of the prototype AGN in deep minimum X-ray states. Here we report on the continuation of our ongoing monitoring campaign with Swift and the examination of the low state X-ray spectra based on a 200 ks triggered observation with XMM in June 2009. Swift has continuously monitored Mkn 335 since May 2007 typically on a monthly basis. This is one of the longest simultaneous UV/X-ray light curves so far obtained for an active galactic nucleus (AGN). Mkn 335 has shown strong X-ray variability even on time scales of hours. In the UV, it turns out to be one of the most variable among NLS1s. Long-term Swift monitoring allow us to examine correlations between the UV, X-rays and X-ray hardness ratios. We find no significant correlation or lag between the UV and X-ray variability; however, we do find distinct trends in the behavior of the hardness ratio variability. The hardness ratio and count rate are correlated in the low-flux state, but no correlation is seen in the high-state. The X-ray low-state spectra of the 2007 and 2009 XMM observations display significant spectral variability. We fit the X-ray spectra with a suite of phenomenological models in order to characterize the data. The broad band CCD spectrum can be fitted equally well with partial absorption and blurred reflection models. These more complicated models are explored in further detail in upcoming work.

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